数字农科院2.0

Building Up The Soil Carbon P.ool Via The Cultivation O f Green Manure Crops In The Loess Plateau Of China

文献类型： 外文期刊

作者： Zhang, DB; Yao, PW; Zhao, N; Cao, WD; Zhang, SQ; Li, YY; Huang, DL; Zhai, BN; Wang, ZH; Gao, YJ

作者机构：

关键词： Leguminous green manure; Soil carbon sequestration; One-compartment model; Soil carbon dynamic; Dryland conditions

期刊名称： GEODERMA

ISSN： 0016-7061

年卷期： 2019 年 337 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： The growth of summer legumes as green manures (GM) may influence the soil C pool, thereby affecting soil quality and productivity in a traditional cropping system. However, there is a lack of research on whether the inclusion of GM crops enhances the C economy under semiarid conditions. An ongoing field experiment was conducted on Cumulic Haplustoll in the northwest region of China to (i) quantify the biomass C release patterns of three GM legumes; (ii) evaluate the effect of the GM legumes on the soil organic carbon (SOC) stock (0-20 cm depth), and (iii) estimate the soil C dynamics for the GM systems under semiarid conditions in more detail. The results showed that the percentages of the remaining GM C in the soil after one year of decomposition averaged 26% and 33% for the above-ground and below-ground residues, respectively. Thus, the 5-yr growth of GM legumes continuously significantly improved the SOC and easily oxidized organic carbon (EOOC) concentrations, as well as the corresponding stocks (except for soybean) (P < 0.01), compared with the original soil at the 0-20 cm depth. We estimated the annual decomposition rate of SOC as 1%, and the C added by the crops that remained in the SOC as 23% each year using the one-compartment model. The mean turnover time of the SOC at equilibrium was estimated to be 22 years, indicating that the loess soil was not C saturated and still had the potential for C sequestration. In general, Huai bean performed better on biomass production, C accumulation, and soil C sequestration than mung bean and soybean under the dryland conditions during the 5-yr period of this study. Consequently, the cultivation of leguminous GM during the summer is a better option than bare fallow to improve the soil fertility and environmental sustainability not only in the Loess Plateau of China but also in other similar dryland regions.

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