globalchange  > 气候变化与战略
DOI: 10.1002/ecm.1396
论文题名:
Removal of grazers alters the response of tundra soil carbon to warming and enhanced nitrogen availability
作者: Ylänne H.; Kaarlejärvi E.; Väisänen M.; Männistö M.K.; Ahonen S.H.K.; Olofsson J.; Stark S.
刊名: Ecological Monographs
ISSN: 129615
出版年: 2020
卷: 90, 期:1
语种: 英语
英文关键词: fertilization ; herbivory ; land use ; open-top chamber ; Rangifer tarandus ; reindeer ; SEM ; soil carbon storage
Scopus关键词: abundance ; carbon storage ; deer ; enzyme activity ; grazing ; herbivory ; long-term change ; open-top chamber ; pollutant removal ; soil carbon ; soil nitrogen ; tundra soil ; Arctic ; Rangifer tarandus
英文摘要: The circumpolar Arctic is currently facing multiple global changes that have the potential to alter the capacity of tundra soils to store carbon. Yet, predicting changes in soil carbon is hindered by the fact that multiple factors simultaneously control processes sustaining carbon storage and we do not understand how they act in concert. Here, we investigated the effects of warmer temperatures, enhanced soil nitrogen availability, and the combination of these on tundra carbon stocks at three different grazing regimes: on areas with over 50-yr history of either light or heavy reindeer grazing and in 5-yr-old exlosures in the heavily grazed area. In line with earlier reports, warming generally decreased soil carbon stocks. However, our results suggest that the mechanisms by which warming decreases carbon storage depend on grazing intensity: under long-term light grazing soil carbon losses were linked to higher shrub abundance and higher enzymatic activities, whereas under long-term heavy grazing, carbon losses were linked to drier soils and higher enzymatic activities. Importantly, under enhanced soil nitrogen availability, warming did not induce soil carbon losses under either of the long-term grazing regimes, whereas inside exclosures in the heavily grazed area, also the combination of warming and enhanced nutrient availability induced soil carbon loss. Grazing on its own did not influence the soil carbon stocks. These results reveal that accounting for the effect of warming or grazing alone is not sufficient to reliably predict future soil carbon storage in the tundra. Instead, the joint effects of multiple global changes need to be accounted for, with a special focus given to abrupt changes in grazing currently taking place in several parts of the Arctic. © 2019 by the Ecological Society of America
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159591
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作者单位: Arctic Center, University of Lapland, P.O. Box 122, Rovaniemi, FI-96101, Finland; Department of Ecology and Genetics, University of Oulu, P.O. Box 3000, Oulu, FI-90100, Finland; Department of Ecology and Environmental Sciences, Umeå University, Umeå, SE-90187, Sweden; Department of Biology, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussel, B-1050, Belgium; Natural Resources Institute Finland (Luke), Eteläranta 55, Rovaniemi, FI-96300, Finland; Centre for Environmental and Climate Research, Lund University, P. O. Box 118, Lund, SE-221 00, Sweden; Research Centre for Ecological Change, Organismal and Evolutionary Biology, University of Helsinki, P.O. Box 65 (Viikinkaari 1), Helsinki, FI-00014, Finland

Recommended Citation:
Ylänne H.,Kaarlejärvi E.,Väisänen M.,et al. Removal of grazers alters the response of tundra soil carbon to warming and enhanced nitrogen availability[J]. Ecological Monographs,2020-01-01,90(1)
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