Study on Spatial Migration Law of Heavy Metal Copper in Soil-Ligustrum lucidum Plant Interface System

Spatial distribution characteristics of heavy metals in soil-ischolar_main system have important significance for the research of soil pollution risk assessment and phytoremediation effect. Taking Ligustrum lucidum plant as an example in this paper, according to the characteristics of adsorption of heavy metals in soil by woody plants, laying out sampling points, using Sufer software for Kiging interpolation analysis, horizontal migration law of heavy metal copper in the soil-ischolar_main interface system was simulated. Through multi-model statistical regression trend analysis, the horizontal migration mechanism of copper in different section has been discussed. The results showed that under horizontal migration law in the surface soil, the migration capability of Cu by ischolar_main in soil near the ischolar_mains is relatively weak; with ischolar_main extending, the migration capability is strengthened gradually. In the deeper soil, the migration law with the ischolar_main extension was gradually weaker, and the main range of accumulation ability is 60-90cm in three sections. In addition, its migration law follows the cubic curve mode. Under longitudinal migration law, based on the Kriging method, migration models Z(hi) of heavy metal Cu in any depth of h_i are constructed.