globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13294
论文题名:
Long-term increase in snow depth leads to compositional changes in arctic ectomycorrhizal fungal communities
作者: Morgado L.N.; Semenova T.A.; Welker J.M.; Walker M.D.; Smets E.; Geml J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:9
起始页码: 3080
结束页码: 3096
语种: 英语
英文关键词: arctic ecology ; climate changes ; fungal ecology ; ITEX ; snow fence ; snow pack ; Toolik Lake
Scopus关键词: climate change ; community composition ; ectomycorrhiza ; fungus ; snow cover ; snowpack ; soil temperature ; species richness ; tundra ; Alaska ; Arctic ; Toolik Lake ; United States ; Cortinarius ; Inocybe ; Tomentella
英文摘要: Many arctic ecological processes are regulated by soil temperature that is tightly interconnected with snow cover distribution and persistence. Recently, various climate-induced changes have been observed in arctic tundra ecosystems, e.g. shrub expansion, resulting in reduction in albedo and greater C fixation in aboveground vegetation as well as increased rates of soil C mobilization by microbes. Importantly, the net effects of these shifts are unknown, in part because our understanding of belowground processes is limited. Here, we focus on the effects of increased snow depth, and as a consequence, increased winter soil temperature on ectomycorrhizal (ECM) fungal communities in dry and moist tundra. We analyzed deep DNA sequence data from soil samples taken at a long-term snow fence experiment in Northern Alaska. Our results indicate that, in contrast with previously observed responses of plants to increased snow depth at the same experimental site, the ECM fungal community of the dry tundra was more affected by deeper snow than the moist tundra community. In the dry tundra, both community richness and composition were significantly altered while in the moist tundra, only community composition changed significantly while richness did not. We observed a decrease in richness of Tomentella, Inocybe and other taxa adapted to scavenge the soil for labile N forms. On the other hand, richness of Cortinarius, and species with the ability to scavenge the soil for recalcitrant N forms, did not change. We further link ECM fungal traits with C soil pools. If future warmer atmospheric conditions lead to greater winter snow fall, changes in the ECM fungal community will likely influence C emissions and C fixation through altering N plant availability, fungal biomass and soil-plant C-N dynamics, ultimately determining important future interactions between the tundra biosphere and atmosphere. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
资助项目: Financial support for this project was provided by the NWO-ALW Open Programme research grant (821.01.016) awarded to E. Smets and J. Geml and the Naturalis personal research budgets of J. Geml and L. Morgado. The experimental work is largely supported by NSF grants OPP AON 0856728 and OPP IPY ITEX 0632184 awarded to JM Welker. The authors thank the staff of the Toolik Field Station for logistical support, and Marcel Eurlings and Elza Duijm (Naturalis Biodiversity Center) for conducting the Ion Torrent sequencing. The authors are grateful to Todd O'Hara and Perry S. Barboza (University of Alaska Fairbanks) for providing equipment and assistance to lyophilize the large quantities of soil samples. The authors are also thankful for the insightful comments to an earlier version of the paper by two anonymous reviewers.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61313
Appears in Collections:影响、适应和脆弱性

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作者单位: Naturalis Biodiversity Center, P.O. Box 9517, Leiden, Netherlands; Section for Genetics and Evolutionary Biology (Evogene), Department of Biosciences, University of Oslo, P.O. Box 1066 Blindern, Oslo, Norway; Faculty of Science, Leiden University, P.O. Box 9502, Leiden, Netherlands; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States; HOMER Energy, 1790 30th St, Suite 100, Boulder, CO, United States; Plant Conservation and Population Biology, KU Leuven, Kasteelpark Arenberg 31, Box 2437, Leuven, Belgium

Recommended Citation:
Morgado L.N.,Semenova T.A.,Welker J.M.,et al. Long-term increase in snow depth leads to compositional changes in arctic ectomycorrhizal fungal communities[J]. Global Change Biology,2016-01-01,22(9)
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