Biochar–coupled organic fertilizer reduced soil water-dispersible colloidal phosphorus contents in agricultural fields

生物炭 肥料 土壤水分 有机质 化学 吸附 肥料 有机肥料 土壤有机质 农学 环境化学 环境科学 土壤科学 有机化学 生物 热解
作者
Junwei Jin,Sangar Khan,Kamel Mohamed Eltohamy,Shuang He,Chunlong Liu,Fayong Li,Xinqiang Liang
出处
期刊:Chemosphere [Elsevier BV]
卷期号:333: 138963-138963 被引量:5
标识
DOI:10.1016/j.chemosphere.2023.138963
摘要

Soil water-dispersible colloidal phosphorus (WCP) presents high mobility, however, the regulatory effect of biochar-coupled organic fertilizer is rarely known, especially under different cropping patterns. This study investigated the P adsorption, soil aggregate stability, and WCP in three paddy and three vegetable fields. These soils were amended with different fertilizers (chemical fertilizer, CF; substitution of solid-sheep manure or liquid-biogas slurry organic fertilizer, SOF/LOF; substitution of biochar-coupled organic fertilizers, BSOF/BLOF). Results presented that the LOF averagely increased the WCP contents by 50.2% across the sites, but the SOF and BSOF/BLOF averagely decreased their contents by 38.5% and 50.7% in comparison with the CF. The WCP decline in the BSOF/BLOF-amended soils was mainly attributed to the intensive P adsorption capacity and soil aggregate stability. The BSOF/BLOF increased the amorphous Fe and Al contents in the fields in comparison with the CF, which improved the adsorption capacity of soil particles, further improving the maximum absorbed P (Qmax) and reducing the dissolved organic matter (DOC), leading to the improvement of > 2 mm water-stable aggregate (WSA>2mm) and subsequent WCP decrease. This was proved by the remarkable negative associations between the WCP and Qmax (R2 = 0.78, p < 0.01) and WSA>2mm (R2 = 0.74, p < 0.01). This study manifests that biochar-coupled organic fertilizer could effectively reduce soil WCP content via the improvement of P adsorption and aggregate stability.
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