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Soil organic carbon variation determined by biogeographic patterns of microbial carbon and nutrient limitations across a 3, 000-km humidity gradient in China

文献类型：期刊论文

作者Li, Jiwei2,3; Dong, Lingbo1; Liu, Yulin2,3; Wu, Jianzhao1; Wang, Jie1; Shangguan, Zhouping1,2,3; Deng, Lei1,2,3
刊名CATENA
出版日期2022-02-01
卷号209页码:13
关键词Climate change Soil organic carbon Ecoenzymatic stoichiometry Humidity Microbial resource limitation Soil microorganisms
ISSN号0341-8162
DOI10.1016/j.catena.2021.105849
通讯作者Deng, Lei(leideng@ms.iswc.ac.cn)
英文摘要Soil extracellular enzyme stoichiometry has been used to characterize the acquisition strategies of soil microorganisms in obtaining carbon (C), nitrogen (N) and phosphorus (P). However, the variations in soil microbial resource limitation to changing precipitation regimes and edaphic factors remain poorly understood, particularly for a highly divergent soil organic C gradient along the transect from dry to wet areas. This study investigated soil microbial C and nutrient (P/N) limitations along a 3,000-km humidity gradient. The results revealed a downward unimodal-shaped relationship between the humidity index (HI) and soil microbial P/N limitation with a threshold of HI = 0.68 (corresponding mean annual precipitation ranged from 469 mm to 551 mm). Changes in microbial C limitation, and total- and available soil P contents along the humidity gradient further revealed the presence of this threshold. Soil microbial C limitation remained constant at a humidity level below HI = 0.68, and it increased above this threshold. Microbial P limitation decreased and N limitation increased as humidity increased to HI = 0.68. Above HI = 0.68, the microbial P limitation gradually elevated with an increase in humidity. We also found that humidity and soil nutrients are critical factors explaining the variations in microbial resource limitation, and soil nutrients control microbial resource limitation on either side of the HI = 0.68 threshold. These findings suggest that the acquisition of N and P by soil microorganisms stimulates the decomposition of soil organic matter, and future predictions of ecosystem C budgets should thus consider enzymatic processes.
WOS关键词EXTRACELLULAR ENZYME-ACTIVITY ; ECOENZYMATIC STOICHIOMETRY ; PRECIPITATION GRADIENT ; P STOICHIOMETRY ; NITROGEN ; PHOSPHORUS ; RESPONSES ; COMMUNITIES ; ACQUISITION ; PROJECTIONS
资助项目National Natural Science Foundation of China[41730638] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23070201] ; Funding of Special Support Plan of Young Talents Project of Shaanxi Province ; National Forestry and Grassland Administration in China[20201326015]
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
WOS记录号WOS:000720775600016
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Funding of Special Support Plan of Young Talents Project of Shaanxi Province ; National Forestry and Grassland Administration in China
源URL[http://ir.igsnrr.ac.cn/handle/311030/168292]  
专题中国科学院地理科学与资源研究所
通讯作者Deng, Lei
作者单位1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Jiwei,Dong, Lingbo,Liu, Yulin,et al. Soil organic carbon variation determined by biogeographic patterns of microbial carbon and nutrient limitations across a 3, 000-km humidity gradient in China[J]. CATENA,2022,209:13.
APA Li, Jiwei.,Dong, Lingbo.,Liu, Yulin.,Wu, Jianzhao.,Wang, Jie.,...&Deng, Lei.(2022).Soil organic carbon variation determined by biogeographic patterns of microbial carbon and nutrient limitations across a 3, 000-km humidity gradient in China.CATENA,209,13.
MLA Li, Jiwei,et al."Soil organic carbon variation determined by biogeographic patterns of microbial carbon and nutrient limitations across a 3, 000-km humidity gradient in China".CATENA 209(2022):13.

入库方式： OAI收割

来源：地理科学与资源研究所

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