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Responses of tundra...
Responses of tundra plant community carbon flux to experimental warming, dominant species removal and elevation
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- Sundqvist, Maja, 1980 (författare)
- Umeå universitet,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Gothenburg,Umeå University,University of Copenhagen,Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; The Center for Macroecology, Evolution and Climate, The Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark,Institutionen för ekologi, miljö och geovetenskap,Arcum
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- Sanders, N. J. (författare)
- University of Vermont,University of Copenhagen
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- Dorrepaal, Ellen (författare)
- Umeå universitet,Umeå University,Institutionen för ekologi, miljö och geovetenskap,Arcum
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- Lindén, Elin (författare)
- Umeå universitet,Umeå University,Institutionen för ekologi, miljö och geovetenskap
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- Metcalfe, Daniel B. (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Newman, G. S. (författare)
- University of Copenhagen,University of Oklahoma
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- Olofsson, Johan (författare)
- Umeå universitet,Umeå University,Institutionen för ekologi, miljö och geovetenskap
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- Wardle, D. A. (författare)
- Nanyang Technological University
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- Classen, A. T. (författare)
- University of Copenhagen,University of Vermont
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(creator_code:org_t)
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- 2020-04-30
- 2020
- Engelska.
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Ingår i: Functional Ecology. - : Wiley. - 0269-8463 .- 1365-2435. ; 34:7, s. 1497-1506
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Abstract
Ämnesord
Stäng
- Rising temperatures can influence ecosystem processes both directly and indirectly, through effects on plant species and communities. An improved understanding of direct versus indirect effects of warming on ecosystem processes is needed for robust predictions of the impacts of climate change on terrestrial ecosystem carbon (C) dynamics. To explore potential direct and indirect effects of warming on C dynamics in arctic tundra heath, we established a warming (open top chambers) and dominant plant species (Empetrum hermaphroditum Hagerup) removal experiment at a high and low elevation site. We measured the individual and interactive effects of warming, dominant species removal and elevation on plant species cover, the normalized difference vegetation index (NDVI), leaf area index (LAI), temperature, soil moisture and instantaneous net ecosystem CO2 exchange. We hypothesized that ecosystems would be stronger CO2 sinks at the low elevation site, and that warming and species removal would weaken the CO2 sink because warming should increase ecosystem respiration (ER) and species removal should reduce gross primary productivity (GPP). Furthermore, we hypothesized that warming and species removal would have the greatest impact on processes at the high elevation where site temperature should be most limiting and dominant species may buffer the overall community to environmental stress more compared to the low elevation site where plants are more likely to compete with the dominant species. The instantaneous CO2 flux, which reflected a weak CO2 sink, was similar at both elevations. Neither experimental warming nor dominant species removal significantly changed GPP or instantaneous net ecosystem CO2 exchange even though species removal significantly reduced ER, NDVI and LAI. Our results show that even the loss of dominant plant species may not result in significant landscape-scale responses of net ecosystem CO2 exchange to warming. They also show that NDVI and LAI may be limited in their ability to predict changes in GPP in these tundra heaths systems. Our study highlights the need for more detailed vegetation analyses and ground-truthed measurements in order to accurately predict direct and indirect impacts of climatic change on ecosystem C dynamics. A free Plain Language Summary can be found within the Supporting Information of this article.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
Nyckelord
- carbon
- ecosystem respiration
- global warming
- gross primary
- productivity
- leaf area index
- normalized difference vegetation index
- plant-plant interactions
- co2 flux
- soil respiration
- dwarf shrubs
- nitrogen
- decomposition
- ecosystems
- vegetation
- diversity
- increase
- feedback
- Environmental Sciences & Ecology
- gross primary productivity
- plant–plant interactions
- carbon
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- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
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Sundqvist, Maja, ...
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Sanders, N. J.
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Dorrepaal, Ellen
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Lindén, Elin
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Metcalfe, Daniel ...
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Newman, G. S.
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visa fler...
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Olofsson, Johan
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Wardle, D. A.
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Classen, A. T.
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visa färre...
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och Naturgeografi
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