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- Backéus, Ingvar
(författare)
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Blandmyr på kartbladen Örebro NV och NO
- 1978
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Ingår i: Geologiska Föreningens i Stockholm Förhandlingar. ; 100, s. 407-408
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Tidskriftsartikel (refereegranskat)abstract
- Six mire sites designated as mixed mires on the geological maps Örebro NV and NO have been surveyed. All of them were found to be entirely ombrotrophic bogs. The necessity of considering the composition of the vegetation in drawing the distinction between ombrotrophic and minerotrophic mire sites is pointed out.
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- Backéus, Ingvar, 1945-, et al.
(författare)
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Bog vegetation re-mapped after 63 and 103 years : expansion of Rhynchospora alba (Studies on Skagershultsmossen 2)
- 2023
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Ingår i: Mires and Peat. - : International Mire Conservation Group and International Peatland Society. - 1819-754X. ; 29, s. 1-16
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Tidskriftsartikel (refereegranskat)abstract
- The vegetation in an area of the ombrotrophic bog Skagershultsmossen, South-Central Sweden, was mapped in 2010. The same area was previously surveyed in 1907 and 1970. Only small changes were found in 1970, in contrast to the situation in 2010, when a large shift in the vegetation was observed. The previously dominating vegetation type, lawns dominated by Eriophorum vaginatum, had more or less disappeared and was replaced by carpet vegetation dominated by Rhynchospora alba, Sphagnum tenellum and S. balticum. Also, the carpets dominated by Scheuchzeria palustris had decreased to a large extent. There are several possible climatic explanations behind the changes, and we suggest that increased frost action linked to the reduction in snow cover may be important. The shift in the vegetation has most certainly led to a decrease in peat productivity and, hence, a reduction in carbon sequestration by the bog is assumed. Skagershultsmossen is an important reference site for future studies of long-term vegetation changes.
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- Backéus, Ingvar
(författare)
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Bog vegetation re-Mapped after sixty years : Studies on Skagershultamossen, central Sweden
- 1972
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Ingår i: Oikos. - : JSTOR. - 0030-1299 .- 1600-0706. ; 23:3, s. 384-393
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Tidskriftsartikel (refereegranskat)abstract
- The author has re-mapped two areas on Skagershultamossen. The new maps have been compared with maps of the same areas from 1910, made by L. von Post. The vegetation changes are small. The open water surfaces have diminished in number and extent. The theory of cyclic succession on peat bogs finds no support from the maps. Plant communities have been delimited as to correspond to those on the old maps and defined through analysis of a number of sample plots
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- Backéus, Ingvar, 1945-, et al.
(författare)
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"Det har vi vetat hela tiden!" : akademikerna och lövängen för hundra år sedan
- 2019
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 113:3/4, s. 219-231
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Tidskriftsartikel (refereegranskat)abstract
- Mown meadows with scattered trees were a characteristic of the old Swedish landscape. It has been an established truth that the botanists, particularly R. Sernander and H. Hesselman, did not understand that the meadows would turn into forests when abandoned, whereas the human geographer M. Sjöbeck in several publications from 1927 onwards made this clear. This view was supported by, i.a,. L.-G. Romell. We have scrutinized the literature and the minutes of the Plant Biology Seminar in Uppsala from 1892 to 1944, in order to understand Sernander’s views. Hesselman considered the matter uncertain. Sernander probably understood the dynamics also before 1927, but his standpoint was influenced by a wish to restore the postglacial broadleaved forests of which he saw the meadows as degraded relicts. This could be done by leaving meadows for free development. Gradually he saw the need also to maintain meadows and the cultural landscape as such. Several other botanists, e.g. G. Samuelsson and G. Einar Du Rietz, already early on understood the dependence of meadows on human management.
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- Backéus, Ingvar, 1945-, et al.
(författare)
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Diameter growth of trees in miombo and acacia woodland in an eroded landscape in NE Tanzania
- 2022
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Ingår i: African Journal of Ecology. - : Wiley. - 0141-6707 .- 1365-2028.
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Tidskriftsartikel (refereegranskat)abstract
- Diameter increment of trees typical of miombo and acacia woodland was studied dur- ing a period of 20 years in Kondoa district, Tanzania. The study was performed in permanent plots in a severely degraded area subjected to considerable restoration efforts. A total of 15 species were selected from a database collected within a pro- ject for monitoring the landscape recovery. Growth performance of African woodland species was searched for in the literature for comparison, and a comprehensive list of citations was compiled. We found growth to fall within the range reported in earlier studies, although growth varied both between and within species. There are reports that the radial increments of trees are unimodal over their lifespan, but we found no clear support. In several species, the annual growth increased with stem diameter. Growth during the rainy ENSO year 1997/98 was pairwise compared with the preced- ing two years and was found to be significantly higher during the wet year, pointing to soil water as a limiting factor. We conclude that free development is an alternative to tree planting on marginal land.
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- Backéus, Ingvar
(författare)
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Distribution and vegetation dynamics of humid savannas in Africa and Asia
- 1992
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Ingår i: Journal of Vegetation Science. - 1100-9233 .- 1654-1103. ; 3, s. 345-356
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Tidskriftsartikel (refereegranskat)abstract
- A review is presented on the literature about the distribution of savannas in humid climates in Africa and Asia and their vegetation dynamics. Sections are devoted to African lowland and montane savannas (the latter divided into southern, eastern, western and northern African), Madagascar, Indian subcontinent, SE Asia and New Guinea. It is concluded that the extension of savannas under humid climatic conditions and the relation to the distribution of forests is a function of cultivation, grazing by domestic and wild animals, present and previous climate, geomorphology and soil characteristics. Once established, savannas are often maintained by fires, both natural and man-made.Montane savannas are generally brought about by man's clearing, cultivation and burning. Fire is a stochastic variable; it creates an ecotone sensu stricto (an environmentally stochastic stress zone) at the forest/savanna border. On the other hand, if geomorphology and soil are the determinants, the transition between forest and savanna would have the character of an ecocline (a gradient zone) with fundamentally different conditions.In humid African lowland climates forests expand into savannas if the latter are not maintained by man. Whether forests also expand in less humid climates is disputed. In montane areas forest expansion may be delayed on degraded soils and when diaspores are lacking
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