湖州土壤重金属污染趋势预测及环境容量评价

Prediction of the Trend for Soil Pollution of Heavy Metals in Soils at Huzhou and Evaluation of the Environmental Capacity

测定了湖州市表层土壤的重金属含量,对各元素的累积趋势进行了预测,利用克里格插值法揭示了该地区土重金属环境容量的空间分布特征。结果表明各元素的累积增长率大小顺序为:Cd>Pb>Zn>Cu>Ni>Cr>Hg>As。不同元素的环境容量差别巨大,且消耗容量的速度也有很大差异,消耗最快的元素是Pb,最慢的元素是Hg。90%以上面积的土壤处于高、中容量区,5.6%土壤处于低容量区,0.9%土壤处于警戒区,2.5%土壤处于超载区。

The contents of heavy metals were determined to predict the trend of pollution by heavy metals in surface soils of Huzhou.The Kriging method was applied to disclosing the spatial distribution of environmental capacities for heavy metals in surface soils.The results showed that the accumulation increasing ratios of different heavy metals followed the order of Cd>Pb>Zn>Cu>Ni>Cr>Hg>As.Environmental capacity and its consuming velocity of different elements were of diversity.The environmental capacity of Pb was consumed fastest and Hg was consumed slowest.The areas of high and moderate capacities account for above 90%,and those of low capacity,alert capacity and overload capacity were 5.6%,0.9% and 2.5%,respectively.