DOI: 10.1111/gcb.14304
Scopus记录号: 2-s2.0-85051473230
论文题名: Shifts in priming partly explain impacts of long-term nitrogen input in different chemical forms on soil organic carbon storage
作者: Song M. ; Guo Y. ; Yu F. ; Zhang X. ; Cao G. ; Cornelissen J.H.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 9 起始页码: 4160
结束页码: 4172
语种: 英语
英文关键词: alpine meadow
; functional groups
; nitrogen chemical form
; priming effect
; soil microbes
; soil organic carbon
; Tibetan Plateau
英文摘要: Input of labile organic carbon can enhance decomposition of extant soil organic carbon (SOC) through priming. We hypothesized that long-term nitrogen (N) input in different chemical forms alters SOC pools by altering priming effects associated with N-mediated changes in plants and soil microbes. The hypothesis was tested by integrating field experimental data of plants, soil microbes and two incubation experiments with soils that had experienced 10 years of N enrichment with three chemical forms (ammonium, nitrate and both ammonium and nitrate) in an alpine meadow on the Tibetan Plateau. Incubations with glucose–13C addition at three rates were used to quantify effects of exogenous organic carbon input on the priming of SOC. Incubations with microbial inocula extracted from soils that had experienced different long-term N treatments were conducted to detect effects of N-mediated changes in soil microbes on priming effects. We found strong evidence and a mechanistic explanation for alteration of SOC pools following 10 years of N enrichment with different chemical forms. We detected significant negative priming effects both in soils collected from ammonium-addition plots and in sterilized soils inoculated with soil microbes extracted from ammonium-addition plots. In contrast, significant positive priming effects were found both in soils collected from nitrate-addition plots and in sterilized soils inoculated with soil microbes extracted from nitrate-addition plots. Meanwhile, the abundance and richness of graminoids were higher and the abundance of soil microbes was lower in ammonium-addition than in nitrate-addition plots. Our findings provide evidence that shifts toward higher graminoid abundance and changes in soil microbial abundance mediated by N chemical forms are key drivers for priming effects and SOC pool changes, thereby linking human interference with the N cycle to climate change. © 2018 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/110266
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, China; Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Systems Ecology, Department of Ecological Science, Faculty of Science, Vrije Universiteit, Amsterdam, Netherlands
Recommended Citation:
Song M.,Guo Y.,Yu F.,et al. Shifts in priming partly explain impacts of long-term nitrogen input in different chemical forms on soil organic carbon storage[J]. Global Change Biology,2018-01-01,24(9)