Impact of modified biochar on phosphorus fractionation and biochemical properties for different soils

文献类型： 外文期刊

第一作者： Khan, Muhammad Numan

作者： Khan, Muhammad Numan;Liu, Wenjie;Singh, Ashutosh Kumar;Zhu, Xiai;Khan, Muhammad Numan;Huang, Jing;Shah, Asad;Hayatu, Nafiu Garba;Ahmed, Imtiaz;Zhang, Huimin;Huang, Jing;Zhang, Huimin;Xiaoyu, Hao;Han, Tianfu;Nunez-Delgado, Avelino;Hayatu, Nafiu Garba

作者机构：

关键词： Acidic soils; Enzymatic activities; Microbial biomass; Modified biochar; P fractions

期刊名称：ENVIRONMENTAL SCIENCES EUROPE （ 影响因子：6.0； 五年影响因子：6.6 ）

ISSN： 2190-4707

年卷期： 2025 年 37 卷 1 期

页码：

收录情况： SCI

摘要： Modified (metal oxide) biochar is widely used for the remediation of degraded soils, but there has been limited research work on its effect on phosphorus fractionation and biochemical properties under different soil conditions. Therefore, this study examined the effects of a nonmodified wheat straw biochar (WBC) and a magnesium-modified wheat straw biochar (Mg-WBC) on phosphorus fractions, soil chemical properties, enzyme activity and microbial biomass in Qiyang (QY) and Harbin (HAR) soils. The study included a control, two WBC doses (1 and 2.5% w/w), and two Mg-WBC levels (1 and 2.5% w/w). The results revealed that WBC and Mg-WBC significantly improved soil characteristics. Alkaline phosphatase and catalase activities were significantly enhanced, while acidic phosphatase after an increase at 1% dose then decreased at 2.5% dose with both biochars. Both microbial biomass carbon and phosphorus showed significant increases when QY and HAR soil received 2.5% dose of biochar. Labile-P significantly increased by 28-77% and 15-47% in QY and HAR soil, respectively, for each of the two levels of WBC and Mg-WBC amendments. The concentrations of moderately-labile-P decreased (2-3% and 3-6%, in QY and HAR soil, respectively) at 1% rate, while increased (9-11%, and 3-6%, in QY and HAR soil, respectively) at the 2.5% rate of both types of biochar. However, the nonlabile-P decreased by 27-38% and 15-35% in QY and HAR soil, respectively. Mantel's test showed a stronger effect for soil organic carbon in the QY soil, while available phosphorus and microbial biomass carbon were more affected in the HAR soil. The partial least square path model (PLS-PM) analysis showed a better effect of biochar on acidic soil, and Mg-WBC significantly improved P availability in both soils. Our findings suggest that Mg-modified biochar would be an appropriate strategy for improving soil fertility, P-availability in labile and moderately labile forms, with specific recommendations for their use in different soil conditions.

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