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Amendment damages the function of continuous flooding in decreasing Cd and Pb uptake by rice in acid paddy soil

文献类型： 外文期刊

作者： Ye, Xinxin 1 ; Li, Hongying 2 ; Zhang, Ligan 1 ; Chai, Rushan 1 ; Tu, Renfeng 1 ; Gao, Hongjian 1 ;

作者机构： 1.Anhui Agr Univ, Sch Resources & Environm, Anhui Prov Key Lab Farmland Ecol Conservat & Poll, 130 Changjiang West Rd, Hefei 230036, Anhui, Peoples R China

2.Anhui Acad Agr Sci, Inst Soil & Fertilizer, Hefei 230031, Anhui, Peoples R China

关键词： Phosphate amendment;Water management;Rice;Cd and Pb;Combined remediation

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2018 年 147 卷

页码：

收录情况： SCI

摘要： Combinations of remediation technologies are needed to solve the problem of soil contamination in paddy rice, due to multiple potential toxic elements (PTEs). Two potential mitigation methods, water management and in situ remediation by soil amendment, have been widely used in treatment of PTE-polluted paddy soil. However, the interactive relationship between soil amendment and water management, and its influence on the accumulation of PTEs in rice are poorly understood. Greenhouse pot experiments were conducted to examine the effects of phosphate amendment on Cd and Pb availability in soil and their influence on Cd and Pb uptake into rice, on Fe and P availability in soil, and on the alteration of Fe amount and compartment on root surface among different water management strategies. Results indicated that Cd and Pb content in the shoot and grain were significantly affected by the different water management strategies in nonamended soils, and followed the order: wetting irrigation > conventional irrigation > continuous flooding. The application of phosphate amendment significantly decreased the variations of Cd and Pb absorption in shoot and grain of rice among different water treatments. The reasons may be attributed to the enhancement of P availability and the decrease of Fe availability in soil, and the decreased variations of Fe-2/Fe3+ content in root coating after the application of phosphate amendment. These results suggested that the simultaneous use of phosphate amendment and continuous flooding to immobilize Cd and Pb, especially in acid paddy soils, should be avoided.

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