| 1. |
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| 2. |
- Cederling, Ulf, et al.
(författare)
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A Project Management Model Based on Shared Understanding
- 2000
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Ingår i: Proceedings of the 33rd Annual Hawaii International Conference on System Sciences, 2000. - : IEEE. - 0769504930
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Konferensbidrag (refereegranskat)abstract
- Traditionally in industrial system development, the total project is decomposed into phases. The result from one phase, normally a document or a system component, is passed to the phase(s) to follow. The deliverables from the "phases" are often prescribed in standards or corporate guidelines. This metaphor, where understanding is packaged into documents, has been a cornerstone for our educational systems as well as for organizing engineering or social development projects. It is assumed that the understanding once achieved by the author(s) of the document will be transferred to its reader(s). In three longitudinal case studies of industrial development projects, a new view has evolved. The analysis team develops a capability to answer questions occurring on the fly, rather than writing down answers to initially stated issues. Our aim is to define a model based upon developing and making available shared understanding. The paper presents a survey of the case studies. In a fourth project an embryo of the new system development model is being applied and evaluated.
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| 3. |
- Cousins, Sara, et al.
(författare)
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I nattviolens hage
- 2008
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Ingår i: Olsson, R. (red), Mångfaldsmarker. - Uppsala : Centrum för biologisk mångfald. - 9789189232297 ; , s. 9-28
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- I en svensk naturbetesmark kan man hitta över 40 växtarter inom en enda kvadratmeter. Det är världsrekord. En stor del av de arter som finns i betesmarkerna förekommer inte i andra naturtyper. Idag återstår inte mer än en tiondel av den areal naturbetesmarker som fanns i Sverige för drygt 100 år sedan. Igenväxningen hotar inte bara en lång rad arter. Också stora kulturhistoriska värden och vårt vackra, variationsrika odlingslandskap står på spel. Fortsatt hävd förutsätter att det finns en levande landsbygd med bärkraftiga jordbruksföretag.
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| 4. |
- Cousins, Sara, et al.
(författare)
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I nattviolens hage
- 2008
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Ingår i: Olsson, R. (red), Mångfaldsmarker. - Uppsala : Centrum för biologisk mångfald. ; , s. 9-28
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- I en svensk naturbetesmark kan man hitta över 40 växtarter inom en enda kvadratmeter. Det är världsrekord. En stor del av de arter som finns i betesmarkerna förekommer inte i andra naturtyper. Idag återstår inte mer än en tiondel av den areal naturbetesmarker som fanns i Sverige för drygt 100 år sedan. Igenväxningen hotar inte bara en lång rad arter. Också stora kulturhistoriska värden och vårt vackra, variationsrika odlingslandskap står på spel. Fortsatt hävd förutsätter att det finns en levande landsbygd med bärkraftiga jordbruksföretag.
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| 5. |
- Crumley, Carole L., et al.
(författare)
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Is There a Future for the Past?
- 2018
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Ingår i: Issues and Concepts in Historical Ecology. - : Cambridge University Press. - 9781108420983 - 9781108355780 ; , s. 1-9
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Konferensbidrag (refereegranskat)
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| 6. |
- Ebenhard, Torbjörn, et al.
(författare)
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Lågskogsbruk – biobränsleproduktion i samklang med miljömål
- 2013
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Lågskogsbruk går ut på att återkommande hugga lövträd som slår skott från en gemensam stubb-bas eller sockel. Lågskogens två huvudtyper, skottskogar och hamlingsskogar, kan ses som halvnaturliga biotoper med lång historia och egna utvecklade organismsamhällen, däribland många naturvårdsintressanta arter, som ursprungligen levde i naturliga biotoper som inte längre existerar. Lågskogen erbjuder gamla strukturer och substrat utan att miljön blir kontinuerligt skuggig som i högskog. Det är både möjligt och önskvärt att bedriva ett modernt lågskogsbruk för biomassaproduktion, i synnerhet på marker som idag inte används för skogsbruk eller jordbruksproduktion. Vi bedömer att det finns totalt ca en halv miljon hektar av skyddade områden, restmarker i jordbrukslandskapet, ängs- och hagmarker, väg- och järnvägsområden, kraftledningsgator, samt tätortsnära parker och friluftsområden där lågskogsbruk skulle vara lämpligt. Med en produktion av 2-5 ton biomassa per hektar och år skulle detta kunna ge 10-24 MWh energi per hektar och år, sammanlagt för landet 5-12 TWh per år. Jämfört med de bästa biomassagrödorna (Salix, Miscanthus) har lågskogen inte samma potential som bränsleproducent, men den står sig väl mot raps. Lågskogen är dock mer effektiv än vanliga biomassagrödor med avseende på utsläpp av växthusgaser per producerad energienhet, snabbheten i återinlagring av kol, och gynnandet av biologisk mångfald.
