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Ecotoxicology and environmental safety v.147, 2018년, pp.708 - 714   SCI SCIE
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Amendment damages the function of continuous flooding in decreasing Cd and Pb uptake by rice in acid paddy soil

Ye, Xinxin (Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, 130 Changjiang West Road, Hefei 230036, China ) ; Li, Hongying (Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China ) ; Zhang, Ligan (Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, 130 Changjiang West Road, Hefei 230036, China ) ; Chai, Rushan (Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, 130 Changjiang West Road, Hefei 230036, China ) ; Tu, Renfeng (Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, 130 Changjiang West Road, Hefei 230036, China ) ; Gao, Hongjian (Anhui Province Key Laboratory of Farmland Ecological Conservation and Po ) ;
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    Abstract 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+ /Fe 3+ 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. Highlights Amendment decreases the role of continuous flooding in Cd/Pb uptake by rice. Lowered variation of Cd/Pb bioavailability was due to the decrease of Fe availability. Alteration of Fe amount and compartment on root surface affect Cd/Pb uptake in rice.


  • 주제어

    Phosphate amendment .   Water management .   Rice .   Cd and Pb .   Combined remediation.  

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