Changes in cadmium and zinc concentrations of paddy soils and rice plant tissues (leaves, stem and grain) with distances from the road
Roadside polluted by Zn and probably with a restriction Cd uptake by plant is not only derived from tire wear but also from corrosion of galvanized road furniture. The aim of this study was to investigate the changes of Cd and Zn concentrations in the paddy soils and rice (Oryza sativa L. ) produced in different distances from the road. Surface soils (0-25cm) and rice plants were collected from rice fields in Petchburi and Nakhonpathom, Thailand in September 2006. The soil and rice plant samples were col lected in 5, 10, 15, 20, 25, and 30m and 10, 20, 30, 40, and 50m distances from the road in Petchburi and Nakhonpathom provinces, respectively. Zinc and Cd concentrations in the soils and rice (grain, leaves and stem) were determined. The HNO<,3> and DTPA-extractable Zn concentrations in the paddy soils were decreased while the amount of extracted-Cd slightly increased or unchanged by distances from the road. Zinc and Cd concentrations in rice tissues significantly varied with distances from the road. In Phetchburi, Zn concentration in rice tissues unchanged while Cd increased. In Nakhonpathom, Zn concentration reduced while Cd increased in rice tissues with distances from the road. The result of this study indicated that the roadside pollution by Zn might cause enhanced Zn level of the soil and as a result, greater Zn and less Cd accumulation in the rice grains.
Cadmium Paddy soil Rice Roadside Zinc
S. Supaphol N. Churthong R. Kasetsuwan A. H. Khoshgoftar
Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand Department of Soil Science, Isfahan University of Technology, Isfahan, Iran
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
124-125
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）