Effect of exogenous phosphate on the lability and phytoavailability of arsenic in soils

文献类型： 外文期刊

第一作者： Wang, Jinjin

作者： Wang, Jinjin;Zeng, Xibai;Su, Shiming;Bai, Lingyu;Wang, Yanan;Zhang, Tuo;Wang, Jinjin;Li, Yongtao;Zhang, Hao;Zhao, Shizhen

作者机构：

关键词： Diffusive gradients in thin films;Phosphorus-arsenic interaction;Labile P/As molar ratio

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2018 年 196 卷

页码：

收录情况： SCI

摘要： The effect of exogenous phosphate (P, 200 mg.kg(-1) soil) on the lability and phytoavailability of arsenic (As) was studied using the diffusive gradients in thin films (DGT) technique. Lettuce were grown on the As-amended soils following the stabilization of soil labile As after 90 days incubation. Phosphate (P) application generally facilitated plant growth except one grown on P-sufficient soil. Soil labile As concentration increased in all the soils after P application due to a competition effect. Plant As concentration increased in red soils collected from Hunan Province, while decreases were observed in the other soils. Even though, an overall trend of decrease was obtained in As phytoavailability along with the increase of DGT-measured soil labile P/As molar ratio. The functional equation between P/As and As phytoavailability provided a critical value of 1.7, which could be used as a guidance for rational P fertilization, thus avoiding overfertilization. (C) 2018 Elsevier Ltd. All rights reserved.

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