Soil Heavy Metal Distribution Characteristics And Pollution Evaluation In The Dish-shaped Wetland Of Nanji Mountain

This paper mainly studies the two different soil layers of the four dish-shaped lakes(Baisha Lake,Changhu Lake,Nanshen Lake and Warfare Lake)and different elevations(gang,high beach,low beach and mud)in the South Rocky Mountains of Poyang Lake(0-10 cm and 10-20cm)The content characteristics of heavy metal elements in soil,the correlation between heavy metal elements,and the basic conditions of wetland soil environmental quality based on different pollution indexes,providing scientific data for regional actual production activities and scientific research.The results show that:(1)Cr,Zn and Cd have the highest content in Nanshen Lake,and Cu has the highest content in Changhu Lake.The four heavy metal elements in the Baisha Lake area have the largest coefficient of variation.(2)Different morphological analysis of heavy metals showed that the Cd content was in the high beach,and the soil state was dominated by the residual state and the iron-manganese oxidation state.Cr content is dominated by residual state and exchangeable state on different elevation gradients and between different lakes.Zn elements are mainly in residual state and organic state in different elevation gradients and different lakes.There is no special distribution law of the distribution of Cu elements in each elevation.(3)Correlation study shows that the total amount of Zn elements is significantly negatively correlated with the total amount of Cd elements,and there is a significant positive correlation between Cu elements and SOM,TN and TP,and SMC is significantly positively correlated.Zn and SOM and TN are significantly negatively correlated.There is no correlation between Cr and Cd and other nutrient elements.(4)Using the Nemero comprehensive index method,the ground accumulative index method and the potential ecological risk assessment method to evaluate the wetland soil in the study area,the results show that all three evaluation methods show that the Nanjishan dish-shaped lake wetland has a slight Ecological risk,the results of the three evaluation methods are basically the same.In summary,through the analysis of heavy metal content and morphology of different elevations and soil layers in four dish lakes,it is indicated that the pollution of the discshaped lake in Nanjishan is relatively light.It is suggested to reduce the accumulation of heavy metals in the soil by reducing pollution sources and carrying out ecological restoration measures for wetlands.Protect the ecological environment of the Nanji Mountain.