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China University of Mining and Technology (2020)

Study on Ecological Cumulative Effects of Mining Areas in Arid and Semi-Arid Grassland in Eastern Inner Mongolia

房阿曼

Titre : Study on Ecological Cumulative Effects of Mining Areas in Arid and Semi-Arid Grassland in Eastern Inner Mongolia

Auteur : 房阿曼

Grade : Doctoral Dissertation 2020

Université : China University of Mining and Technology

Résumé partiel
Grassland in eastern Inner Mongolia is not only an ecological security barrier region of“Two Screens and Three Belts”,but also the distributional area of large coal and coal power bases.Ecological problems,such as grassland degradation,groundwater level decline,and biodiversity reduction caused by coal mining,had a serious negative impact on the ecology of mining area and its surrounding after long-term cumulation and spatial expansion.Taking grassland mining area in eastern Inner Mongolia as an example and using geographic information technology,the paper quantitatively analysed the ecological effects of vegetation evolution,land cover and site surface quality on large-scale mining areas in tempo-spatial scale with remote sensing images and experimental detection data.The main conclusions are as follows.(1)Summarize ecological cumulative effect mechanism of grassland mining area based on the relationship between mining area development and grassland ecosystem evolution,the ecological effect cumulative characteristic of grassland mining area,and cumulative response of key ecological factors.The development periods of coal mine includes initial development,accelerating development,stable development and decline development,and each period affects the spatial evolution of grassland ecosystems through different disturbance methods.The ecological cumulative effect of grassland mining area has the characteristics of time cumulation,spatial expansibility,cumulative source overlaying or synergying,recessive and dominant,indirect effects,threshold sensitivity and poor recoverability of ecological functions.(2)Maximum value composites and trend line analysis were applied to analyze the ecological effects of vegetation evolution in 25 large-scale mining areas in eastern Inner Mongolia from 1981 to 2015.The vegetation coverage towards increasing in eastern Inner Mongolia decreased in the order of Tongliao>Hinggan League>Chifeng>Hulunbuir>Xilingol over the past 35 years.For the changes in vegetation coverage of 25 large-scale mining areas before and after mining,vegetation showed a decreasing tendency in 40%mining areas,but an increasing tendency in 60%mining areas after mining.Except Shengli No.1,an obvious correlation was found between vegetation change and precipitation in 45.83%mining areas after mining.Human activities had significant positive effects on vegetation growth in 25%mining areas.

Mots clés : vegetation evolution; land ecological storage; temporal-spatial evaluation model; cumulative effects; grassland mining area

Présentation (CNKI)

Page publiée le 5 juin 2021