Prediction Of Influence Of Groundwater Environment Change On Vegetation Ecology Under Coal Mining Disturbance ——Take The West One Mine Of WuJianFang Mining Area In Inner Mongolia As An Example

Xilingol league area west a mine is located in the Inner Mongolia autonomous region west ujimqin southwest five rooms coalfield,five rooms coalfield abundant coal resources,and most of the buried shallow,coal seam thickness,easy development,coal quality mostly in ash,low sulfur,low phosphorus flame coal and lignite,is of high quality steam coal and chemical industry with coal.However,a large area of national public welfare forest is distributed in the mine field,which is an ecologically sensitive area.The mining of coal will inevitably cause serious geological and hydrogeological problems,which will lead to regional subsidence and change of groundwater environment,destroy the original ecosystem of the region,and lead to the succession and degradation of the public welfare forest vegetation.Therefore,the study of the influence of groundwater environment change on vegetation ecology disturbed by coal mining in Xi Yi Mine can provide a favorable basis for the rational development of coal resources,the protection of groundwater resources and the restoration of ecological vegetation in this region.In this paper,a mine in the west is taken as an example.Based on the field investigation and remote sensing image data,the relationship between ecological vegetation and groundwater depth in the mine is analyzed.The recommended formula and probability integral method are used to predict and calculate the water-conducting fissure zone and subsidence area formed by coal mining,and the influence of coal mining on groundwater environment is analyzed.Finally based on the hydrogeological conceptual model,using the water balance method and numerical simulation method,and predicted the end of the different mining stages caused by groundwater environmental change,the change of the water area of,analysis of coal mining groundwater environmental change of water influence on vegetation ecology,and put forward feasible Suggestions of groundwater,ecological protection.The results show:(1)The vegetation types of Xiyi Mine can be divided into five types: elm sparse forest,Caragana microphylla,Tamarix magnoliana and Salix phellodendron,Stipa grandis + Leymus chinense community,Achnatherum splendens saline meadow and reed marsh.The dominant vegetation is sparse elm forest,and the suitable ecological water level range is 1-4m.The succession of vegetation community with groundwater depth is typical steppe ? shrub ? tree forest ?salinized meadow grassland ? salinized grassland vegetation.(2)The first and second stages of Xi-I Mine mainly mine coal resources in the middle and south dune distribution area.After the first stage of mining,there are two subsidence areas with wide range and large subsidence value,the maximum subsidence value is 9.08 m,and the water area is about 0.0042km2;After the end of the second stage of mining,the subsidence area is expanded to 5,the maximum subsidence value is 22.07 m,and the water area is about 0.6034km2.After the exploitation of the first and second stages,the nature of the waterlogged area is mainly seasonal water,and appropriate seasonal water is conducive to the growth of ecological vegetation in the central and southern regions.(3)The third stage of Xiyi Mine mainly mined coal resources distributed in the northwest.After mining,9 local subsidence areas were formed,with a maximum subsidence value of 36.74 m and an area of 9.7781km2.The northwest of Xiyi Mine is mainly the distribution area of quaternary pore stable phreatic aquifer,and the buried depth of phreatic level is relatively shallow.Mining subsidence makes the terrain lower and the phreatic level higher,resulting in the occurrence of water accumulation area,which is mainly of perennial water.On both sides of the main influence on the Guo Le valley type distribution of ? elm woodlands,Philippine + lobular caragana shrub + l.chinensis and s.grandis grasslands,achnatherum splendens saline meadow and reed swamp vegetation,lead to vegetation type ? sand sand yu yu into ? type,s.grandis + l.chinensis grassland vegetation gradually transformed into wet raw and aquatic vegetation(achnatherum splendens saline meadow and reed swamp),At the same time,the phenomenon of salinization will occur around the waterlogged area,and the vegetation will also change to the saline-alkali tolerant vegetation type.(4)Before mining xiyi mine field,countermeasures and measures such as setting up protective coal pillars,and setting up automatic monitoring of water level and water quality in the flooded area are put forward.