Objective The natural restoration of vegetation is seriously restricted by environmental conditions in the dreg field. Due to the unique soil parent material, it is necessary to explore the suitable vegetation restoration methods based on the general soil spray sowing technique.
Method In this study, we simulated the process of vegetation restoration after grouting the surface of the dreg field and performing soil spray sowing. By comparing the vegetation restoration and nutrient loss of three grouting depths (15, 30 and 45 cm), and combining the technical and economic benefits simultaneously, the best grouting depth was selected.
Result Compared with the control group (CK) without grouting treatment, the retention rate, average plant height and ground diameter of Amorpha fruticosa and soil nutrient condition significantly increased (P < 0.05) after grouting treatment. Meanwhile, the volume of leachate per unit area and the loss of nutrient remarkably decreased (P < 0.05). In terms of vegetation restoration, the grouting depth of 30 cm was much better.
Conclusion The grouting treatment can improve the soil water and fertilizer retention capacity, the retention rate of Amorpha fruticosa, and further promote its growth. The benefits are better when the grouting depth is 30 cm. This research provides technical reference for vegetation restoration in limestone dreg field.
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