数字农科院2.0

Long-term effects of biochar and nitrogen fertilizer on soil carbon and nitrogen profiles in paddy soils

文献类型： 外文期刊

作者： Bao, Xuan;Lu, Yang;Sun, Baoru;Zhang, Fangbo;Hou, Yuxue;Li, Hongbo;Tang, Xiaoyan;Jin, Kemo

作者机构：

期刊名称： AGRONOMY JOURNAL

ISSN： 0002-1962

年卷期： 2025 年 117 卷 5 期

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收录情况： SCIE（2025版）

摘要： The effects of biochar and nitrogen (N) fertilization on soil carbon (C) and nitrogen (N) have been primarily studied in topsoil layers (0-30 cm), leaving a gap in understanding their long-term impact on deeper soil layers. This study investigates the effects of biochar (0 (B0) and 9 t ha(-1) year(-1) (B+)) and nitrogen fertilization (0 (N0) and 300 kg N ha(-1) year-1 (N+)) on soil organic carbon (SOC), soil organic nitrogen (SON), microbial biomass carbon, and microbial biomass nitrogen down to 150 cm. The study was conducted over 8 years in a rice field in northwest China. Results showed that biochar application increased total SOC by 27.0% and 12.2%, with and without nitrogen fertilization, respectively. Approximately 43.5%-51.8% of SOC was stored in the top 30 cm, while significant portions were found in deeper layers, indicating substantial carbon movement beyond the surface soil. Biochar also significantly increased SON in the 105- to 150-cm depth, regardless of N fertilization. These results suggest that failing to consider deep soil layers could lead to underestimations of soil C and N storage in paddy systems. The findings highlight the importance of biochar and nitrogen fertilization for improving carbon sequestration and nutrient cycling in rice paddies, offering insights into sustainable soil management practices.

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