关键词: 氨挥发, 缓/控尿素, 水田, 氧化亚氮排放, 持续施肥

Abstract: There is a complex interaction between reclaimed vegetation and soil environment in mining area. In particular, soil fertility and soil moisture are closely related to vegetation restoration. How to realize the coordinated development among reclaimed vegetation, soil moisture and fertility to promote the improvement of ecological system is the core issue of ecological restoration in mining areas. Therefore, the Antaibao Opencast Coal-mine dumps in Shanxi Pingshuo mining area were selected to analyze the relationship between the characteristics of soil water or fertility and the vegetation restoration by the plot investigation method, and the coupled coordination degree model was used to quantify the influence of soil quality on vegetation growth and assess the coordination degree of soil water or soil fertility and reclaimed vegetation. The results showed that the soil water content increased with increasing soil depth in the 0-40 cm soil layer, and the change trend of soil organic matter and total nitrogen was opposite to that of soil water content. The effect of soil fertility characteristics on the growth of reclaimed vegetation was greater than that of soil water; the coupling relationship between soil water or fertility and reclaimed vegetation was basically coordinated. In the loess area, the soil nutrient condition is poor, the ecological environment is harsh, and thus the key of ecological reconstruction is to improve the soil fertility condition, select the appropriate vegetation reclamation model and control the density of vegetation. This study can provide a reference for land reclamation and ecological restoration in the dumps of opencast coal-mine in the loess area.

Key words: slow/controlled release urea, emission of N₂O., paddy field, continuous application, ammonia volatilization