集贤县农田土壤重金属空间分布特征

Heavy metals spatial distribution character of Jixian county farmland soil

本文对三江平原玉米主产县集贤县农田土壤进行重金属(Hg、Pb、Cr、Cu)采样和监测,并基于GIS技术对重金属的空间分布特征进行了分析。结果表明,与三江平原土壤重金属背景值相比,Hg的含量有所累积与升高,Pb、Cr、Cu则低于背景值;该县农业土壤重金属检测结果符合《无公害食品大田作物产地环境条件(NY5332-2006)》的标准要求,适合开展农作物无公害生产;统计分析得出Hg呈中等强度空间自相关,其余3种(Cu、Cr、Pb)为弱空间自相关,该区农业土壤重金属的含量分布主要受母质、地形地貌、土壤性质等内在因素影响。

Jixian county is the biggest corn production country in sanjiang plain.Based on GIS （geographic information system technology）,the concentration of heavy metals was monitored and analyzed（Hg,Pb,Cr and Cu）.The results showed that the concentration of Hg was accumulated,it showed increasing trend contrasting with Sanjiang plain soil microelement background values.But the concentrations of Pb,Cr and Cu were lower than Sanjiang plain soil microelement background values.The monitored results were in accordance with the agricultural industry standards of People＇s Republic of China ＂pollution-free food;environmental conditions of crops in farmland （NY5332-2006）＂ standards.It is suitable for the production of non-harmful corn.Through the statistic analysis,it can be concluded that Hg was moderate intensity of spatial autocorrelation.Cu、Cr and Pb were weak intensity of spatial autocorrelation.The heavy metal concentrations and space distribution were mainly affected by cane,topography,soil properties and other internal factors.