县域尺度土壤重金属含量的空间变异--以富阳市为例

Spatial distribution of heavy metals in arable topsoil at a regional scale of county——a case of Fuyang county,Zhejiang Province of China

运用地统计学和GIS相结合的方法，以浙江省富阳市为例，研究了县域尺度内农田耕作层（0—20cm）土壤中重金属含量的空间变异。结果表明，采用普通“西ng方法对富阳市农田表层土壤中Cu，Zn，Pb和Cd这4种重金属的含量进行局部空间插值后，前三种重金属呈现出一致的空间分布格局，而Cd的空间分布比较破碎。土壤中重金属含量超过国家土壤环境质量标准（GB15618-1995）二级的区域集中于厂矿周围。因此从空间分布情况来看，富阳市乡镇企业厂矿周围的农田土壤的重金属污染问题需要引起更多的关注，也为进一步对这些污染场地确定污染范围以及开展污染土壤的风险评估奠定了基础。

The spatial variability of heavy metal contents in arable topsoil（0 - 20 cm depth）at a county scale-a case of Fuyang county was studied with the methods of geo-statistics and geography information system. The results showed that after local space interpolation using common Kriging method, contents of these heavy metals（ Cu, Zn, Pb）presented consistent spatial distribution patterns, while content of Cd showed spatial distribution of rather crushing. The regions which contents of heavy metals in soil more than National Soil Environmental Quality Standard were major concentrated around factories and mines. So from their spatial distributions, it is needed to more attention that pollution problem of heavy metals in arable topsoil around factories and mines at Fuyang city scale.