湖南新邵县土壤-水稻系统重金属富集特征

Accumulation Characteristics of Heavy Metals in Soil-Rice System in Xinshao,Hunan Province

对新邵县水稻种植区土壤-稻米系统Cd,Hg,As,Cr和Pb这5种强毒性元素富集特征进行了系统研究,结果发现,该区土壤具有明显的Cd富集。土壤中的Cd向水稻籽实中的转移量十分有限,单从土壤的污染指数判断水稻种植的适宜性缺乏说服力和科学性,应充分结合水稻对重金属元素的吸收与分配机理进行综合评价。

In this study,the accumulation characteristics of Cd,Hg,As,Cr and Pb were studied systematically in soil-rice system of Xinshao rice growing area.The results show that soil is obviously enriched with Cd.However,the transfer of Cd is very limited from soil to rice.Judging the suitability of rice planting only from soil pollution index is not convincing and scientific.The mechanism of absorption and distribution of heavy metal elements in rice should be comprehensively evaluated.