globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005084
Scopus记录号: 2-s2.0-85027955958
论文题名:
Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia
作者: Wild B; , Schnecker J; , Knoltsch A; , Takriti M; , Mooshammer M; , Gentsch N; , Mikutta R; , Alves R; J; E; , Gittel A; , Lashchinskiy N; , Richter A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:5
起始页码: 567
结束页码: 582
语种: 英语
英文关键词: boreal forest ; permafrost ; protein depolymerization ; tundra
Scopus关键词: boreal forest ; nitrification ; nitrogen cycle ; nutrient availability ; permafrost ; polymer ; protein ; soil horizon ; soil microorganism ; soil nitrogen ; subsoil ; topsoil ; transect ; tundra ; Siberia
英文摘要: Soil N availability is constrained by the breakdown of N-containing polymers such as proteins to oligopeptides and amino acids that can be taken up by plants and microorganisms. Excess N is released from microbial cells as ammonium (N mineralization), which in turn can serve as substrate for nitrification. According to stoichiometric theory, N mineralization and nitrification are expected to increase in relation to protein depolymerization with decreasing N limitation, and thus from higher to lower latitudes and from topsoils to subsoils. To test these hypotheses, we compared gross rates of protein depolymerization, N mineralization and nitrification (determined using 15N pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67°N) to steppe (54°N). The investigated ecosystems differed strongly in N transformation rates, with highest protein depolymerization and N mineralization rates in middle and southern taiga. All N transformation rates decreased with soil depth following the decrease in organic matter content. Related to protein depolymerization, N mineralization and nitrification were significantly higher in mineral than in organic horizons, supporting a decrease in microbial N limitation with depth. In contrast, we did not find indications for a decrease in microbial N limitation from arctic to temperate ecosystems along the transect. Our findings thus challenge the perception of ubiquitous N limitation at high latitudes, but suggest a transition from N to C limitation of microorganisms with soil depth, even in high-latitude systems such as tundra and boreal forest. ©2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77972
Appears in Collections:气候变化事实与影响

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作者单位: Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria; Austrian Polar Research Institute, Vienna, Austria; Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Institute of Soil Science, Leibniz Universität Hannover, Hannover, Germany; Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria; Department of Biology, Centre for Geobiology, University of Bergen, Bergen, Norway; Department of Bioscience, Center for Geomicrobiology, Aarhus, Denmark; Central Siberian Botanical Garden, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation

Recommended Citation:
Wild B,, Schnecker J,, Knoltsch A,et al. Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia[J]. Global Biogeochemical Cycles,2015-01-01,29(5)
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