DOI: 10.1111/gcb.12348
论文题名: Nitrogen deposition weakens plant-microbe interactions in grassland ecosystems
作者: Wei C. ; Yu Q. ; Bai E. ; Lü X. ; Li Q. ; Xia J. ; Kardol P. ; Liang W. ; Wang Z. ; Han X.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 12 起始页码: 3688
结束页码: 3697
语种: 英语
英文关键词: Aboveground-belowground linkages
; Compensatory effects
; Microbial carbon limitation
; N saturation
; Resource stoichiometry
; Structural equation modeling
Scopus关键词: aboveground biomass
; belowground biomass
; dissolved organic carbon
; grassland
; microbial community
; nitrogen
; numerical model
; soil organic matter
; stoichiometry
; terrestrial ecosystem
; carbon
; nitrogen
; aboveground-belowground linkages
; article
; chemistry
; China
; compensatory effects
; environment
; metabolism
; microbial carbon limitation
; microbiology
; N saturation
; plant physiology
; resource stoichiometry
; soil
; structural equation modeling
; aboveground-belowground linkages
; compensatory effects
; microbial carbon limitation
; N saturation
; resource stoichiometry
; structural equation modeling
; Carbon
; China
; Environment
; Nitrogen
; Plant Physiological Phenomena
; Soil
; Soil Microbiology
英文摘要: Soil carbon (C) and nitrogen (N) stoichiometry is a main driver of ecosystem functioning. Global N enrichment has greatly changed soil C : N ratios, but how altered resource stoichiometry influences the complexity of direct and indirect interactions among plants, soils, and microbial communities has rarely been explored. Here, we investigated the responses of the plant-soil-microbe system to multi-level N additions and the role of dissolved organic carbon (DOC) and inorganic N stoichiometry in regulating microbial biomass in semiarid grassland in northern China. We documented a significant positive correlation between DOC and inorganic N across the N addition gradient, which contradicts the negative nonlinear correlation between nitrate accrual and DOC availability commonly observed in natural ecosystems. Using hierarchical structural equation modeling, we found that soil acidification resulting from N addition, rather than changes in the plant community, was most closely related to shifts in soil microbial community composition and decline of microbial respiration. These findings indicate a down-regulating effect of high N availability on plant-microbe interactions. That is, with the limiting factor for microbial biomass shifting from resource stoichiometry to soil acidity, N enrichment weakens the bottom-up control of soil microorganisms by plant-derived C sources. These results highlight the importance of integratively studying the plant-soil-microbe system in improving our understanding of ecosystem functioning under conditions of global N enrichment. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62272
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110164, China; Department of Biology, Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO, 80523, United States; Department of Botany and Microbiology, University of Oklahoma, Norman, OK, United States; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, 901 83, Sweden
Recommended Citation:
Wei C.,Yu Q.,Bai E.,et al. Nitrogen deposition weakens plant-microbe interactions in grassland ecosystems[J]. Global Change Biology,2013-01-01,19(12)