数字农科院2.0

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： 外文期刊

作者： Hao Chen;Liwen Lin;Quan Shi;Jianshuang Wu;Fei Wang;Mukan Ji;Qimei Lin;Xianzhou Zhang;Yong Guan Zhu;Chao Liang;Weidong Kong

作者机构：

关键词： Carbon loss;Degradability;Grassland soil;Grazing;Organic matter decomposition;Soil water-extractable organic matter

期刊名称： Catena

ISSN： 0341-8162

年卷期： 2025 年 259 卷

页码：

收录情况： SCIE（2025版）

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.

分类号：

  • 相关文献

[1]西部草地荒漠化治理与鼠害控制. 侯希贤,董维惠. 2002

[2]亚热带山地牧压和肥力对草地植物组分的影响. 李向林,白静仁,韩雪松,万里强. 2002

[3]Soil biophysical controls over rice straw decomposition and sequestration in soil: The effects of drying intensity and frequency of drying and wetting cycles. Yao, Shui-Hong,Zhang, Bin,Zhang, Bin,Yao, Shui-Hong,Hu, Feng.

[4]Biochar combined with ferrous sulfate reduces nitrogen and carbon losses during agricultural waste composting and enhances microbial diversity. Peizhen Chen,Xiangqun Zheng,Weimin Cheng. 2022

[5]Effects of dynamic flow rates on degradation deposition behavior of Mg scaffold. Jia, Gaozhi,Zhou, Meng,Huang, Yicong,Chen, Chenxin,Jin, Liang,Wu, Qian,Weng, Jian,Yu, Fei,Xiong, Ao,Yuan, Guangyin,Feyerabend, Frank,Zeng, Hui. 2023

[6]Patterns and drivers of the degradability of dissolved organic matter in dryland soils on the Tibetan Plateau. Chen, Hao,Kong, Weidong,Shi, Quan,Wang, Fei,He, Chen,Wu, Jianshuang,Lin, Qimei,Zhang, Xianzhou,Zhu, Yong-Guan,Liang, Chao,Luo, Yu. 2021

[7]Thickness-dependent release of microplastics and phthalic acid esters from polythene and biodegradable residual films in agricultural soils and its related productivity effects. Aimee Grace Uzamurera,Peng Yang Wang,Ze Ying Zhao,Xiu Ping Tao,Rui Zhou,Wen Ying Wang,Xiao Bin Xiong,Song Wang,Kiprotich Wesly,Hong Yan Tao,You Cai Xiong. 2023

[8]Effects of Livestock Exclusion on Soil Physical and Biochemical Properties of a Desert Rangeland. Qin, Yan,Li, Xianglin,Qin, Yan,Qin, Yan,Niu, Decao,Kang, Jian,Zhou, Yanfei,Kang, Jian. 2015

[9]Effects of cattle grazing on small mammal communities in the Hulunber meadow steppe. Cao, Chan,Shuai, Ling-Ying,Song, Yan-Ling,Zeng, Zhi-Gao,Cao, Chan,Xin, Xiao-Ping,Liu, Zhi-Tao. 2016

[10]Impact of Climate and Grazing on Biomass Components of Eastern Russia Typical Steppe. Leonid, Ubugunov,Yuriy, Rupyshev,Vasiliy, Ubugunov,Oxana, Vishnyakova,Irina, Lavrentieva,Vera, Ubugunova,Hou Xiang-yang,Ren Wei-bo,Ding Yong. 2014

[11]Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau. Jiang, Lili,Wang, Shiping,Luo, Caiyun,Zhang, Zhenhua,Wang, Shiping,Xu, Xingliang,Kuzyakov, Yakov,Zhong, Lei,Kardol, Paul,Yu, Qiang,Wang, Changshun,Lan, Zhichun,Zhe, Pang,Wang, Yanfen,Kuzyakov, Yakov,Jones, Davey L..

[12]Effect of grazing on the abundance of functional genes associated with N cycling in three types of grassland in Inner Mongolia. Ding, K.,Liu, W. J.,Tang, L.,Wang, Y. F.,Zhong, L.,Xin, X. P.,Xu, Z. H.,Kang, X. M.,Rui, Y. C.,Jiang, L. L.. 2015

[13]Carbon Storage under Different Grazing Management in the Typical Steppe. Sarula,Chen, Haijun,Hou, Xiangyang,Wu, Xinhong,Ren, Weibo,Ding, Yong,Ubugunov, Leonid,Vishnyakova, Oksana.

[14]Equations to predict methane emissions from cows fed at maintenance energy level in pasture-based systems. Stergiadis, Sokratis,Zou, Caixia,Chen, Xianjiang,Wills, David,Yan, Tianhai,Stergiadis, Sokratis,Zou, Caixia,Chen, Xianjiang,Allen, Michelle.

[15]Growth performance and rumen microorganism differ between segregated weaning lambs and grazing lambs. Ji Shou-kun,Jiang Cheng-gang,Diao Qi-yu,Tu Yan,Zhang Nai-feng,Si Bing-wen,Li Rui. 2016

[16]Effect Of Grazing On Methane U.ptake From Eurasian Steppe O f China. Tang, SM, Zhang, YJ, Zhai, XJ, Wilkes, A, Wang, CJ, Wang, K. 2018

[17]Effect of a Dairy Cow’s Feeding System on the Flavor of Raw Milk: Indoor Feeding or Grazing. Xuelu Chi,Ning Yuan,Yangdong Zhang,Nan Zheng,Huimin Liu. 2023

[18]Grazing Modulates Soil Temperature And M.oisture In A Eurasian S teppe. Yan, YC, Yan, RR, Chen, JQ, Xin, XP, Eldridg, DJ, Shao, CL, Wang, X, Lv, SJ, Jin, DY, Chen, JQ, Guo, ZJ, Chen, BR, Xu, LJ. 2018

[19]Differential Responses Of Soil Microbial C.ommunity To Four-Decade Long G razing And Cultivation In A Semi-Arid Grassland. He, YT, Xu, MG, Qi, YC, Dong, YS, He, XH, Li, JW, Liu, XC, Sun, LJ. 2017

[20]Positive microbial legacy and short-term clonal plasticity aid grazing tolerance of a widespread grass species. 李西良,Png, G. Kenny,孙世贤,石红霄,金轲,李元恒. 2022

作者其他论文 更多>>