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Lanzhou University (2017)

A Comparison Study on Pastoral Desertification and Oasis Desertification

陈利珍

Titre : A Comparison Study on Pastoral Desertification and Oasis Desertification

Auteur : 陈利珍

Grade : Master’s Theses 2017

Université : Lanzhou University

Résumé partiel
Desertification is one of the worldwide eco-environment problems.According to the statistics of United Nations Environment Programme(UNEP),1/3 of the land area are affected by desertification in the global.Pastoral area,taking use of natural grassland as a resource operate the animal husbandry and taking grazing as the main means,is based on the vast natural grassland and produced goods,such as livestock,breeder,draft animals.Oasis is the most concentrated and the most frequent area of human activity in arid areas,so the analysis of pastoral and oasis desertification is so necessary and urgent.In this study,the pastoral and oasis,respectively,take Maqu County and Minqin County for example,the TM image as the data source,RS and GIS as the technical means to study the evolution processes and regulations of desertification in Maqu County and Minqin County from 1975 to 2015,combining with the meteorological and socioeconomic data to explore the driving forces of pastoral desertification and oasis desertification and having a comparative study of pastoral desertification and oasis desertification.The preliminary findings are as follows:1.The temporal and spatial changes of desertification in Maqu county and Minqin county from 1975 to 2015.The total desertification area of Maqu County decreased 487.2km2 and Minqin County increased 203.39km2,but the degree of desertification decreased in Minqin County.Maqu county,taking 1995 as turning point,which desertification was expanding during 1975 to 1995 and reversing from 1995 to 2015.The desertification of Minqin County was expanding from 1985 to 1995,and the remaining three periods for the reversal of desertification.Among which,the effect of desertification control was significant from 1995 to 2005 in Minqin County and in Maqu County.The land use reserved a slow changing trend in Maqu County and Minqin County.The moderate desertification migration distance in Maqu County was the farthest,but the light desertification migration in Minqin County was the furthest.2.Analysis on the driving forces of desertification in Maqu County and Minqin County.The changes of temperature,precipitation and relative humidity in the climate factors of Maqu County and Minqin County indicate that the climate of Maqu County has gradually developed into the warm and dry direction and Minqin County has gradually developed toward the warm and wet direction,which further indicating that the climate condition of Maqu County is not conducive to the reversal of desertification and conducive to the reversal of desertification in Minqin County.Combined with the human factor,using the principal component analysis method inferred that from 1975 to 2015,the highest factor loading of the first factors of Maqu County and Minqin County were the total population and the number of sheep at the end of the year.After adding two factors of cultivated land and groundwater exploitation,it concluded that the highest factor loading of the first factors were ground water exploitation ;From 1975 to 1995,the highest factor loading of the first main factors were the total population in Maqu county and Minqin county.From 1996 to 2015,the highest factor loading of the first main factors were the number sheep at the end of the year in Maqu county and GDP in Minqin county.In summary,the occurrence and development of desertification was the interaction of human activities and climate change in Maqu County and Minqin County from 1975 to 2015,and the main driving force was the unreasonable activity of human beings.3.A comparative study on desertification in Maqu County and Minqin CountySimilarities : In the aspect of the temporal and spatial change and monitoring time of Maqu county and Minqin county,the largest desertification area and the highest desertification degree was in 1995

Mots clés : Pastoral Desertification; Oasis Desertification; Maqu County; Minqin County; Comparative Study;

Présentation (CNKI)

Page publiée le 4 septembre 2017