Study on the relationship between typical vegetation distribution, landform and groundwater in mining subsidence area

There is a certain relationship between vegetation growth and soil water and groundwater. In order to study the influence and change relationship between the vegetation distribution, landform and groundwater in Daliuta Mining Subsidence Area, based on the field survey and hydrological borehole observation, the distribution characteristics of vegetation in different landforms are analyzed, and the relationship between the vegetation growth and distribution in the subsidence area and groundwater is analyzed. The results show that the vegetation is distributed non zonally with the change of landform, from the top to the bottom of the mountain and the valley, the vegetation is divided into meadow vegetation, shrub grass vegetation, arbor grass vegetation and aquatic vegetation, and the diversity of vegetation on the hillside is the most abundant. Under the conditions of overburden movement and crack development, groundwater is damaged, but there is no significant impact on the growth and development of most ecological vegetation in a short period of time. The damage of crack development to ecological vegetation is mainly shown in the edge of the crack, which blocks the root system of vegetation. Salix psammophila, Artemisia argyi, Caragana korshinskii, Populus microphylla, Salix mandshurica, Phragmites communis, Convolvulus tomentosa, Acorus calamus, Juncus effusus have significant correlation with groundwater buried within 5 m: when the groundwater depth is between 10 and 15 m, Salix psammophila, Caragana korshinskii, Populus microphylla and Salix matsudana are significantly related to it; when the groundwater depth is between 15 and 30 m, only Populus microphylla and Salix matsudana show significant correlation with groundwater. When the groundwater depth is below 30 meters, the abundance of arbors, shrubs, and herbaceous vegetation is weakly or extremely weakly correlated with groundwater. There is a linkage relationship between vegetation, topography, and groundwater in subsidence areas, which has important reference value for in-depth research on ecological self restoration in coal mining subsidence areas.