贵州施秉牛大场太子参基地土壤重金属的空间特征

Spatial Distribution of Soil Heavy Metals of Shibing Pseudostellaria heterophylla Base in Guizhou

为了解施秉太子参基地土壤中Cr、Cu、As、Cd、Hg、Pb重金属含量的空间分布格局,划分污染控制分区,采用半方差函数拟合选出最优模型,再用空间分析模块进行插值分析。结果表明:6种重金属元素含量的半方差函数拟合较好,说明其空间结构性较好,各元素之间的相互影响不大。Hg、pH与各重金属元素不存在相关性,仅Cr与Cu、Cd与Pb呈显著正相关,Cu与Cd显著负相关,As与Pb、Cu与Pb极显著正相关,且相关系数较低。土壤重金属含量空间分布规律表明,Cr以示范园区2为中心,以圆形发散,含量由内向外递增;Cd以西北、东南向中心含量递减趋势;Hg含量以东北方向的林地向西南方向递增;Pb以示范园区2为中心,以圆形发散,含量由内向外递减,其他元素空间无明显规律。

The interpolation analysis of the optimum model fitted by semivariance functions was conducted by the spatial analysis module to study spatial distribution pattern of Cr,Cu,As,Cd,Hg and Pb heavy metals in soil of Shibing P .heterophylla base and to divide districts of pollution control.The results showed that the semivariance functions fitting of six heavy metals content is good,which indicates that the spatial structure is better and there is no obvious mutual effect between different heavy metals. There are no correlations between Hg, pH and other heavy metals. There are significant positive correlations between Cr and Cu and between Cd and Pb,a significant negative correlation between Cu and Cd,very significant positive correlations with lower correlation coefficient between As and Pb and between Cu and Pb The spatial distribution of soil heavy metals showed that Cr content gradually increases from inside to outside by a round divergence pattern based on the center of Demonstration Area 2,Cd content gradually reduces from Northwest and Southeast to the center, Hg content gradually increases from Northeast to Southwest,Pb content gradually reduces from inside to outside by a round divergence pattern based on the center of Demonstration Area 2 and there is no obvious law in other element space.