摘要
对广西西江流域农业土壤中Cd的空间分布规律进行了调查研究并分析了水稻中Cd超标情况.结果表明,农业土壤Cd含量变异较大,为0.01～33.6mg/kg,且含量自上游到下游呈明显递减趋势.插值图显示,高Cd含量斑块主要分布在上游矿业活动密集的0～80km区域内,土壤Cd含量显著高于其他区域(P<0.05),整个调查流域内有32%的土壤样品属于重度污染.流域内水稻籽粒Cd含量为0～6.37mg/kg,成人水稻籽粒Cd摄入量为0～4159μg/(人?d).距上游矿区0～80km范围内的风险指数均值达6.49,属于高Cd风险区域.
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 comamination 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.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2009年第6期661-667,共7页
China Environmental Science
基金
“十一五”国家科技支撑计划项目(2006BAK02A16-4)
关键词
流域
农业土壤
CD
环境风险
river draining： agricultural land： Cd
environmental risk
