夏尔希里地区土壤重金属含量特征及空间变异分析

Characteristics and Spatial Variability of the Soil Heavy Metals Contents in Xiaerxili Area

以夏尔希里地区为研究区,对土壤样品中Co,Cr,Cu,Mn,Ni共5种重金属的含量特征和空间分异规律进行了研究,采用单因子和内罗梅法分析土壤重金属的污染程度,并利用地统计学方法分析研究区土壤重金属的空间分异特征等。结果表明:研究区5种土壤重金属含量为:Mn>Cr>Cu>Ni>Co,5种重金属和有机质均属于中等变异强度;相关性分析结果显示:Co与Cu,Mn呈现显著相关;Cr与Cu,Ni有显著正相关;有机质与Cr,Mn,Cu,Ni均呈现正相关;重金属含量空间分异特征整体表现为绿洲区>荒漠区>山地森林区;重金属污染评价结果为:Co和Mn属于轻污染,Cr和Ni处于警戒线,属于尚清洁状态。

Taking Xiaerxili area as the study area,we analyzed content characteristics and spatial distributions of five heavy metals（Co,Cr,Cu,Mn and Ni）of the soil samples.The single pollution index and the composite pollution index were used to assess the soil heavy metal pollution,and geostatistics method was applied to evaluate the spatial distributions characteristics of soil heavy metals in the study area.Results showed that contents of 5kinds of heavy metals decreased in the order：MnCrCuNiCo in the research area,the heavy metals and organic matter belonged to the medium variability;the results of correlation analysis showed that the significant correlations were found between Co and Cu,Mn;the significant positive correlations were observed between Cr and Cu,Ni;organic matter and Cr,Mn,Cu,Ni had the positive correlation;spatial distribution characteristics of heavy metal contents as a whole showed the sequence：oasis areadesert areamountain area;heavy metal pollution assessment results inicated that Co and Mn pollution was slight,Cr and Ni pollution was still clean but at the warning level.