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| 7. |
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| 8. |
- Eckstein, Rolf Lutz, 1965-, et al.
(författare)
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Biological flora of Central Europe– Lupinus polyphyllus Lindley
- 2023
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Ingår i: Perspectives in plant ecology, evolution and systematics. - : Elsevier. - 1433-8319 .- 1618-0437. ; 58
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Tidskriftsartikel (refereegranskat)abstract
- The invasive herb Lupinus polyphyllus has been focus of a number of fact sheets worldwide but a comprehensive summary of the species’ taxonomy and morphology, distribution, habitat requirements, and biology has been lacking. This paper gives a thorough account of the species’ systematic position and taxonomy, highlighting the difficulties to delimit taxa, which is related to interbreeding among members of this genus. However, L. polyphyllus var. polyphyllus is apparently the taxon that has naturalized and is regionally invasive in temperate-humid climates worldwide. We also present an updated distribution map of L. polyphyllus in the native and invaded ranges, which highlights seven regions in the world where the species has been established. We show that the climatic niche of L. polyphyllus in the invaded range shifts towards higher summer precipitation and lower isothermality, probably because the invaded range includes subcontinental regions of eastern Europe and western Siberia. The habitats of L. polyphyllus range from rather dry to wet, have moderately acidic to strongly acidic soils, and the species’ indicator values across Europe suggest that it occurs along a gradient from very nutrient poor sites to intermediate to rich sites from northern to southern Europe. The species shows high resistance to both drought and frost. In Central Europe, the species has a stronghold in alpic mountain hay meadows, abandoned meadows and pastures, low and medium altitude hay meadows, anthropogenic herb stands and temperate thickets and scrubs. In northern Europe, the species occurs in anthropogenic herb stands along roads and railroads as well as in abandoned pastures and fields. We also found some doubtful information about L. polyphyllus in the literature. This refers to its description as “rhizomatous perennial” although it lacks rhizomes; an apparently very high longevity of its seeds, which may only be true under artificial conditions in an ex situ seed repository; and a very deep rooting depth, which may not represent the average rooting depth but rather an extreme value. Knowledge about the interrelationships between the species’ future population dynamics and spread and ongoing climate warming is lacking. Finally, our review points out that there is currently no evidence-based strategy for a cost-efficient management of L. polyphyllus although it is among the most problematic non-native plant species in Europe due to its environmental and socio-economic impacts.
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| 9. |
- Eriksson, Ove, 1956-, et al.
(författare)
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Concepts for Integrated Research in Historical Ecology
- 2018
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Ingår i: Issues and Concepts in Historical Ecology: ThePast and Future of Landscapes and regions. - Cambridge : Cambridge University Press. - 9781108420983 - 9781108355780 ; , s. 145-181
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Bokkapitel (refereegranskat)
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| 10. |
- Eriksson, Ove, et al.
