Abstract：The aim of this study is to determine the effects of irrigation pattern on leaching, migration, and transformation of Cd and Cr in a paddy soil-plant system. The concentrations of Cd and Cr in rice plant and paddy soil were measured in field plot experiments. The results showed that the leaching contents of Cd and Cr were reduced by 53.3% and 19.3% under controlled irrigation compared with flooding irrigation, thus the contents of Cd and Cr in paddy soil were decreased under the controlled irrigation; but there is no significant difference in Cd and Cr contents between controlled and flooding irrigation for the paddy soil after fertilization. The contents of Cd and Cr in 0-20 cm depth paddy soil were decreased by 1.2% and 0.6% in controlled irrigation compared with flooding one, suggesting irrigation pattern leads to different binding forms of Cd and Cr in the paddy soil. In most of time, the accumulated contents of Cd and Cr in the plant bodies above and under soil were higher in controlled irrigation than in flooding irrigation, implying the controlled irrigation can enhance Cd and Cr concentrations in plants. The Cd content in rice seeds was near the tolerance(0.2 mg/kg)in food products re-commended by National Food Safety Standard, China, but the Cr content was higher than the corresponding tolerance(1.0 mg/kg)in food products in controlled and flooding irrigation, thus there is a potential risk in Cr content over the tolerance. Clearly, these two kinds of irrigation are unhelpful in prevention from heavy metal pollution, and the rice seeds produced in those irrigation patterns can affect human health.
彭世彰, 乔振芳,, 徐俊增, 张剑刚, 金小平. 控制灌溉稻田土植系统Cd,Cr迁移转化[J]. 排灌机械工程学报, 2013, 31(7): 611-616.
Peng Shizhang, Qiao Zhenfang,, Xu Junzeng, Zhang Jiangang, Jin Xiaoping. Migration and transformation of Cd and Cr in paddy soil-plant system under controlled irrigation. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(7): 611-616.
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