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Chengdu University of Technology (2020)

Vegetation Growth and Its Response to Climate Change in Different Eco-regions of Inner Mongolia

罗琳玲;

Titre : Vegetation Growth and Its Response to Climate Change in Different Eco-regions of Inner Mongolia

Auteur : 罗琳玲;

Grade : Master’s Theses 2020

Université : Chengdu University of Technology

Résumé partiel
Located in the northern frontier of China,the Inner Mongolia is an important ecological security shelter,with its unique natural habitats and abundant natural resources.Terrestrial vegetation plays pivotal roles on land-atmosphere interactions,and even global climate change.Monitoring the tempo-spatial distribution,changing trend and driving mechanism of the vegetation growth is of great significance for ecological environment assessment and protection of the Inner Mongolia.This paper constructed a vegetation growth index(GI)model based on MODIS remote sensing data,and analyzed the temporal and spatial variation characteristics of vegetation growth in forest eco-region,grassland eco-region and desert grassland eco-region in Inner Mongolia from the years of 2001 to 2017.Combined with the data of air temperature and precipitation in the study area,the correlation analysis method is used to study the time lag of vegetation growth to climate change.The study area is finally zoned into different parts according to the driving climatic factors to vegetation growth on the basis of lag analysis.Based on the results of lag analysis,the climate-driven zoning of vegetation growth was preliminarily divided,and the spatial and temporal characteristics of vegetation growth response to different climate factors were quantitatively demonstrated and evaluated.The main conclusions are as follows :(1)The vegetation GI showed an uptrend with a growth rate of 0.037/10 a in recent 17 years in Inner Mongolia.The differences of variation rate and fluctuation range are significant in the eco-regions.The eco-regions orders of increased rate are desert grassland eco-region(0.048/10a),grassland eco-region(0.034/10a)and forest eco-region(0.032/10a).The spatial distribution of the mean GI showed the characteristics of south-high and north-low during the growing season,with significant regional differences.The eco-regions orders of vegetation growth were desert grassland eco-region,forest eco-region and grassland eco-region.(2)As a whole,the vegetation GI was dominated by no significant change(54.70%)and increase(43.93%)in Inner Mongolia in the last 17 years.The vegetation GI in the forest eco-region in the last 17 years was dominated by increased significantly.There was no significant change in vegetation GI in most regions of the grassland eco-region and desert grassland eco-region.The overall vegetation growth in the study area showed positive persistence(95.63%).In the future,about 50.47% of the regional vegetation GI will continue to have no significant change,and 43.83% of the regions will continue to increase.

Mots clés : vegetation growth; climate change; driving factors; MODIS; Inner Mongolia;

Présentation (CNKI)

Page publiée le 22 mai 2021