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Effects of low-molecular-weight organic acids on the transformation and phosphate retention of iron (hydr)oxides

文献类型： 外文期刊

作者： Liang, Yu 1 ; Liu, Jing 1 ; Jin, Jiezi 1 ; Han, Yuling 1 ; Wei, Zhiyuan 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Haikou 571101, Peoples R China

2.Huazhong Agr Univ, Coll Resources & Environm, State Environm Protect Key Lab Soil Hlth & Green R, Wuhan 430070, Peoples R China

关键词： Phosphate availability; Root-exudated LMWOAs; Rhizobox simulation; Iron (hydr)oxide

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 940 卷

页码：

收录情况： SCI

摘要： The retention and mobilization of phosphate in soils are closely associated with the adsorption of iron (hydr) oxides and root exudation of low-molecular-weight organic acids (LMWOAs). This study investigated the role of LMWOAs in phosphate mobilization under incubation and field conditions. LMWOAs-mediated iron (hydr)oxide transformation and phosphate adsorption experiments revealed that the presence of LMWOAs decreased the phosphate adsorption capacity of iron (hydr)oxides by up to -74 % due to the competition effect, while LMWOAs-induced iron mineral transformation resulted in an approximately six-fold increase in phosphate retention by decreasing the crystallinity and increasing the surface reactivity. Root simulation in rhizobox experiments demonstrated that LMWOAs can alter the contents of different extractable phosphate species and iron components, leading to 10 % - 30 % decreases in available phosphate in the near root region of two tested soils. Field experiments showed that crop covering between mango tree rows promoted the exudation of LMWOAs from mango roots. In addition, crop covering increased the contents of total phosphate and available phosphate by 9.08 % - 61.20 % and 34.33 % - 147.33 % in the rhizosphere soils of mango trees, respectively. These findings bridge the microscale and field scale to understand the delicate LMWOAs-mediated balance between the retention and mobilization of phosphate on iron (hydr)oxide surface, thereby providing important implications for mitigating the low utilization efficiency of phosphate in iron-rich soils.

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