Abstract：Xijiang River draining is one of the main food grain and mine producing region in Guangxi province. In order to identify soil cadmium (Cd) spatial distribution patterns and food safety risk, soil and crop in this region were analyzed. Soil Cd concentration was in range of 0.01~33.6mg/kg and distribution of Cd decreased with distance from the upstream. The soil Cd concentration along the river channel which located 0 to 80km away from the mining area had significant differences (P<0.05) compared with that in 80~610km away from the mining area along the river channel. Based on the Cd spatial distribution in agricultural soils, hot spot areas with high Cd concentrations were in the dense mining area which located in the upper course of the draining. The results of Nemero single contamination index assessment suggested that 32.2% of the soil samples belong to the grade of high pollution. The results also showed that the rice Cd concentration was in the range of 0.01~6.37mg/kg and the daily dietary intake of Cd from rice varied from 0.47~4159μg/(人×d). Average risk index of soil Cd reached 6.49 in the dense mining area located in the upstream and this was high environmental risk area in the investigated river draining.
翟丽梅, 廖晓勇, 阎秀兰, 陈同斌, 刘宏斌, 谢华. 广西西江流域农业土壤镉的空间分布与环境风险[J]. 中国环境科学, 2009, 29(6): 661-667.
DI Li-Mei, LIAO Xiao-Yong, YAN Xiu-Lan, CHEN Tong-Bin, LIU Hong-Bin, XIE Hua. Spatial variation and environment risk of cadmium in agricultural land in the Xijiang River draining of Guangxi Province. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(6): 661-667.
