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Northeast Agricultural University (2018)

Study on Dynamic Change of Land Desertification in Inner Mongolia

丁雪;

Titre : Study on Dynamic Change of Land Desertification in Inner Mongolia

Auteur : 丁雪;

Grade : Master’s Theses 2018

Université : Northeast Agricultural University

Résumé
Land desertification is the most difficult ecological-economic-social problem in the world,threatening human survival and development.China is one of the countries with the most serious desertification problems in the world.Desertification can cause land degradation,declining soil quality,lower vegetation coverage,and bring disasters such as sand and dust,which seriously restricts the development of social economy.As the second largest province of desertification in China,Inner Mongolia,in recent years,desertification control has achieved some success.It is an area where desertification control has achieved remarkable results in China.However,the trend of desertification in some regions is still very severe.The study of the driving force of desertification is the basis of desertification research.The impact of climate change and human activities is the main driving force for the reversal or development of desertification.Inner Mongolia has a vast territory and a wide distribution of deserts,according to geographical divisions and the characteristics of desert formation,different sandy regions are divided.Starting from the sandy region scale,exploring the main driving factors for desertification in different sandy areas is of great significance for desertification control.Multiple linear regression models can be used to quantitatively analyze the significance of desertification driving factors in different sandy regions.This paper takes the Inner Mongolia Autonomous Region as the research object,taking 1985-2015 years as the research time point,comprehensively uses mathematical models,GIS,SPSS and other technologies to systematically analyze the changes in the amount and direction of land desertification changes in different sandy regions.On the basis of above,the multiple-regression model was used to analyze the main drivers of desertification change in various sandy regions,then,specific suggestions and proposals for desertification control were proposed.The main research contents and conclusions of this paper are as follows :(1)The spatio-temporal variability of desertification in sandy regions in Inner Mongolia has significant spatial heterogeneity.On the time scale,the total area of desertification land in Inner Mongolia increased from 555,200 km 2 in 1985 to 624,600 km 2 in 2015,but the desertification reversal area was larger than the development area,among which,the reversal area of desert within different grades was up to 112,400 km 2.The reversal and development of desertification land are mainly based on the changes between adjacent grades,and the greatest changes are in desertification of grassland and reversal of desertification of all grades to grassland.On the spatial scale,the overall importance degree of desertification declines,and the reversal areas are concentrated in the sandy regions of erdos,wlcb,and alsh.The development areas are concentrated in the hsdk and the west of the hlbr sandy regions.(2)The reversal and development of land desertification are mainly driven by factors such as precipitation,sunshine,temperature,wind,urbanization level,cultivated land development level,number of livestock raised,and afforestation area.The results of the study indicate that the driving factors for desertification vary in different sandy regions.The development of desertification in hlbr is mainly driven by rainfall,artificial afforestation area,and crop cultivation area.The main driving force for the development of desertification in the hsdk is wind,the main driving force for desertification change in kerq is rainfall and large livestock numbers,the main drivers of desertification change in charis rainfall and sunshine levels,the main driving forces of desertification in the three adjacent sandy regions of wlcb,nmhs and htpy are rainfall and artificial afforestation.The main driving force of desertification in the wmt is rainfall,and the driving force of desertification in the alsh includes sunshine and temperature in addition to rainfall.The reversal of desertification in erdos is mainly driven by artificial afforestation,urbanization,and animal husbandry.(3)In terms of land desertification control,the study area has already implemented series of measures such as closing mountains,afforestation,and grass,building key ecological projects,and preventing desertification.However,in hsdk,western hlbr,desertification is still severe.In the future,desertification control should make full use of the experience of sand control in erdos,in order to uphold airborne afforestation,sand transport roads,water controland industrial sand control.Based on the sand control measures,we pay equal attention to both ecological and economic benefits,seek forest sand research and development of high-end industrial development,introduce professional and technical personnel,realize sand control and sand use,continuously increase the added value of sand industrial products,and promote the sustainable development of the environment in the Inner Mongolia Autonomous Region.

Mots clés : Desertification; Spatio-temporal evolvement; Driving force; Inner Mongolia; Quantitative evaluation;

Présentation (CNKI)

Page publiée le 28 mai 2019