Stoichiometry of soil microbial biomass carbon and microbial biomass nitrogen in China's temperate and alpine grasslands
Zhao, H; Sun, J; Xu, XL; Qin, XJ
2017
Source PublicationEUROPEAN JOURNAL OF SOIL BIOLOGY
ISSN1164-5563
Volume83Pages:1-8
AbstractSoil microorganisms play a key role in terrestrial ecological processes, especially in soil organic matter (SOM) formation and nutrient recycling. To perform these essential functions, microbes require mineral nutrients and labile C from the soil solution in amounts that roughly follow the Redfield ratio. However, it remains unclear how soil microorganisms maintain their C:N stoichiometry in grassland ecosystems. Here, we explored the patterns of microbial biomass C (MBC) and N (MBN), along with their controlling factors, using published data on alpine and temperate grasslands across northwestern China (from Inner Mongolia to Tibet). We tested the hypothesis that soil microbial biomass is more sensitive to climate factors than to edaphic factors. The results showed that MBC (670.0 mg kg(-1)), MBN (78.5 mg kg(-1)), and the ratio of MBC to MBN (10.9:1) in alpine grasslands were greater than in temperate grasslands (MBC = 317.4 mg kg(-1), MBN = 59.9 mg kg(-1), MBC:MBN = 6.2:1). Soil MBC in temperate grasslands had a stronger relationship with MBN (y = 0.83x - 0.33, r(2) = 0.53, p < 0.01) than in alpine grasslands (y = 0.62x + 0.09, r(2) = 0.29, p < 0.01). Climate factors were more sensitive than edaphic factors for MBC and MBN in both grasslands, but climate factors explained only 26% of the variation. These findings demonstrate that climate generally affects microbial C:N stoichiometry more strongly than do edaphic factors in alpine and temperate grasslands. However, some biotic factors could be more influential than climatic factors, necessitating further investigation. (C) 2017 Elsevier Masson SAS. All rights reserved.
SubtypeJournal
KeywordMicrobial biomass carbon Microbial biomass nitrogen Climatic factors Edaphic factors Alpine grasslands Temperate grasslands
Subject AreaEnvironmental Sciences & Ecology ; Agriculture
WOS Subject ExtendedEcology ; Soil Science
WOS KeywordCLIMATE-CHANGE ; ENVIRONMENTAL-FACTORS ; SEMIARID GRASSLAND ; TIBETAN PLATEAU ; INNER-MONGOLIA ; SURFACE SOILS ; MICROORGANISMS ; ECOSYSTEM ; PLANTS ; ROOTS
Indexed BySCI
Language英语
WOS IDWOS:000418988200001
PublisherELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43980
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Zhao, H,Sun, J,Xu, XL,et al. Stoichiometry of soil microbial biomass carbon and microbial biomass nitrogen in China's temperate and alpine grasslands[J]. EUROPEAN JOURNAL OF SOIL BIOLOGY,2017,83:1-8.
APA Zhao, H,Sun, J,Xu, XL,&Qin, XJ.(2017).Stoichiometry of soil microbial biomass carbon and microbial biomass nitrogen in China's temperate and alpine grasslands.EUROPEAN JOURNAL OF SOIL BIOLOGY,83,1-8.
MLA Zhao, H,et al."Stoichiometry of soil microbial biomass carbon and microbial biomass nitrogen in China's temperate and alpine grasslands".EUROPEAN JOURNAL OF SOIL BIOLOGY 83(2017):1-8.
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