DOI: 10.1111/gcb.14777
论文题名: Increased microbial growth, biomass, and turnover drive soil organic carbon accumulation at higher plant diversity
作者: Prommer J. ; Walker T.W.N. ; Wanek W. ; Braun J. ; Zezula D. ; Hu Y. ; Hofhansl F. ; Richter A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 2 语种: 英语
英文关键词: microbial activity
; microbial carbon use efficiency
; microbial necromass
; microbial turnover
; plant diversity
; soil organic carbon
Scopus关键词: biomass
; carbon cycle
; energy efficiency
; growth response
; microbial activity
; soil organic matter
; species diversity
; Germany
; Jena
; Thuringia
; Embryophyta
; Poaceae
英文摘要: Species-rich plant communities have been shown to be more productive and to exhibit increased long-term soil organic carbon (SOC) storage. Soil microorganisms are central to the conversion of plant organic matter into SOC, yet the relationship between plant diversity, soil microbial growth, turnover as well as carbon use efficiency (CUE) and SOC accumulation is unknown. As heterotrophic soil microbes are primarily carbon limited, it is important to understand how they respond to increased plant-derived carbon inputs at higher plant species richness (PSR). We used the long-term grassland biodiversity experiment in Jena, Germany, to examine how microbial physiology responds to changes in plant diversity and how this affects SOC content. The Jena Experiment considers different numbers of species (1–60), functional groups (1–4) as well as functional identity (small herbs, tall herbs, grasses, and legumes). We found that PSR accelerated microbial growth and turnover and increased microbial biomass and necromass. PSR also accelerated microbial respiration, but this effect was less strong than for microbial growth. In contrast, PSR did not affect microbial CUE or biomass-specific respiration. Structural equation models revealed that PSR had direct positive effects on root biomass, and thereby on microbial growth and microbial biomass carbon. Finally, PSR increased SOC content via its positive influence on microbial biomass carbon. We suggest that PSR favors faster rates of microbial growth and turnover, likely due to greater plant productivity, resulting in higher amounts of microbial biomass and necromass that translate into the observed increase in SOC. We thus identify the microbial mechanism linking species-rich plant communities to a carbon cycle process of importance to Earth's climate system. © 2019 The Authors. Global Change Biology published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159817
Appears in Collections: 气候变化与战略
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作者单位: Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria; Department of Ecology and Evolution, Université de Lausanne, Lausanne, Switzerland; The Scottish Association for Marine Science, Oban, United Kingdom; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; International Institute for Applied Systems Analysis, Laxenburg, Austria
Recommended Citation:
Prommer J.,Walker T.W.N.,Wanek W.,et al. Increased microbial growth, biomass, and turnover drive soil organic carbon accumulation at higher plant diversity[J]. Global Change Biology,2020-01-01,26(2)