Effect of soil water regimes on accumulation of heavy metals in brown rice
Two heavy-metal-contaminated paddy soils derived from red soil and alluvial soil were used for pot experiments to investigate the effect of soil water regimes on the formation of iron plaque on the root surfaces of rice (Oryza sativa L. cv. Weiyou 46) and on the uptake and accumulation of cadmium, arsenic, lead and copper in the grain of rice. There were 3 irrigation treatments with 5 replicates each, i.e. flooding, intermittent irrigation and saturating. The results showed that more iron plaque could be formed on root surfaces of rice under flooding condition than under saturation or intermittent irrigation condition. Cadmium, lead and copper were highest in brown rice when rice was exposed to saturating treatment, followed by intermittent irrigation and flooding irrespective of soil type used. However, higher As was found in the grain of rice subjected to intermittent irrigation treatment. The results seem to suggest that iron plaque acted as a barrier for Cu, Cd and Pb in the rhizosphere soil and diminished the uptake and translocation of these heavy metals into rice grain.
iron plaque heavy metals paddy soils rice
Yongchao Liang Xionghui Ji Zhaojun Li Shengxian Zheng Yanhong Lu Jun Nie Yulin Liao
Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Soils a Institute of Soils and Fertilizers, Hunan Academy of Agricultural Sciences, Changsha 410125 China Co
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
988-989
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）