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Responses of soil organic carbon cycle to land degradation by isotopically tracing in a typical karst area, southwest China

文献类型：期刊论文

作者Han, Ruiyin3,4; Zhang, Qian2; Xu, Zhifang1,3,4
刊名PEERJ COMPUTER SCIENCE
出版日期2023-05-15
卷号11页码:20
关键词Soil organic carbon Stable carbon isotope Land management Karst soils Isotopic tracing
DOI10.7717/peerj.15249
英文摘要Background. The loss of soil organic carbon (SOC) under land degradation threatens crop production and reduces soil fertility and stability, which is more reflected in eco-sensitive environments. However, fewer studies simultaneously compared SOC variations and 813CSOC compositions under diverse land uses, especially in karst areas.Methods. Soil profiles from two agricultural lands and a secondary forest land were selected to analyze SOC contents and their stable isotope composition (813CSOC) in a typical karst area located in southwest China to understand the response of the SOC cycle to land degradation. Moreover, the relationships between SOC contents and mean weight diameter (MWD) and soil erodibility (K) factor were comprehensively analyzed for assessing the response of SOC to soil degradation risk.Results. The mean SOC content was found to be the lowest in abandoned cropland (6.91 g/kg), followed by secondary forest land (9.31 g/kg) and grazing shrubland (34.80 g/kg), respectively. Meanwhile, the 813CSOC values exhibited the following trend: secondary forest land (mean: -23.79%o) approximate to abandoned cropland (mean: -23.76%o) >shrubland (mean: -25.33%o). The isotopic tracing results suggested that plant litter was the main contributor to SOC in the secondary forest land. Whereas abundant nitrogen from goat feces enhanced plant productivity and resulted in additional accumulation of SOC in the grazing shrubland. Conversely, long-term cultivation led to the depletion of SOC sequestration by the loss of calcium. In surface soils, the fractionation of 813CSOC were considerably affected by the decomposition of SOC by soil microorganisms and covered vegetation rather than agricultural influences.Conclusions. The findings indicate that the cycling of SOC and soil stability in the calcareous soil of southwest China are largely regulated by different land uses and the presence of vegetation cover. The depletion of SOC and soil physical degradation pose significant challenges for abandoned cropland, particularly in the karst area, where land degradation is inevitable. Nevertheless, moderate grazing enhances SOC levels, which is beneficial to the land fertility maintenance in the karst region. Therefore, more emphasis should be placed on the cultivation methods and management strategies for abandoned cropland in the karst area.
WOS关键词LOESS PLATEAU ; CLIMATE-CHANGE ; ISOTOPE FRACTIONATION ; AGGREGATE FRACTIONS ; TOTAL NITROGEN ; VEGETATION ; ERODIBILITY ; DYNAMICS ; EROSION ; IMPACT
资助项目National Key Research and Development Program of China[2020YFA0607700] ; "Strategic Priority Research Program"of the Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41730857] ; National Natural Science Foundation of China[42203011] ; National Natural Science Foundation of China[42273050]
WOS研究方向Computer Science
语种英语
WOS记录号WOS:000996333000003
出版者PEERJ INC
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; "Strategic Priority Research Program"of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/110959]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Xu, Zhifang
作者单位1.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Han, Ruiyin,Zhang, Qian,Xu, Zhifang. Responses of soil organic carbon cycle to land degradation by isotopically tracing in a typical karst area, southwest China[J]. PEERJ COMPUTER SCIENCE,2023,11:20.
APA Han, Ruiyin,Zhang, Qian,&Xu, Zhifang.(2023).Responses of soil organic carbon cycle to land degradation by isotopically tracing in a typical karst area, southwest China.PEERJ COMPUTER SCIENCE,11,20.
MLA Han, Ruiyin,et al."Responses of soil organic carbon cycle to land degradation by isotopically tracing in a typical karst area, southwest China".PEERJ COMPUTER SCIENCE 11(2023):20.

入库方式： OAI收割

来源：地质与地球物理研究所

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