(författare)
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Historic hay cutting dates from Sweden 1873-1951 and their implications for conservation management of species-rich meadows
- 2015
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Ingår i: Biological Conservation. - : Elsevier BV. - 0006-3207 .- 1873-2917. ; 184, s. 100-107
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Tidskriftsartikel (refereegranskat)abstract
- Semi-natural hay meadows are species rich habitats, formed by a long history of management and they have experienced a drastic decline all over Europe. There is a vast literature on conservation and species diversity of semi-natural hay-meadows, but very limited information on historic timing of hay cutting. We analyzed data collected between 1873 and 1951 on hay cutting dates and phenology of six plant species from farms distributed across Sweden. The data set comprised 16,015 observations from 175 sites. Results show that date of start and end of hay cutting varied across Sweden. The start of hay cutting was generally delayed by 2.2 days per latitudinal degree and 1.5 days per 100 m altitude, while the end of hay cutting was generally delayed by 2.9 days per latitudinal degree and 2.5 days per 100 m altitude. The average hay cutting period was 18.5 +/- 6.6 days, and became slightly shorter northwards. Site-specific factors had a great impact on when hay cutting was performed, as indicated by a significant correlation between flowering (and leafing) phenology in other species and start date of hay cutting. Today, management for conservation is usually related to a calendar date (e.g. regulated in eligibility criteria and requirements for payment in agri-environment programs in EU). In order to mimic historic management that formed this habitat, management should instead account for latitude and altitude, between-year variation in timing of hay cutting, variation in both start and end dates of hay cutting and if possible local phenological conditions.
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| 11. |
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| 12. |
- Gerhardt, Karin, et al.
(författare)
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Kunskapssammanställning
- 2018
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Ingår i: Övergångszoner mellan skogsoch jordbruksmark : ett samverkansprojekt inom miljömålsrådet 2017. ; :2018:14, s. 55-85
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 13. |
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| 14. |
- Gustavsson, Eva, 1970, et al.
(författare)
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Land use more than 200 years ago explains current grassland plant diversity in a Swedish agricultural landscape
- 2007
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Ingår i: Biological Conservation. - : Elsevier BV. - 0006-3207. ; 138, s. 47-59
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Tidskriftsartikel (refereegranskat)abstract
- The reformation of the Swedish agricultural system, about 150 years ago, drastically changed the use of semi-natural grasslands. Grassland plant diversity has declined due to abandonment, changed management methods and production intensification. Current diversity patterns are thus a result of historical and current land use in combination. In this study we investigate the relative importance of historical grassland management and current land use for grassland plant diversity. The distribution of 128 grassland plant species in an agricultural landscape in southwest Sweden was analysed in relation to current land use and land use in three historical time periods; the 18th and the 19th century and around 1960. Land use during the three historical periods was also combined into land-use sequences. Four diversity estimates were used: number of grassland species, number of grassland specialists, Shannon-Wiener index on the specialists and total cover/hectare of specialists. Historical land use - especially 18th century and the land-use sequences - explained more of the variation among study sites than did current land use. Continuity of a specific management type was important for grassland plants as indicated by highest diversities being found in pastures continuously grazed since the 18th century. Former hay meadows, currently grazed, did not differ in any diversity estimate from abandoned hay meadows, indicating that change of management from mowing to grazing a century ago may cause diversity declines similar to abandonment some 40 years ago. Limited artificial fertilisation in the managed areas may have contributed to this effect. Further decline in grassland biodiversity in the agricultural landscape is expected because a substantial proportion of grassland plant populations occur in abandoned areas. © 2007 Elsevier Ltd. All rights reserved.
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| 15. |
- Helldin, Jan Olof, et al.
(författare)
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Abundance of red-listed species in infrastructure habitats - "responsibility species" as a priority-setting tool for transportation agencies' conservation action
- 2015
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Ingår i: Nature Conservation. - : Pensoft Publishers. - 1314-6947 .- 1314-3301. ; , s. 143-158
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Tidskriftsartikel (refereegranskat)abstract
- Road and railroad verges may contribute to nature conservation by providing habitat for many species, but due to limited resources, there is a need to select the most important road and railroad stretches for adapted management. We explore the responsibility species concept as a tool for the Swedish Transport Administration to make this selection. We propose lists of candidate responsibility species based on relative abundance of conservation priority species in the vicinity of roads and railroads, respectively. Abundance data were derived from crowd-sourced species observations. Species with >= 20% of observations in infrastructure habitats were included as candidate responsibility species. For roads 32 species were included in the list, for railroads seven species, with an overlap of three species between the lists. We analyzed habitat and management requirements of the listed species to try identifying functional groups. Most of the species require open or semi-open habitats, mainly dry grassland or heathland on sandy or limy soil, un-sprayed crop fields, or solitary trees. Host plants or substrates include broom (genus Genista), patches of bare soil, and sun exposed wood. Conservation actions prescribed for the species include, e.g., late or irregular mowing, removal of the field layer, planting of host species, protecting and providing particular substrates, and special protection of certain sites. We argue that road and railroad managers are particularly well suited to conduct most of these actions. We consider the responsibility species concept to be a useful tool for transportation agencies to set priorities for adapted verge management, and the current method to be effective in identifying a first list of candidate species. We discuss the possibility of also identifying responsibility habitats or general management measures based on the results.
