Exogenous Carbon Type Determines the Structure and Stability of Soil Organic Carbon in Dryland Farmlands Under a Continental Semi-Arid Climate

文献类型： 外文期刊

第一作者： Qi, Huanjun

作者： Qi, Huanjun;Wang, Jian;Qi, Huanjun;Lei, Jinyin;He, Jinqin;Lei, Xiaoting;Jin, Jianxin;Zhou, Lina;Qi, Huanjun;Lei, Jinyin;He, Jinqin;Lei, Xiaoting;Jin, Jianxin;Zhou, Lina

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关键词： corn straw; fermented cattle manure; chemical structure of organic carbon; exogenous carbon addition; dryland farmlands

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

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年卷期： 2025 年 15 卷 6 期

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收录情况： SCI

摘要： The effects of different exogenous carbon types on the chemical structural characteristics and stability of soil organic carbon in dryland farmland remain unclear. Based on a four-year fixed-site experiment in a typical dryland farmland on China's Loess Plateau, this study systematically analyzed the impacts of different carbon sources on soil enzyme activities, organic carbon content, chemical structural characteristics, and their interrelationships under five treatments: (i) no fertilization (T-0); (ii) 100% chemical nitrogen, phosphorus, and potassium fertilizers (CK); (iii) 50% CK + fermented cattle manure (T-1); (iv) 50% CK + corn straw (T-2); (v) 50% CK + mixed fermented cattle manure/corn straw (T-3). The results showed that the activities of beta-glucosidase and N-acetylglucosidase ranked in the order T-1 > T-2 > T-3 and T-3 > T-2 > T-1, respectively. Specifically, beta-glucosidase activity under T-1 increased by 35.26% compared to CK, while N-acetylglucosidase activity under T-3 increased by 30.78% relative to CK. Compared to CK, the T-1, T-2, and T-3 treatments increased soil organic carbon by 26.84%, 11.27%, and 18.63%, and alkyl carbon content by 7.67%, 2.91%, and 5.57%, respectively. Additionally, T-1 and T-3 treatments elevated aromatic carbon content by 20.59% and 176.47% relative to CK. The organic carbon activity index under T-1 was the lowest, decreasing by 10.04% compared to CK. Structural equation modeling (SEM) path analysis revealed that the addition of different exogenous carbon sources in dryland farming primarily influenced the structure and stability of soil organic carbon by directly or indirectly enhancing the activities of glucosidase, beta-acetylglucosidase, and alkaline phosphatase, with T-1 demonstrating the most significant improvement.

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