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China University of Mining and Technology (2020)

Study on Guided Restoration of Damaged Vegetation in Semi-arid Coal Mine Area

刘英;

Titre : Study on Guided Restoration of Damaged Vegetation in Semi-arid Coal Mine Area

Auteur : 刘英;

Grade : Doctoral Dissertation 2020

Université : China University of Mining and Technology

Résumé partiel
The eco-environment of semi-arid mining areas in Western-China is fragile,and the climate conditions are bad.Large-scale coal mining makes the original fragile eco-environment worse and the social ecological environment problems worsen.It is very urgent to realize the sustainable management of mine land and restore its production capacity.It is necessary for the sustainable development of the ecological environment in the mining area to find out the influence of the surface environmental factors change on the vegetation under the condition of coal mining and to explore the effective method of the guided restoration of the plants in the semi-arid mining area.However,there are several basic problems in the guided restoration of damaged vegetation in semi-arid mining areas,such as,to what extent can vegetation self recover ?When manual guidance intervention is needed,where to intervention ?How to intervene ?To what extent ?Therefore,chlorophyll fluorescence induction technology,airborne hyperspectral monitoring technology and satellite remote sensing monitoring technology were used to extract the disturbed vegetation in semi-arid mining area from multiple angles and scales in this paper.On the basis of the research on the mechanism of plant damage caused by coal mining collapse and the law of time and space disturbance,the above four basic problems are studied to explore the vegetation guided recovery model in semi-arid mining area,so as to provide the methodological basis for the construction of green mine and the reconstruction and utilization of vegetation in mining area.The research results are as follows :(1)The collapse of coal mining results in the destruction of soil site conditions,the deformation of rapid chlorophyll fluorescence induction curve of plant leaves,the reduction of energy share used for electron transfer in plant leaves,resulting in the gradual inhibition of electron transfer and the reduction of photosynthesis efficiency of plant leaves.The stomatal conductance,photosynthetic rate and transpiration rate decreased with the increase of stomatal limitation.The damage degree of plants in the tensile and compression areas is greater than that in the neutral areas,so the priority should be given to the restoration of damaged plants in the compression and tension areas.The reason for the damage of individual plants in the subsidence area is that the coal mining subsidence forms a large number of cracks on the surface of the earth,destroys the soil structure,increases the evaporation surface of soil water,and accelerates the loss of soil water.At the same time,groundwater is evacuated and the buried depth of phreatic water level is reduced,which affects the supply of groundwater to surface water.Soil water content is the most important factor to affect the photosynthetic physiological activities of plants in semi-arid coal mining subsidence area.

Mots clés : semi-arid area; ecological restoration; Airborne Hyperspectral; chlorophyll fluorescence; guided restoration;

Présentation (CNKI)

Page publiée le 3 juin 2021