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| 16. |
- Helldin, Jan Olof, et al.
(författare)
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Biodiversitet i jernbanehabitater – biologisk kulturarv og grøn infrastruktur
- 2019
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Ingår i: Jernbanehistorie. - 2245-9499 .- 2446-323X. ; 7, s. 7-35
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Tidskriftsartikel (refereegranskat)abstract
- The railway network with associated train traffic has a number of well described negative effects on biodiversity, for example loss of natural habitat, barrier and mortality effects, noise disturbance, changes in hydrology, and an increasing fragmentation. However, railway areas such as rail yards, embankments and verges may also provide habitat for many plant and animal species, some of which are rare and endangered while others are invasive aliens. The importance of railway habitats for plant and animal conservation has been acknowledged rather recently, and there are yet much to learn about the ecology of these areas, including their history, ecological functions, and the threats to, prospects for, and management of species of particular importance. The aim of this article is to give an overview of the diversity of species and habitats in Swedish railway areas, suggest a conceptual theory of how these species link to the pre-industrial landscape, describe current goals for and management of railway habitats, and point out the need for future research in the field.Many railway areas in Sweden are characterized by a small-scale habitat mosaic, including micro niches, where species of plants, insects and other invertebrates thrive. Sandy soils and regular vegetation management create dry and sun-exposed “mini steppes” favoring low-growth plants and specialized insects that otherwise have problems surviving in the modern landscape. Frequent disturbances to the ground and soil, caused by a range of human activities, result in ruderal habitats, not least in stations and rail yards where vegetation can be found in various early successional stages. Stands of flowering plants such as blueweed, bluebells, legumes and hawkweeds constitute nectar and pollen resources and host plants for a range of beetles, bees, bugs and butterflies. Patches of bare soil create habitat for nest digging bees and groundliving carabid beetles. Objects such as solitary trees or rose shrubs, stone walls, older wood constructions and wood piles provide substrate for many lichen and insect species and may therefore also be of conservation value. Seeds and invertebrates dispersing along railway verges and hitch-hiking with vehicles further contribute to the variety of species.During assessments of species (selected taxa) and habitats in 747 Swedish rail yards and stations in 2008-2018, a total of ca 2,700 species were recorded, of which 123 species are red-listed. Some 40% of the recorded species could be labelled railway associated, meaning that they significantly benefit from and contribute to the railway habitats, but are also found in similar habitats elsewhere in the landscape. Some 3% of the species are railway bound, meaning that they depend on railway habitats and are largely lacking in other areas. A total of 237 of the rail yards and stations were classified as species rich, i.e. with records of species of particular importance or with the right conditions for such species. This classification can serve to point out railway areas for special conservation action.Species favored by dry and warm conditions (referred to as xerotermophilic) can be assumed to have evolved in natural steppe or ruderal grassland. Such species found new niches and spread to new areas in the historical agricultural landscape. In Sweden before industrialization, the agricultural landscape was dominated by grasslands required to feed large stocks of domestic animals, many forests were sparse and semi-open, soils were emaciated, and frequent human and livestock activities in the landscape such as trampling, digging, cutting etc. mimicked natural disturbance regimes. With the industrialization, in the late 19th and early 20th century, the landscape started undergoing large changes and the conditions diminished for the many species linked to open, dry grasslands. However, in the same period the national railway network was established, and many of the species found recourse in railway areas, which again provided conditions resembling natural habitats and ecological processes. The railway network reached through a landscape of grasslands, villages and farms, and species could easily spread into their new habitats. While sparse and sometimes declining, the xerothermophilic species and the sandy, ruderal grasslands found in railway areas could be considered a biological heritage from the pre-industrial landscape. Still today the railway verges may serve as ecological corridors that functionally connect remnant habitats. Railway areas provide a combination of ancient and new conditions for biodiversity and may form an ecological bridge in both time and space -- thereby being part of the landscape´s green infrastructure.The Swedish Transport Administration, the authority