| Coal mining causes a large number of villages abandoned,a large area of farmland damaged,seriously affect people's production and life.Therefore,it is an effective way to solve the contradiction between man and land and social contradictions in the mining area.The quality of reclaimed soil is the key to the success of reclamation.The evaluation of reclaimed soil quality and sustainability of soil system is of vital importance to the sustainable development of agriculture in mining area.In view of this,the thesis takes village wasteland reclamation area in zhaoguerkuang mine as the research object,based on the growth characteristics of temporal and spatial change of crop growth in different periods of physical and chemical properties,reclaimed soil microbiological characteristics analysis of crop on the recovery index and sustainable index system model to evaluate the reclaimed soil quality and sustainable use of the system soil.The main research results are as follows:(1)Under the influence of mining subsidence,village wasteland reclamation area due to surface water level rise,reclaimed soil water content were significantly higher than those in the control area;reclaimed soil organic carbon and total nitrogen content were significantly lower than the control area,but the stability of organic carbon and total nitrogen in reclaimed soil subsidence area is significantly higher than that of unstable subsidence area.(2)The soil water content is too high,so that the soil respiration is blocked,and the reclaimed soil respiration in the subsidence area is significantly lower than that in the control area.Soil urease and invertase activities were significantly lower than those in control area under the influence of soil physical and chemical properties.The influence of surface subsidence on the ecological characteristics of reclaimed soil is worse than that of stable subsidence area.(3)The changes of physical and chemical properties and microbial characteristics of reclaimed soil will affect the soil nutrient uptake and physiological characteristics,and ultimately affect crop production.The nitrogen content,chlorophyll content and photosynthetic rate of wheat plants were significantly lower than that of control area in reclamation area.However,the nitrogen content,chlorophyll content,photosynthetic rate and yield of wheat were significantly higher than those in unstable subsidence area.(4)Through a comprehensive evaluation of the sustainability of the reclaimed soil quality and system stability,subsidence,soil restoration index and sustainability index is higher than that of unstable subsidence area,stable subsidence of soil comprehensive quality is better than that of reclamation area is unstable subsidence area,more sustainable. |
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