Soil organic matter enhanced the soil colloidal phosphorus via co-precipitation with Fe/Al in paddy soil

文献类型： 外文期刊

第一作者： Li, Jing

作者： Li, Jing;Xue, Lihong;Li, Jing;Xue, Lihong;Hu, Xin;Shi, Linlin

作者机构：

关键词： Colloidal phosphorus; Organic fertilizer; Organic carbon; Co-precipitates; Paddy soil

期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS （ 影响因子：5.4； 五年影响因子：5.2 ）

ISSN： 0927-7757

年卷期： 2025 年 717 卷

页码：

收录情况： SCI

摘要： Owing to their unique surface properties and instability, soil colloids play important roles in phosphorus (P) migration and loss from agricultural soils. The composition of soil organic matter (SOM) in colloids mediates their association with minerals, which can influence the immobilization of P. Fertilization, as a vital agricultural management practice, not only changes the material composition of farmland soil but also significantly influences the properties and release patterns of soil colloids. The aim of this study was to investigate the effect of SOM on the morphology and content of metal minerals in soil colloids and to explore the differences in the binding mode among SOM, metals, and P and its leaching risk under different fertilization treatments. The content of soil colloidal P under organic fertilizer treatments was 1.3-2.9 times higher than that under inorganic treatments. Soil colloids under organic fertilizer treatments had high organic carbon contents, with a high proportion of aromatic and carboxy carbons. The carboxyl-rich SOM was adsorbed and occluded the interstices of metal crystals, thus inhibiting the transformation into a more crystalline metal. This led to a 1.25-1.70-fold increase in the contents of amorphous Fe and Al (Feox and Alox) in soil colloids. Feox and Alox have more binding sites and can coprecipitate with SOM and P to increase the colloidal P content. Higher colloidal P leaching loss was observed in the organic fertilizer treatments, and the colloidal P concentration in the leachates was significantly correlated with the TOCcoll, Fecoll, and Alcoll concentrations. The reductive dissolution of Fe under anoxic conditions and ion exchange due to an increase in pH are the main factors for colloidal P release. This study suggests that attention should be paid to the risk of colloidal P loss caused by long-term organic fertilizer application.

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