globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-016-0184-x
Scopus记录号: 2-s2.0-84959519529
论文题名:
Limited variation in proportional contributions of auto- and heterotrophic soil respiration, despite large differences in vegetation structure and function in the Low Arctic
作者: Cahoon S.M.P.; Sullivan P.F.; Gamm C.; Welker J.M.; Eissenstat D.; Post E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 127, 期:2018-02-03
起始页码: 339
结束页码: 351
语种: 英语
英文关键词: 13C labeling ; Arctic ; Carbon ; Respiration partitioning
Scopus关键词: autotrophy ; microbial activity ; microclimate ; numerical method ; rhizosphere ; shrub ; soil carbon ; soil organic matter ; tundra ; vegetation structure ; Arctic ; Greenland ; West Greenland ; Betula ; Betula nana ; Poa ; Salix ; Salix glauca
英文摘要: Arctic ecosystems contain vast stores of soil carbon (C), yet our understanding of the factors controlling CO2 efflux from tundra soils remains poor. Partitioning soil respiration (RS) into heterotrophic (RH) and autotrophic (RA) sources can help elucidate the relative contributions from microbial breakdown of soil organic matter (SOM) and root and rhizospheric activities—two processes that can have contrasting effects on long-term soil C stocks. Using two techniques, we quantified the magnitudes, relative proportions and environmental drivers of RH and RA in four common arctic vegetation types in West Greenland. We employed a trenching method in large patches of Betula nana, Salix glauca, mixed-shrub (equal mix of Betula and Salix) and graminoids dominated by Poa spp. At a nearby location, we introduced 13CO2 to Betula- and graminoid-dominated plots. The difference in the autotrophic proportion (RA/RS) between methods was minimal, providing confidence that our more extensive trenching approach provided accurate estimates of RA and RH. Despite contrasting microclimate conditions, large differences in vegetation structure and wide variation in RS, there were minimal differences in mean RA/RS (0.40–0.48 across all vegetation types). Our results suggest that RA/RS may be more conservative than previously thought for low-productivity ecosystems. We suggest that partitioning RS into RA and RH may be a useful tool to identify ecosystems that have fallen out of equilibrium and may be poised to either gain or lose soil C. © 2016, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83412
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: The Polar Center and Department of Biology, Pennsylvania State University, University Park, PA, United States; Environment and Natural Resources Institute, University of Alaska Anchorage, Anchorage, AK, United States; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States; Department of Ecosystem Science and Management, Pennsylvania State University, University Park, PA, United States

Recommended Citation:
Cahoon S.M.P.,Sullivan P.F.,Gamm C.,et al. Limited variation in proportional contributions of auto- and heterotrophic soil respiration, despite large differences in vegetation structure and function in the Low Arctic[J]. Biogeochemistry,2016-01-01,127(2018-02-03)
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