Abstract: Aiming at the special conditions of soilless steep slope in mining junkyard, the artificial soils composed of sewage sludge and fly ash were used as the medium, and Robina pseudoacacia and Amorpha fruticosa were planted in pits. At the same time, grasses were grown in the pits to fertilize the artificial soils. It was found that the R. pseudoacacia planted on artificial soil Ⅱ (fly ash∶sewage sludge=1∶1) had a high survival rate (70%) and a higher growth potential, suggesting that this remediation technology offered a potential of industrial byproduct utilization, and solved the shortage of soil resources in mining area.

Key words: Fine root, Foraging behavior, Soil nutrients, Spatial heterogeneity