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Grazing accelerates soil carbon loss by enhancing the degradability of soil water-extractable organic matter and microbial turnover in fragile grasslands

文献类型：期刊论文

作者Chen, Hao9,10; Lin, Liwen10; Shi, Quan8; Wu, Jianshuang6,7; Wang, Fei9,11; Ji, Mukan9; Lin, Qimei1; Zhang, Xianzhou6; Zhu, Yong-Guan2; Liang, Chao5
刊名CATENA
出版日期2025-11-01
卷号259页码:109346
关键词Grazing Soil water-extractable organic matter Degradability Organic matter decomposition Carbon loss Grassland soil
ISSN号0341-8162
DOI10.1016/j.catena.2025.109346
产权排序5
文献子类Article
英文摘要The decrease in soil organic matter (SOM) induced by grazing may be primarily due to reduced plant litter inputs. However, the grazing effects on SOM molecular compositions that control its decomposition by microbes are not well understood. Herein we investigated the molecular composition of soil water-extractable organic matter (WEOM, representing the soluble part of SOM), and the associated microbial metabolisms in grassland soils on the Tibetan Plateau. The paired fields (i.e., grazed versus non-grazed) had been established for ten years at eight sites, covering ecologically fragile grasslands on the plateau. The results demonstrated that grazing substantially changed the soil WEOM compositions by enhancing the number and relative abundance of labile C molecules, including lipids and proteins. Subsequently, grazing increased WEOM degradability index by 26.3 % (0.48 vs. 0.38), and enhanced predicted microbial metabolisms degrading labile compounds (i.e., lipid, amino acid, and carbohydrate). Consistently, grazing increased microbial biomass C (MBC) (1.3 folds higher, 298.4 vs. 232.3 mg kg- 1) (all P < 0.001), and its proportion to the SOC pool (1.5 folds higher, 0.020 vs. 0.013), indicating that grazing strengthened the microbial pathway of SOM transformation processes. These observed increases of soil WEOM degradability and microbial decomposing capacity coincided with the grazing-induced reduction of SOM by 25.9 % (P < 0.001), and the effects were positively correlated with the grazing intensity across grassland types. We conclude that grazing can accelerate soil C loss by enhancing WEOM degradability and directly facilitating the metabolism of soil microbes degrading labile organic compounds. This study provides a novel insight into the soil C cycling under human disturbances in fragile grasslands.
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WOS关键词LAND-USE CHANGE ; DEGRADATION ; RESPONSES ; DYNAMICS ; STABILIZATION ; COMMUNITIES ; PERSISTENCE ; INTENSITY ; EXCLUSION ; BIOMASS
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
WOS记录号WOS:001545964200002
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/215561]  
专题拉萨站高原生态系统研究中心_外文论文
通讯作者Kong, Weidong
作者单位1.China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China;
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing, Peoples R China;
3.Capital Normal Univ, Coll Life Sci, 105 West Third Ring Rd North, Beijing 100048, Peoples R China;
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China;
6.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China;
7.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China;
8.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;
9.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Resources, Beijing 100101, Peoples R China;
10.Sun Yat Sen Univ, Sch Agr & Biotechnol, State Key Lab Biocontrol, Guangdong Prov Key Lab Plant Stress Biol, Shenzhen Campus, Shenzhen 518107, Guangdong, Peoples R China;
推荐引用方式
GB/T 7714		 Chen, Hao,Lin, Liwen,Shi, Quan,et al. Grazing accelerates soil carbon loss by enhancing the degradability of soil water-extractable organic matter and microbial turnover in fragile grasslands[J]. CATENA,2025,259:109346.
APA Chen, Hao.,Lin, Liwen.,Shi, Quan.,Wu, Jianshuang.,Wang, Fei.,...&Kong, Weidong.(2025).Grazing accelerates soil carbon loss by enhancing the degradability of soil water-extractable organic matter and microbial turnover in fragile grasslands.CATENA,259,109346.
MLA Chen, Hao,et al."Grazing accelerates soil carbon loss by enhancing the degradability of soil water-extractable organic matter and microbial turnover in fragile grasslands".CATENA 259(2025):109346.

入库方式： OAI收割

来源：地理科学与资源研究所

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