in charge of the management of railway areas, currently acknowledges the significance of species conservation in railway habitats, and state in their regulatory documents that species rich railway habitats should be maintained and if possible created, in order to strengthen the green infrastructure and to avoid habitat loss. Efforts are made to adapt the current railway maintenance, to build knowledge, and enable research and experimental management, to reach this goal.Possible adaptations of regular vegetation maintenance in railway areas may include i) postponed vegetation cutting, ii) cutting targeted to certain areas, iii) control of alien invasive species, iv) removal of cutting mulch, v) controlled burning and iv) livestock grazing. Other examples of management actions to benefit species conservation in railway areas are i) ground scarification, ii) providing open sand, iii) uprooting of woody shrub, iv) seeding with desired species such as host plants or nectar and pollen plants for insects. Also regional railway managers, as well as nature conservation authorities and NGOs, should take part in this endeavor, to help prioritizing the efforts and set them in relation to conservation efforts in the surrounding landscape.The toolbox for railway habitat management needs development. Any adapted management measures should be carefully monitored, in order to build knowledge about their conservation potential and their cost-effectiveness. We also need a better general understanding of the ecology of railway habitats and of the threats to their conservation. However, already the current level of knowledge vouch for immediate action, at selected sites in the existing railway network and in all railway (re-)construction projects.
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| 17. |
- Helldin, Jan Olof, et al.
(författare)
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Så har blomsterlupin spridit sig i Mellansverige
- 2022
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 116, s. 112-119
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Tidskriftsartikel (refereegranskat)abstract
- Garden lupin Lupinus polyphyllus is one of the most problematic invasive alien plant species in Sweden. It is particularly common in road verges where they may threaten biodiversity. We present the results from a study of the distribution of garden lupins in the road network in a 130 km2 area in south central Sweden, following a new census method intended to function as a standard for the Swedish Transport Administration. The complete road network in the area was censused (192 km), from highway to minor forest roads. Lupin stands were found in ~4 percent of major roads and ~2 percent of minor, private roads; yet most lupin stands were found in the minor roads because minor roads are more abundant. A majority of lupin stands (76%) were concentrated around houses with gardens, indicating gardens as the primary source for lupins in the area. The authors propose a strategy for lupin control depending on density: large, dense stands are contained, small stands are eradicated, only lupin free soil is used in road management and local actors are informed in order to prevent further spread.
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| 18. |
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| 19. |
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| 20. |
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| 21. |
- Isaksson, Jenny, et al.
(författare)
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Improved Settling Mechanisms of an Industrial Copper Smelting Slag by CaO Modification
- 2023
-
Ingår i: Journal of Sustainable Metallurgy. - : Springer Nature. - 2199-3823 .- 2199-3831. ; 9:3, s. 1378-1389
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Tidskriftsartikel (refereegranskat)abstract
- A significant source of copper losses from pyrometallurgical copper extraction is attributed to dissolved and entrained copper in discarded slag. Entrained copper can be recovered via pyrometallurgical slag cleaning in a settling furnace, where the slag viscosity and copper droplet size distribution (CDSD) are critical parameters. Reduced copper losses suggest improved raw material efficiency, and the slag becomes a more environmentally safe byproduct. In this study, iron silicate slags from a smelting furnace are industrially CaO modified in a fuming furnace to contain a CaO content between 8 and 18 wt.%. The viscosity of slags with and without CaO modifications is evaluated in the temperature range from 1423 to 1723 K. The influences of the CaO modifications on the CDSD, slag matrix copper content, and total copper content were determined. The results show that the slag viscosity decreases with increasing CaO concentrations in the slag. In addition, the copper content decreases in the slag phase, and the CDSD shifts to contain relatively larger droplets. The effect of CaO slag modification reveals a linear relationship between the overall copper recovery and viscosity, which increased from 63 to 88% when the viscosity in the respective batch was 0.51 and 0.25 Pa·s.
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| 22. |
- Isaksson, Jenny, et al.
