矿区污染土壤重金属含量与土壤主要养分相关性研究

Relationship betweenheavy metal content in polluted soil and main nutrients in mining areas

以小秦岭金矿区内选矿厂尾渣堆为研究对象,研究了尾渣堆周边土壤中重金属含量与有机质、全氮等主要养分指标的含量特征,并对其相关关系进行了分析。研究表明:研究区内土壤有机质、全氮含量总体上处于中等水平,其中有机质含量分布在10.8～18.2g·kg^(-1)之间,全氮含量分布于0.02～0.98g·kg^(-1)之间,土壤pH呈弱碱性,含量为7.48～8.17,重金属Cu、Zn、Cd等元素含量严重超标。土壤有机质含量与Ni、As显著正相关,土壤全氮与Cu呈显著负相关关系,与Ni显著正相关。通过对土壤有机质、全氮与重金属含量的关系研究表明,土壤有机质和全氮含量是影响土壤重金属含量的重要指标。

Taking the tailings heap of the ore dressing plant in the Xiaoqinling gold mining area as the research object,the contents of heavy metals in the soil around the tailings heap and the contents of main nutrients such as organic matter and total nitrogen were studied,and the correlations were analyzed.The results show that the soil organic matter and total nitrogen content in the study area are generally at a medium level,in which the organic matter content is between 10.8and 18.2g·kg-1,the total nitrogen content is between 0.02and 0.98g·kg-1.The soil pH is weak alkaline and its value is 7.48~8.17.The contents of heavy metals such as Cu,Zn and Cd seriously exceeded the standard.Soil organic matter content was significantly positively correlated with Ni and As.Soil total nitrogen was significantly?negatively correlated with Cu and positively correlated with Ni.The relationship between soil organic matter,total nitrogen and heavy metal content shows that soil organic matter and total nitrogen content are important indicators affecting soil heavy metal content.