Effects of Residue Returning on Soil Organic Carbon Storage and Sequestration Rate in China's Croplands: A Meta-Analysis
文献类型： 外文期刊
作者： Wang, Xudong 1 ; He, Cong 1 ; Liu, Bingyang 1 ; Zhao, Xin 1 ; Liu, Yang 2 ; Wang, Qi 3 ; Zhang, Hailin 1 ;
作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Minist Agr & Rural Affairs China, Key Lab Farming Syst, Beijing 100193, Peoples R China
2.Liaoning Acad Agr Sci, Shenyang 110161, Peoples R China
3.Heilongjiang Acad Agr Sci, Inst Crop Cultivat & Tillage, Harbin 150086, Peoples R China
关键词： residue returning; SOC storage; SOC sequestration rate; meta-analysis
期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）
ISSN：
年卷期： 2020 年 10 卷 5 期
页码：
收录情况： SCI
摘要： Crop residue returning (RR) is a promising option to increase soil organic carbon (SOC) storage, which is linked to crop yield promotion, ecologically sustainable agriculture, and climate change mitigation. Thus, the objectives of this study were to identify the responses of SOC storage and sequestration rates to RR in China's croplands. Based on a national meta-analysis of 365 comparisons from 99 publications, the results indicated that RR increased SOC storage by 11.3% compared to residue removal (p < 0.05). Theoretically, when combined with low nitrogen fertilizer input rates (0-120 kg N ha(-1)), single cropping system, paddy-upland rotation, lower mean annual precipitation (0-500 mm), alkaline soils (pH 7.5-8.5), other methods of RR (including residue chopping, evenly incorporating, and burying) or long-term use (>10 yrs), an increase in SOC storage under RR by 11.6-15.5% could be obtained. The SOC sequestration rate of RR varied from 0.48 (Central China) to 1.61 (Southwest China) Mg C ha(-1) yr(-1), with a national average value of 0.93 Mg C ha(-1) yr(-1). Higher SOC sequestration rates enhanced crop production. However, decreases in SOC sequestration rate were observed with increases in experimental durations. The phenomenon of "C saturation" occurred after 23 yrs of RR. Overall, RR can be used as an efficient and environmentally friendly and climate-smart management practice for long-term use.
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