(författare)
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Improved Settling Properties of Iron Silicate Slag by CaO Modifications
- 2023
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- One of the most significant sources of copper losses from pyrometallurgical copper extraction is attributed to dissolved and entrained copper in the discarded slag. The entrained copper can be recovered via pyrometallurgical slag cleaning in a settling furnace. Reduced copper losses mean increased smelter profits by improved raw material efficiency, and, in addition, the slag will become a more environmentally safe by-product. One way to increase the copper recovery during the settling process is to modify the slag to improve the properties that decrease copper solubility and slag viscosity. In this study, iron silicate slag was modified using CaCO3 on an industrial scale to evaluate its effect on the settling process. More specifically, the changes in settling were related to the modifications and measurements of slag viscosity and copper droplet size distributions in the slag. The trial was evaluated by comparing the copper content in different batches, the size distribution of copper-containing droplets using automated scanning electron microscopy, and performing rheological studies using a high-temperature rheometer. The results showed that increasing the CaO content of the slag by modification with CaCO3 has a positive effect on the settling process and is thus a possible method to improve the industrial settling process of valuable metals in slag.
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| 23. |
- Isaksson, Jenny, et al.
(författare)
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Industrial Slag Cleaning of Reduced Iron Silicate Slag - Effect of Process Parameters and Slag Modification
- 2022
-
Ingår i: Proceedings of Copper 2022 international conference. ; , s. 22-40
-
Konferensbidrag (refereegranskat)abstract
- During primary copper sulfide smelting and converting, one of the main copper losses is to the slag, which decreases the overall copper recovery. To decrease the copper losses, which are mechanically entrained or dissolved, a slag cleaning route can be used. At the Boliden Rönnskär smelter in Sweden, the slag from the smelting furnace is treated under reducing conditions in a fuming furnace and then tapped into an electric settling furnace where the copper is separated from the slag under the action of gravity. A trial was conducted in the settling furnace at the Rönnskär smelter to increase the knowledge of the copper content in slag and how the process parameters temperature and settling time influence the final slag copper content. The slag was also modified with CaO, to enhance the slag properties for an increased settling velocity and thus decreased copper content. The trial was evaluated by collecting multiple samples of the ingoing and outgoing slag and then compare the slag copper content in the samples. The results showed that the copper content increased with increasing temperature and decreased when the slag was modified with CaO, both parameters had a more pronounced effect compared to the settling time. The slag was also characterized showing that copper was associated with spinels and bubbles, which hinders the settling.
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| 24. |
- Isaksson, Jenny, et al.
(författare)
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Settling of copper phases in lime modified iron silicate slag
- 2021
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Ingår i: Metals. - : MDPI. - 2075-4701. ; 11:7
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Tidskriftsartikel (refereegranskat)abstract
- Copper in discarded slag decreases the profits and copper recovery during the pyrometallurgical extraction processes. The copper losses to slag can be reduced by using a settling furnace, in which mechanically entrained copper droplets separate from the slag under the action of gravity. The settling rate of entrained droplets can be increased by modifying the slag composition and, thus, the slag properties, which are known to influence the settling rate. The knowledge of industrial CaO slag modification in a reduced iron silicate slag with a Fe/SiO2 ratio close to unity is limited. An industrial trial was thus conducted in an electric settling furnace, where the slag had been pretreated in a fuming furnace, to investigate the effect of CaO slag modification on the final slag copper content. Slag samples were collected from the ingoing and outgoing slag and from within the furnace of batches modified with CaO up to about 16 wt %. The trial was evaluated by comparing the final slag copper content and the copper recovery in the settling furnace. The results indicate that the settling becomes more efficient with the CaO modification as the final slag copper content decreased with increasing CaO content.
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| 25. |
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| 26. |
- Karltun, Erik, et al.
