Spatial Distribution Characteristics and Pollution Evaluation of Soil Heavy Metals in Wulongdong National Forest Park

Abstract

Objective To find out the spatial distribution characteristics and pollution status of soil heavy metal content in Wulongdong National Forest Park. Method On the shady and sunny slopes, 3 altitude gradients of 900, 1000, 1069 m were selected respectively, and 6 sampling points were set up to collect soil samples in layers,The contents of 7 heavy metal elements in soil including Cr, Cd, Hg, Ni, Se, As, Pb were determined. Referring to the national background values of soil elements, the single factor index method, Nemerow index method and pollution load index method were used to comprehensively evaluate the pollution status of heavy metals in soil. Conclusion In the 0-20 cm soil layer of Wulongdong National Forest Park, three heavy metal elements, Ni, Cd and Hg, have reached the pollution level, among which Ni is slightly polluted, and Cd and Hg are moderately or above polluted. The soil on the sunny slope was slightly polluted by heavy metals, and the soil on the shady slope was not polluted by heavy metals.