Soil Nutrient Content And Heavy Metal Pollution Evaluation Of Farmland In The Sewage Irrigation Area Of ??Jingle County, Shanxi Province

In this paper,soil pollution condition in Jingle county sewage irrigation area are studied by taking 53 soil samples irrigation area,measuring the soil properties and the content of heavy metal and evaluating the soil environmental quality.The results are as followed:(1)The contents of soil heavy metal chromium,mercury,arsenic,lead,copper,zinc,nickel was analyzed.Results showed that the average contents of soil chromium,arsenic,mercury,lead,copper,zinc,nickel were 57.9,9.75,0.05,31.92,15.82,85.25,15.82mg/kg,respectively,in Jingle county sewage irrigation farmland.Compared with soil background values in Shanxi Province,the contents of chromium,arsenic,mercury,lead have no significant difference with the soil background values,copper is significantly lower,and the contents of zinc,nickel are higher than soil background values(2)The mean content of soil organic carbon is 10.69 g/kg.Compared with the control area,with an average organic carbon content of 8.21 g/kg,it is 30.21%higher in sewage irrigation area,suggesting wastewater irrigation is beneficial to increase soil fertility.However,soil pH is higher than control area,suggesting wastewater irrigation increases soil pH.It may bring some negative influence on agricultural activity.(3)The soil heavy metal content and pollution degree of soil in sewage irrigation area were evaluated by different evaluation methods.Results showed that the individual polluting indexes of each environmental indicators in 53 soils is ranged 0.1-0.75,and the integrated polluting indexes is ranged 0.4-0.57.According to Nemerow integrated polluting index,a contour map of integrated polluting index in the research area is got and the average integrated pollution index is 0.473.It is said that all the monitoring pollution index is within the scope of clean,the soil in Jingle county sewage irrigation area is not polluted.(4)By the environmental protection policy,It is needed to control the emissions of pollutants and promote the degradation of pollutants to reduce pollution in highest degree.