(författare)
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Inlagring av koli betesmark
- 2010
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Sveriges klimatrapportering till FN anger en betydligt lägre ackumulering av kol inaturbetesmarker (i genomsnitt 61 kg C/ha och år för perioden 1990–2006; endastinlagring i mark) än vad som har rapporterats för gräsmarker i internationell litteratur (istorleksordningen mer än 1 000 kg C/ha och år; endast inlagring i mark). Eftersomkolinlagring är en viktig men svårbestämd variabel vid bedömningen av betesdriftensmiljöpåverkan är det angeläget att verifiera de skattningar av markkolsförändringar somligger till grund för klimatrapporteringen. Ur naturvårdssynpunkt finns det vidaresärskilda skäl att utreda om det finns några samband mellan biodiversitet ochkolinlagring.En så kallad massbalansmetod användes för att verifiera klimatrapporteringen.Kolinlagringen skattades genom att först räkna ut hur mycket kväve som binds in imarken och därefter multiplicera mängden kväve med markens C/N-kvot. Mängdenackumulerat kväve räknades ut med hjälp av uppgifter om kvävedeposition, upptag avkväve i biomassa och utlakning av kväve från naturbetesmark. Indata hämtades frånriksinventeringen av skog (riksskogstaxeringen och markinventeringen) och andramiljöövervakningsdatabaser. För perioden 1990–2006 skattades markkolsinlagringen inaturbetesmarker till i genomsnitt 30 kg kol per hektar och år. Tio års ackumuleringmotsvarar i storleksordning en procent av den totala markkolspoolen. Den årligainlagringen motsvarar mindre än fem procent av de årliga växthusgasutsläppen från densvenska djurhållningen. Den låga ackumuleringen av kol i svenska naturbetesmarkerkan förklaras med att naturbetesmarkerna i huvudsak sköts extensivt utan att gödslas.Klimatkompensationen blir drygt tio procent om även biomassaökningen i träd ochbuskar tas med i beräkningarna.Data från riksskogstaxeringens vegetationsinventering användes för att klassabetesmarkerna utifrån hävdstatus och artmångfald. Det fanns inga statistiskt signifikantaskillnader i kolmängd mellan provytor med höga indikatorvärden för hävd jämfört medytor med lägre hävdklassificering. Det fanns inte heller några statistiskt signifikantaskillnader i mängden markkol mellan ytor med få arter och ytor med många arter.En kategori betesmarker som faller utanför denna studie är åkermark som relativt sentövergått till permanent bete. Det är troligt att dessa marker är mer effektiva på att lagrain kol på grund av bättre näringsstatus och högre produktion.
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| 27. |
- Lennartsson, Tommy
(författare)
-
Arv från försvinnande landskap
- 2012
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Ingår i: Biodiverse. - 1401-5064. ; 2012, s. 8-9
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 28. |
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| 29. |
- Lennartsson, Tommy, et al.
(författare)
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Between nature and society: the interpretation of an early nineteenth-century Swedish farmer’s diary.
- 2015
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Ingår i: Agricultural History Review. - 0002-1490. ; 63, s. 265-285
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Tidskriftsartikel (refereegranskat)abstract
- Pre-industrial agriculture was largely based on local natural resources, which needed to be handled together with a variety of societal factors. In this study we use an unusually detailed Swedish farming priest's diary to show interactions between ecology and society at the micro-level, and how they influenced the decisions and actions made by the household. The diary is analysed by using the conceptual framework of social-ecological systems (SES). We focus on years in the 1810s, when extreme weather conditions made the weaknesses and potentials of the agrarian system particularly visible through their impact on the production of hay and pasture.
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| 30. |
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| 31. |
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| 32. |
- Lennartsson, Tommy
(författare)
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Biologisk mångfald i fjällen
- 2011
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Ingår i: Naturvårdskedjan - för en effektivare naturvård. - 9789189232600 ; :48, s. 288-306
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Bokkapitel (refereegranskat)
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| 33. |
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| 34. |
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| 35. |
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| 36. |
- Lennartsson, Tommy, et al.
(författare)
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Biologiskt kulturarv vitaliserar vägforskningen
- 2013
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Ingår i: Berättelser från markerna : en antologi om järn, skog och kulturarv. - 9789197117746 ; :1, s. 225-232
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Bokkapitel (populärvet., debatt m.m.)
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| 37. |
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| 38. |
- Lennartsson, Tommy, et al.
(författare)
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Defining the reference situation for biodiversity in Life Cycle Assessments: Review and recommendations
- 2016
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Biodiversity – crucial for ecosystem health and its products and services – is being lost at an alarming rate. Several models that aim to assess biodiversity impacts in Life Cycle Assessments have been proposed, but there are still some obstacles before these models become biologically realistic and feasible. One of the major challenges to be addressed is the identification of an appropriate reference situation for biodiversity, to serve as a point of comparison for assessing changes over time. However, this reference could be a point in the past, present, or future, and its choice will imply different interpretations of land use and land transformation impacts. Here we provide a short introduction to this topic and outline the main challenges as well as possible solutions to properly incorporate biodiversity reference situations in Life Cycle Assessments.
