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Beijing Forestry University (2019)

Evaluation and Zoning of Ecological Vulnerability in Central Asia

赵艳;

Titre : Evaluation and Zoning of Ecological Vulnerability in Central Asia

Auteur : 赵艳;

Grade : Master’s Theses 2019

Université : Beijing Forestry University

Résumé
Central Asia is the core region of the silk road economic belt.With the development of "The Belt and Road" national strategy,the economic activities are gradually increasing,and the ecological environment is facing great challenges in central Asia.For a long time,central Asia is a typical temperate desert ecosystem with scarce precipitation,large evaporation and drastic temperature changes.Central Asia is a typical ecologically fragile region,which is extremely vulnerable to human activities and external interference.It has a special geographical location and abundant natural resources.By analyzing the background of climatic and dynamic changes of vegetation in central Asia,we analyzed the status of ecological environment,and ecological vulnerability based on the SRP model.The evaluation results are used for ecological zoning,and for different fragile communities propose countermeasures to adapt to their orderly development.(1)In the past 50 year(1966-2015),the average annual temperature of Central Asia fluctuates less and on the whole stable.The average annual precipitation is creasing,and its spatial distribution is closely related to the terrain.The average annual potential evapotranspiration fluctuates greatly,which is at a high level and shows an upward trend(2)In recent years(2000-2015),the vegetation in central Asia showed an insignificant downward trend and the ecological environment was relatively fragile.From the perspective of space,oasis on the edge of Xinjiang basin and the vicinity of Tianshan mountain range show an increasing trend,while the north and northwest regions of Kazakhstan show a decreasing trend.(3)With the change of time,the range of vulnerability levels in central Asia has changed,but the overall level is relatively stable.Ranking by the total area of the severe and extremely vulnerable areas,the ecological vulnerability level is in the order of:China Xinjiang>Kazakhstan>Turkmenistan>Uzbekistan>Tajikistan>Kyrgyzstan.In terms of space,the micro-fragile areas are mainly distributed in lakes,west Siberian plain and Tianshan mountain range.The slightly vulnerable areas are mainly distributed in the western and northern regions of Kunlun mountains and Kazakh hills.The moderate vulnerable areas are mainly distributed in northern Kazakhstan and near the Kunlun mountains.The severe vulnerable areas are distributed around the desert and are extremely susceptible to the desertification.The extremely vulnerable areas are distributed in arid areas such as deserts and Gobi.(4)Using the results of ecological vulnerability assessment,the central Asia region can be divided into three ecological regions,nine ecological sub-regions and 30 ecological communities.In each ecological conmunity,each vulnerable level cell includes 9 micro-fragile cells,4 mild vulnerable cells,6 moderate vulnerable cells,7 severe vulnerable cells,and 4 extreme vulnerable cells.According to the vulnerability level and the characteristics of each community,different restoration Suggestions were given to provide the basis for the later ecological restoration.

Mots clés : Central Asia; Climate change; Vegetation change; Ecological vulnerability assessment; Zoning;

Présentation (CNKI)

Page publiée le 21 mai 2020