Effect of exogenous phosphate on the lability and phytoavailability of arsenic in soils.
作者信息
Wang Jinjin, Zeng Xibai, Zhang Hao, Li Yongtao, Zhao Shizhen, Su Shiming, Bai Lingyu, Wang Yanan, Zhang Tuo
机构信息
Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agriculture Sciences/Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing, 100081, China; The College of Natural Resources and Environment of South China Agricultural University/Key Laboratory of Arable Land Conservation (South China), Ministry of Agriculture, Guangzhou, 510642, China.
Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agriculture Sciences/Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing, 100081, China.
出版信息
Chemosphere. 2018 Apr;196:540-547. doi: 10.1016/j.chemosphere.2017.12.191. Epub 2017 Dec 30.
The effect of exogenous phosphate (P, 200 mg⋅kg 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.
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