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| 39. |
- Lennartsson, Tommy, et al.
(författare)
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Diversity in Ecological and Social Contexts
- 2018
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Ingår i: Issues and Concepts in Historical Ecology. - Cambridge : Cambridge University Press. - 9781108420983 - 9781108355780 ; , s. 182-239
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Konferensbidrag (refereegranskat)
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| 40. |
- Lennartsson, Tommy
(författare)
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Growing competitive or tolerant? Significance of apical dominance in the overcompensating herb Gentianella campestris
- 2018
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Ingår i: Ecology. - : Wiley. - 0012-9658 .- 1939-9170. ; 99, s. 259-269
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Tidskriftsartikel (refereegranskat)abstract
- As a compensatory response to herbivory, plants may branch vigorously when the growth of dormant meristems is triggered by shoot damage. Undamaged plants, on the other hand, often restrain branching, and this limitation on growth can be considered a cost of tolerance to herbivory. Restrained branching is caused by apical dominance and may, alternatively, be associated with fitness benefits in competitive environments that favor fast vertical growth. To test these hypotheses regarding selection for restrained branching, we compared the performance of two subspecies of the biennial grassland herb Gentianella campestris; the tall, apically dominant ssp. campestris and the short, multi-stemmed ssp. islandica, which shows reduced apical dominance. For both subspecies, we manipulated the height of surrounding vegetation (competition) and damage intensity in grasslands of differing productivity (high, medium, low), and examined population growth rates using matrix population models combined with life table response experiments. In the absence of damage, ssp. campestris exhibited a higher population growth rate than ssp. islandica in the tallest vegetation, however with the growth rate still being below one. In the medium and low productivity environments where the vegetation was shorter, the population growth rate of ssp. islandica was considerably higher than that of ssp. campestris as long as no more than about 50% of the plants were damaged. When plants were damaged, the apically dominant ssp. campestris showed a positive population growth rate (lambda>1) and often overcompensatory seed production in all productivity levels, while ssp. islandica showed no compensation and therefore the population was predicted to decline (lambda<1). We conclude that restrained branching in Gentianella cannot be selected for by competition alone, but that episodes of apical damage are required to maintain the trait. Furthermore, because of the costs of restrained branching, apical dominance should be selected against in grasslands where competition and disturbance are low.
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| 41. |
- Lennartsson, Tommy
(författare)
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High Nature Value Farming in Sweden
- 2012
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Ingår i: High nature Value Farming in Europe. - 9783897356573 ; , s. 406-420
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 42. |
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| 43. |
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| 44. |
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| 45. |
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| 46. |
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| 47. |
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| 48. |
- Lennartsson, Tommy
(författare)
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Impacts of roads on bird species richness: A meta-analysis considering road types, habitats and feeding guilds
- 2022
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Ingår i: Science of the Total Environment. - : Elsevier BV. - 0048-9697 .- 1879-1026. ; 812
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Tidskriftsartikel (refereegranskat)abstract
- Roadsides can harbour remarkable biodiversity; thus, they are increasingly considered as habitats with potential for conservation value. To improve construction and management of roadside habitats with positive effects on biodiversity, we require a quantitative understanding of important influential factors that drive both positive and negative effects of roads. We conducted meta-analyses to assess road effects on bird communities. We spe-cifically tested how the relationship between roads and bird richness varies when considering road type, habitat characteristics and feeding guild association. Overall, bird richness was similar in road habitats compared to non -road habitats, however, the two apparently differ in species composition. Bird richness was lowered by road pres-ence in areas with denser tree cover but did not differ according to road type. Richness differences between hab-itats with and without roads further depended on primary diet of species, and richness of omnivores was positively affected by road presence. We conclude that impacts of roads on bird richness are highly context-dependent, and planners should carefully evaluate road habitats on a case by case basis. This emphasizes the need for further studies that explicitly test for differences in species composition and abundance, to disentangle contexts where a road will negatively affect bird communities, and where it will not. (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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