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Inner Mongolia Normal University (2021)

Analysis of the Response of Vegetabation NDVI on the Mongilian Plateau to Land Water Store

Titre : Analysis of the Response of Vegetabation NDVI on the Mongilian Plateau to Land Water Store

Auteur : 袁瑞强 内蒙古师范大学

Grade : Master 2021

Université : Inner Mongolia Normal University

Résumé partiel
Water is an important prerequisite for maintaining the growth of vegetation.water availability regulates the growth of vegetation and strongly affects the global carbon cycle.On the other hand,vegetation,as an important part of the terrestrial ecosystem,has the role of connecting ecological elements such as the atmosphere,soil,and hydrology,and plays an important role in regulating water balance on a regional and global scale.Therefore,clarifying the interaction between land water storage and vegetation greenness is particularly important for predicting the future carbon cycle and water cycle,and can provide a scientific basis for regional ecological environmental protection and sustainable development.Based on GIMMS NDVI and GRACE TWSA remote sensing data,this study uses Theil-Sen trend analysis and MK trend test to analyze the spatiotemporal characteristics of vegetation TWSA and NDVI in the Mongolian Plateau.Correlation analysis is used to explore the correlation between the two,and autoregressive model is used to quantify the response of the vegetation ecosystem stability of the Mongolian Plateau to the short-term anomalies of terrestrial water storage anomaly(TWSA)from 2002 to 2015.The main conclusions are as follows :(1)Based on GRACE\TWSA remote sensing data,using Theil-Sen trend analysis and MK trend test to analyze the spatio-temporal change characteristics of vegetation TWSA on the Mongolian Plateau,the results show that the overall TWSA shows a significant downward trend,with a multi-year change rate of 0.715 mm/a(P<0.05).The overall distribution of TWSA shows a decreasing trend from north to south and from northeast to southwest,and shows a relatively high TWSA on the periphery of the plateau,while a relatively low spatial pattern within the plateau.The slope of vegetation TWSA change is stable between-1.55 and 1.42.The TWSA in the study area as a whole shows an increasing trend of the area accounted for45.30% of the total area,of which the significantly increased area accounted for 31.49% of the total area(p<0.05),mainly distributed in Kent Mountain and the Daxinganling Mountains in the east.(2)Based on GIMMS NDVI remote sensing data,using Theil-Sen trend analysis and MK trend test to analyze the spatio-temporal changes of vegetation NDVI in the Mongolian Plateau,the results show that the average annual NDVI value of vegetation in the Mongolian Plateau during the growing season from 2002 to 2015 is 0.26~0.32,As a whole,there is an upward trend of volatility,with a growth rate of 0.02%/10 a,and individual inter-annual changes are relatively volatile.In terms of spatial distribution,it shows strong characteristics of difference,and the overall distribution is zonal decreasing from northeast to southwest.The low-value areas of NDVI are mainly distributed in the Alxa Desert in the southwest.Due to the harsh natural environment in these areas,the NDVI is relatively low.The high value areas are mainly distributed in the forest area and meadow grassland area in the northeast of the Mongolian Plateau.

Mots clés : NDVI ;TWSA;temporal and spatial changes ;correlation analysis ;ecosystem stability ;Mongolian Platea ;

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Page publiée le 7 novembre 2021