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Inner Mongolia Normal University (2020)

Study on Dynamic Change of Land Desertification in Desert-oasis Ecotone of Southeastern Margin of Tengger Desert

刘晓茜;

Titre : Study on Dynamic Change of Land Desertification in Desert-oasis Ecotone of Southeastern Margin of Tengger Desert

Auteur : 刘晓茜;

Grade : Master’s Theses 2020

Université : Inner Mongolia Normal University

Résumé partiel
Desert-oasis ecotone is the connection zone of material and energy exchange between desert and oasis.Its stability has a significant impact on the balance of supply and demand of ecosystem services in oasis.The ecotone located in the edge of desert is prone to land desertification,which will lead to the loss of local biological and economic productivity,and in most cases,it will cause the reduction of vegetation types and quantity and the continuous increase of surface bare soil.It is the key to evaluate the temporal and spatial changes of desertification and determine the driving factors of desertification.Using remote sensing dynamic monitoring can understand the distribution and causes of desertification,improve the efficiency of monitoring,early warning and mitigation,so as to determine the impact of the degree of land desertification more quickly,in order to cope with and adapt to the future risks related to land desertification.Taking the desert oasis ecotone in the southeast edge of the Tengger Desert as the research area,using the remote sensing images of 1986,1991,1996,2001,2006,2011 and 2018 to establish the Desertification Difference Index(DDI)model and sketch the desert boundaries in the remote sensing images of 1986,1996,2006 and 2018,monitor and analyze the dynamic changes of land desertification in more than 30 years.Using correlation analysis method to determine the main influencing factors of land desertification,and then to explore the role of these factors in land desertification.The desertification difference index model has achieved a better result for the classification of land desertification degree in the study area.The results show that the kappa coefficient is between 0.768 and 0.796,and the classification consistency of desertification difference index is significant.It is feasible to use DDI model to divide the degree of land desertification.

Mots clés : desert-oasis ecotone; land desertification; temporal and spatial evolution; Desertification Difference Index; Tengger Desert;

Présentation (CNKI)

Page publiée le 29 octobre 2020