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Identifying biotic and abiotic processes of reversing biochar-induced soil phosphorus leaching through biochar modification with MgAl layered (hydr)oxides

文献类型： 外文期刊

作者： Peng, Yutao 1 ; Zhang, Baige 3 ; Guan, Chung-Yu 4 ; Jiang, Xiaoqian 1 ; Tan, Jinfang 1 ; Li, Xiaoyun 1 ;

作者机构： 1.Sun Yat sen Univ, Sch Agr, Shenzhen 518107, Guangdong, Peoples R China

2.Sun Yat sen Univ, Henan Inst, Modern Agr Innovat Ctr, Guangzhou, Peoples R China

3.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou 510640, Peoples R China

4.Natl Ilan Univ, Dept Environm Engn, Yilan 260, Taiwan

关键词： Biochar; Layered double hydroxides; Adsorption; Phosphorus leaching; Dissolved organic matter

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 843 卷

页码：

收录情况： SCI

摘要： Biochar (BC) as a increasing widely adopted soil amendments showed potential threat to soil P leaching, but the relevant mechanisms were not clear enough and relevant strategy should be proposed to address the P leaching induced by BC application. In this study, effects of ordinary corn straw BC, and a fabricated Mg/Al-LDHs modified biochar (LBC) on soil P availability, adsorption, fraction and mobility were compared and investigated by conducting the column and incubation experiments at biochar to soil rate of 1 %, 2 % and 4 % (w/w). Chemical sequential extraction methods and various solid-state method (i.e., three-dimensional excitation emission matrix (EEM), x-ray diffraction (XRD), scanning electron micrograph (SEM) and P K-edge X-ray absorption near edge structure (XANES)) were utilized to give deep insights into the P mobilization and immobilization mechanisms by respectively applying the BC and LBC. Results of incubation experiments showed that applying the LBC reduced the labile P with significant Ca\\P transformation to Al-retained P, while ordinary BC promoted the Fe/Al-P transformation to labile dibasic calcium phosphate and monobasic calcium phosphate evidenced by the EEM analysis, in-situ XANES investigation and chemical sequential extraction methods. Results of phosphatase and microbial analyses indicated that the decreased labile P after 30 days' incubation and the mitigated P leaching in LBC treatment were dominantly ascribed to abiotic processes of inorganic P transformation and (de) sorption. This research gave deep insights into abiotic and biotic processes of ordinary biochar promoting soil P leaching, and important implications for applying engineered biochar in reducing P leaching and improving soil productivity.

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