The Difference Of Heavy Metal Ions In The Soil Of Chrysanthemum Morifolium In Different Regions And Pollution Assessment

With the rapid development of industrialization and urbanization in China,more and more soil is influenced by human activities,and the heavy metal pollution in soil is becoming more and more serious.In Jiaxing,Chrysanthemum morifolium as a pillar industry,but also China's largest areas,in recent years,due to the conflict of economic and environmental,soil environmental areas also suffered varying degrees of pollution.In order to reflect the content of soil heavy metals in Chrysanthemum morifolium production area in Jiaxing City,selected 3 areas with the local representative,collected a total of more than 60 copies of the production area in soil samples.The Oxford handhold metal detectors were detected,and selected the seven elements of Cr,Ni,Cu,Zn,Cd,Hg and Pb as the evaluation elements,For the whole region the content and background values were compared between,content characteristics of statistics of each collection point,before and after the application of the variation of heavy metal content analysis,Through the Nemero index method,potential ecological risk index method to evaluate the pollution situation of the collection points in the study area,and determine whether it has heavy metal harm.And try to explore the source of pollution and put forward the relevant control measures.Research results show that:(1)in three major areas of Cr,Cd,Hg,Pb overall element content is generally higher than the Hangjiahu Plain Background Values,The contents of Ni,Cu and Zn elements were lower than the background values.The Hg content than the background value has a larger gap,as the main pollutants,have very strong ecological risk.(2)The high content of Hg mainly concentrates in the production area,showing some point pollution,and the coefficient of variation is strong variation,which is affected by human activities.It may be due to the differences in the individual planting methods(using the fungicide containing methyl mercury)and the comprehensive pollution caused by the special geographical environment.The high content of Cd is more common,and the coefficient of variation is moderate variation,which may be caused by the historical background of the production area.(3)Evaluation results showed that Hg and Cd were the major pollutants,and they all had obvious pollution.In the Cd,the points are light pollution,and in the Hg,the collection points show a different degree of heavy pollution and moderate pollution.From a single heavy metal potential ecological hazard index,Cd in the middle of the ecological hazards,Hg is in a very strong ecological hazard,and the rest of heavy metals in a slight ecological harm.From a variety of potential ecological risk index of heavy metals,the 3 production areas are in a strong ecological hazard(4)According to the results,it is suggested that the surrounding environment of the high pollution point must be detected to determine the main source of pollution.Explore the environment,fertilizer and pesticide may affect the quality of Chrysanthemum morifolium.In order to improve the soil environment,cultivation mode is proposed by Chrysanthemum morifolium and different crop rotation,intercropping and as.In the case of heavy metal pollution in soil,the content of heavy metals in soil can be regulated by plant restoration,such as plant extraction,plant stability,plant volatilization and so on.