The Effects of Different Straw-Returning Methods on Soil Organic Carbon Transformation in Rice-Rape Rotation Systems

文献类型： 外文期刊

第一作者： Hu, Lening

作者： Hu, Lening;Ge, Yujiao;Zhou, Liming;Li, Anyu;Deng, Hua;Hu, Lening;Ge, Yujiao;Zhou, Liming;Li, Anyu;Deng, Hua;Li, Zhongyi;He, Tieguang

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关键词： rice-rape rotation; straw returning; biochar returning; soil organic carbon

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.6； 五年影响因子：3.8 ）

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年卷期： 2025 年 15 卷 14 期

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收录情况： SCI

摘要： Effective management of straw in rice (Oryza sativa L.)-rape (Brassica napus L.) rotation systems is essential for optimising resource efficiency and improving soil quality. This two-year study investigated the impact of seven straw treatment methods on soil organic carbon (SOC) dynamics. The treatments examined were as follows: (1) control (CK); (2) rice straw (SF); (3) rapeseed straw (YF); (4) rice-straw-derived biochar (SB); (5) rapeseed-straw-derived biochar (YB); (6) mixed straw (YSF); (7) mixed biochar (YSB). Soil properties, enzyme activities and carbon fractions were subsequently analysed. During the canola growing season, the application of rice straw biochar increased oxidisable carbon (ROC), dissolved organic carbon (DOC) and microbial biomass carbon (MBC) by 25.7%, 61.7% and 67.2%, respectively, compared to the control. Notably, SB was more effective than unprocessed rice straw (SF) at increasing SOC and ROC. Furthermore, SB demonstrated superior performance in enhancing ROC (56.4%), MBC (36.0%) and DOC (12.2%) compared to hybrid biochar (YSB). SB consistently exhibited a higher carbon accumulation trend than the rapeseed-derived treatments (YF, YB and YSB). The results of the study indicated that applying rice straw biochar during the oilseed rape growing season was effective in increasing variable carbon pools and soil organic carbon accumulation.

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