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Northwest Normal University (2021)

Research on the Spatial-temporal Variation of Vegetation NDVI and Driving Factors in Northwest China

宋佳颖

Titre : Research on the Spatial-temporal Variation of Vegetation NDVI and Driving Factors in Northwest China

Auteur : 宋佳颖

Grade : Master 2021

Université : Northwest Normal University

Résumé partiel
As the typical inland arid and semi-arid areas,Northwestern China is not only important areas for ecological construction in my country,but also one of the more sensitive areas for global changes.With the development of the society and economy,the economic level of Northwestern China is gradually increasing,but the ecological environment of the whole region has been destroyed,and the ability of grasslands,forests,and wetlands to conserve the ecological environment had declined.However,since the implemention of the ecological project in returning farmland to forest and grassland,the ecological environment of the five northwestern provinces has been restored.With the help of vegetation NDVI(Normalized Difference Vegetation Index),which is an important key parameter of terrestrial ecological process,relying on meteorological monitoring data,geospatial data cloud platform,and geographic information system software,this study explored the interannual scale and spatial distribution of the dynamic changes of vegetation coverage in Northwestern China,analyzed the driving forces that affected the changes from natural and human factors.The main results are as follows :(1)In terms of inter-annual changes,the annual average value of vegetation NDVI showed an increased trend in Northwestern China from 2000 to 2018.In the seasonal changes,vegetation NDVI changed significantly in different seasons,with the highest change rate of vegetation NDVI in summer and autumn while lower in spring,and vegetation growth rate was relatively slow,while NDVI in the growing season showed an increasing trend.(2)In terms of spatial variation,the spatial distribution of vegetation NDVI in Northwest China was significantly different,and the overall characteristic was increased from northwest to southeast.High-value areas of NDVI are concentrated in the Qinling Mountains of Shaanxi,the Qilian Mountains in Qinghai Province,and the Longzhong Plateau in Gansu.Low-value areas are distributed in the deserts and Gobi areas of southern Xinjiang,and sands in northern Shaanxi.Vegetation NDVI which varied and increased slightly are distributed in central Qinghai,Northern Xinjiang,Southern Ningxia basically,vegetation NDVI with significant reduction are mainly distributed in arid areas such as sandy land and Gobi,while areas with significant increase in vegetation are mainly distributed in the plains and valleys of southern Shaanxi,as well as the oasis on both sides of the Tianshan and Kunlun Mountains.

Mots clés : vegetation NDVI ;five provinces of Northwest China ;temporal and spatial variation ;natural factors ;human factors ;

Présentation (CNKI)

Page publiée le 9 novembre 2021