Biochar effects on soil aggregation, phosphorus distribution, and colloidal phosphorus content in paddy soils: a comparative study

文献类型： 外文期刊

第一作者： Wei, Jinju

作者： Wei, Jinju;Qin, Guobing;Zeng, Qingyang;Luo, Qi;Yan, Xiao;Wu, Jianfu;Wei, Zongqiang;Qin, Guobing;Ji, Jianhua

作者机构：

关键词： Biochar; Soil aggregation; Soil colloids; Phosphorus; Paddy soil

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Purpose Soil colloids significantly influence the transfer of phosphorus (P) from agricultural lands to aquatic ecosystems. Nevertheless, the impact of soil amendments, such as biochar, on colloidal P release and mobilization is not fully understood. This study aimed to explore how biochar amendments affect the dynamics of soil colloidal P in paddy soils, particularly focusing on the interaction between soil aggregation and colloidal P mobilization. Materials and methods We conducted a soil incubation experiment to investigate the effects of rape straw-derived biochar (SBC) and chicken manure-derived biochar (MBC) on soil aggregate stability, P distribution, and colloidal P content in paddy soils with different fertility levels. Soil aggregates were fractionated using wet sieving and sedimentation methods, whereas colloidal P was determined through ultracentrifugation. Results and discussion Our findings demonstrated that both MBC and SBC addition increased soil aggregation by promoting the formation of larger aggregates (> 250 mu m and 53-250 mu m), while reducing the proportion of smaller soil aggregates (< 2 mu m, 2-20 mu m, and 20-53 mu m). Biochar addition led to an increased allocation of P in soil aggregates of > 250 mu m and 53-250 mu m, with the observed rise in total P content primarily attributed to the inherent P within the added biochar. MBC exhibited a more pronounced impact on soil P dynamics than SBC. Despite enhanced soil aggregation, MBC addition substantially increased soil colloidal P and dissolved P, suggesting potential environmental risks associated with P loss. The elevated degree of P saturation resulting from MBC addition appeared to play a more critical role in regulating soil colloidal P release and mobilization. Conclusion Our study highlights the importance of carefully considering the long-term application of P-enriched biochar in paddy soils, as this practice may lead to P loss even in the presence of increased soil aggregate stability.

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