吉林省农田黑土中Cd、Pb、As含量的空间分布特征

Spatial Distribution of Cd,Pb,As Contents in the Farmland Black Soil in Jilin Province

利用地统计学方法研究了吉林省黑土区耕层土壤（0～20cm）中Cd、Pb、As含量的空间结构及其分布特征．结果表明，研究区土壤Pb含量属中等程度的空间相关，而Cd、As含量属空间弱相关．3种元素含量的空间变异主要受人为的随机性因素的影响．利用半方差函数的分析结果经普通克立格插值得到了3种元素含量的空间分布图．结果显示，在空间分布上，受不同污染源的影响，土壤Cd、Pb、As含量表现出不同的分布特征．土壤Cd含量较高的地区主要分布于煤矿区周围；土壤Pb含量高的样点主要分布于城郊及公路两侧；煤矿区周围及城郊农田土壤中As含量相对较高．

Spatial distribution and pattern of Cadmium （Cd）, Lead （Pb） and Arsenic （As） contents in the farmland black soil in Jilin Province were analyzed using geostatistics methods. Result of semivariance fitness models showed that Pb content in soil was autocorrelated to a moderate degree while contents of Cd and As were auto-correlated to a low degree, respectively. Based on the results of semivariance analyses, distribution maps were generated using Kriging interpolation. The result showed that heavily Cd-contaminated site occurred mainly around the mine area, and the accumulation area for Pb appeared mostly in the suburb and roadsides, while in farmland of suburb and vicinity of coal mine the As content was higher.