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Long-term cereal-legume intercropping accelerates soil organic carbon loss in subsoil of dryland

文献类型： 外文期刊

作者： Wang, Wei 1 ; Chen, Guang-Rong 2 ; Li, Meng-Ying 1 ; Chen, Yinglong 3 ; Wang, Yang 1 ; Tao, Hong-Yan 1 ; Hou, Hui-Zhi 2 ; Rehman, Muhammad Maqsood Ur 1 ; Ashraf, Muhammad 5 ; Song, Yajie 6 ; Kavagi, Levis 7 ; Wang, Bao-Zhong 1 ; Xiong, You-Cai 1 ;

作者机构： 1.Lanzhou Univ, Coll Ecol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou 730000, Peoples R China

2.Gansu Acad Agr Sci, Inst Dryland Agr, Lanzhou 730070, Peoples R China

3.Univ Western Australia, UWA Inst Agr, Perth, WA 6001, Australia

4.Univ Western Australia, Sch Agr & Environm, Perth, WA 6001, Australia

5.Univ Lahore, Inst Mol Biol & Biotechnol, Lahore 54000, Pakistan

6.Global Inst Ecoenvironm Sustainable Dev GIESD, 40 Pleasant St, New Haven, CT 06511 USA

7.United Nations Environm Programme, Div Ecosyst & Biodivers, Nairobi 00100, Kenya

关键词： Cereal-legume intercropping; Soil organic carbon; Subsoil; Land use efficiency; Sustainability risk; Dryland agroecosystem

期刊名称：RESOURCES CONSERVATION AND RECYCLING （ 影响因子：10.9； 五年影响因子：12.7 ）

ISSN： 0921-3449

年卷期： 2024 年 211 卷

页码：

收录情况： SCI

摘要： Subsoils are important reservoirs affecting soil organic carbon (SOC). However, little is known about the factors controlling SOC pools in subsoils, and the response of SOC stability to sustainable cropping patterns (e.g., intercropping) remains to be determined. A 10-year experimental field experiment data indicated that cereal-legume intercropping improved net yield gain averagely by 2.2-4.9 t ha-1. SOC storage increased in the topsoil but declined significantly by 5.3% in the subsoil. The increase in soil nitrogen (13.3%) across soil profile resulted in 14.5% decrease in soil C/N. Unexpectedly, microbial growth was evidently stimulated, thereby accelerating SOC decomposition. Interestingly, this process also contributed to the stability of the existing SOC pool. Our results suggest that the adoption of intercropping indeed can improve land use efficiency at a relatively long time scale, but its functional role in subsoil C storage and stability needs to be reconsidered.

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