globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12475
论文题名:
Soil C and N availability determine the priming effect: Microbial N mining and stoichiometric decomposition theories
作者: Chen R.; Senbayram M.; Blagodatsky S.; Myachina O.; Dittert K.; Lin X.; Blagodatskaya E.; Kuzyakov Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期:7
起始页码: 2356
结束页码: 2367
语种: 英语
英文关键词: C cycle ; Extracellular enzyme activity ; Microbial growth kinetics ; Priming mechanisms ; R and K strategy ; Soil microbial biomass ; Soil organic matter turnover
Scopus关键词: biomass ; carbon cycle ; decomposition analysis ; enzyme activity ; microbial community ; nitrogen cycle ; soil carbon ; soil nitrogen ; soil organic matter ; stoichiometry ; theoretical study ; Zea mays ; carbon ; nitrogen ; soil ; sucrose ; chemistry ; maize ; metabolism ; microbiology ; soil ; Carbon ; Nitrogen ; Soil ; Soil Microbiology ; Sucrose ; Zea mays
英文摘要: The increasing input of anthropogenically derived nitrogen (N) to ecosystems raises a crucial question: how does available N modify the decomposer community and thus affects the mineralization of soil organic matter (SOM). Moreover, N input modifies the priming effect (PE), that is, the effect of fresh organics on the microbial decomposition of SOM. We studied the interactive effects of C and N on SOM mineralization (by natural 13C labelling adding C4-sucrose or C4-maize straw to C3-soil) in relation to microbial growth kinetics and to the activities of five hydrolytic enzymes. This encompasses the groups of parameters governing two mechanisms of priming effects - microbial N mining and stoichiometric decomposition theories. In sole C treatments, positive PE was accompanied by a decrease in specific microbial growth rates, confirming a greater contribution of K-strategists to the decomposition of native SOM. Sucrose addition with N significantly accelerated mineralization of native SOM, whereas mineral N added with plant residues accelerated decomposition of plant residues. This supports the microbial mining theory in terms of N limitation. Sucrose addition with N was accompanied by accelerated microbial growth, increased activities of β-glucosidase and cellobiohydrolase, and decreased activities of xylanase and leucine amino peptidase. This indicated an increased contribution of r-strategists to the PE and to decomposition of cellulose but the decreased hemicellulolytic and proteolytic activities. Thus, the acceleration of the C cycle was primed by exogenous organic C and was controlled by N. This confirms the stoichiometric decomposition theory. Both K- and r-strategists were beneficial for priming effects, with an increasing contribution of K-selected species under N limitation. Thus, the priming phenomenon described in 'microbial N mining' theory can be ascribed to K-strategists. © 2013 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62223
Appears in Collections:影响、适应和脆弱性

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作者单位: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; Institute of Plant Nutrition and Soil Science, Christian-Albrecht University Kiel, Kiel, 24118, Germany; Institute of Applied Plant Nutrition, Georg-August University Goettingen, Goettingen, 37075, Germany; Institute for Plant Production and Agroecology in the Tropics and Subtropics, University of Hohenheim, Stuttgart, 70593, Germany; Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, Institutskaya 2, Pushchino, 142290, Russian Federation; Institute of General and Inorganic Chemistry, Tashkent, 100170, Uzbekistan; Department of Soil Science of Temperate Ecosystems, Georg-August University of Göttingen, Göttingen, 37077, Germany; Department of Agricultural Soil Science, Georg-August University of Göttingen, Göttingen, 37077, Germany

Recommended Citation:
Chen R.,Senbayram M.,Blagodatsky S.,et al. Soil C and N availability determine the priming effect: Microbial N mining and stoichiometric decomposition theories[J]. Global Change Biology,2014-01-01,20(7)
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