globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13362
论文题名:
Enhanced summer warming reduces fungal decomposer diversity and litter mass loss more strongly in dry than in wet tundra
作者: Christiansen C.T.; Haugwitz M.S.; Priemé A.; Nielsen C.S.; Elberling B.; Michelsen A.; Grogan P.; Blok D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:1
起始页码: 406
结束页码: 420
语种: 英语
英文关键词: Arctic ; Ascomycota ; Basidiomycota ; Betula glandulosa ; climate warming ; deepened snow ; fungi ; litter decomposition ; litter moisture
Scopus关键词: climate change ; deciduous tree ; decomposition ; fungus ; litter ; snow ; summer ; tundra ; Arctic ; Disko Island ; Greenland ; Ascomycota ; Basidiomycota ; Betula glandulosa ; Fungi
英文摘要: Many Arctic regions are currently experiencing substantial summer and winter climate changes. Litter decomposition is a fundamental component of ecosystem carbon and nutrient cycles, with fungi being among the primary decomposers. To assess the impacts of seasonal climatic changes on litter fungal communities and their functioning, Betula glandulosa leaf litter was surface-incubated in two adjacent low Arctic sites with contrasting soil moisture regimes: dry shrub heath and wet sedge tundra at Disko Island, Greenland. At both sites, we investigated the impacts of factorial combinations of enhanced summer warming (using open-top chambers; OTCs) and deepened snow (using snow fences) on surface litter mass loss, chemistry and fungal decomposer communities after approximately 1 year. Enhanced summer warming significantly restricted litter mass loss by 32% in the dry and 17% in the wet site. Litter moisture content was significantly reduced by summer warming in the dry, but not in the wet site. Likewise, fungal total abundance and diversity were reduced by OTC warming at the dry site, while comparatively modest warming effects were observed in the wet site. These results suggest that increased evapotranspiration in the OTC plots lowered litter moisture content to the point where fungal decomposition activities became inhibited. In contrast, snow addition enhanced fungal abundance in both sites but did not significantly affect litter mass loss rates. Across sites, control plots only shared 15% of their fungal phylotypes, suggesting strong local controls on fungal decomposer community composition. Nevertheless, fungal community functioning (litter decomposition) was negatively affected by warming in both sites. We conclude that although buried soil organic matter decomposition is widely expected to increase with future summer warming, surface litter decay and nutrient turnover rates in both xeric and relatively moist tundra are likely to be significantly restricted by the evaporative drying associated with warmer air temperatures. © 2016 John Wiley & Sons Ltd
资助项目: We thank Yvette Chirinian, Esben Nielsen, Jillian Lemmen, Olivia Rodee, Alyssa Filippi, Shelby Clarke and Gigi Pao for field and laboratory assistance. Sue Natali, Virginia Walker and Neal Scott supplied helpful comments on an earlier version of this manuscript. This work was financed by NSERC, the Government of the Northwest Territories, and the Danish National Research Foundation (CENPERM DNRF 100). Casper Christiansen was financed by an Ontario Trillium scholarship from the Ontario Ministry of Training, Colleges and Universities.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61131
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biology, Queen's University, Kingston, ON, Canada; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; Department of Biology, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark; Arctic Station, Faculty of Science, University of Copenhagen, Qeqertarsuaq, Greenland; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden

Recommended Citation:
Christiansen C.T.,Haugwitz M.S.,Priemé A.,et al. Enhanced summer warming reduces fungal decomposer diversity and litter mass loss more strongly in dry than in wet tundra[J]. Global Change Biology,2017-01-01,23(1)
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