Characteristics of vegetation change and its relationship with climate in the Qilian Mountains over the past 40 years
Under the condition of global warming,the vegetation growth state in the Qilian Mountains has significantly changed.Study-ing the relationship between vegetation and climate in the Qilian Mountains is crucial for ecological construction in northwest China.Based on GIMMS NDVI data and ERA5 temperature and precipitation data from 1982 to 2022,this paper analyzes the variation trend of NDVI in the Qilian Mountains and its correlation with climate factors.The results show that high NDVI values are mainly concen-trated in the eastern section(0.6-0.8),and NDVI values gradually decreased from east to west.Over the past 40 years,NDVI in the Qil-ian Mountains has showed an overall increasing trend,primarily due to its significant increases during the growing season.However,NDVI decreased during the non-growing season in some parts of the middle and eastern Qilian Mountains.NDVI changes in the Qilian Mountains were generally and positively correlated with temperature and precipitation.However,during the growing season,NDVI and precipitation were negatively correlated in the eastern part of the Qilian Mountains,while NDVI and temperature were negatively corre-lated in the western part during the non-growing season.There is a significant coupling mode between NDVI in summer and tempera-ture,precipitation during the corresponding period in the Qilian Mountains.Overall,the increase in temperature and precipitation has been beneficial to the rise in NDVI.However,the increase in NDVI during the growing season in the eastern Qilian Mountains is pri-marily attributed to the rise in temperature.
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万方数据
