Vegetation change and its response to climate factors in Hanggin Banner,Inner Mongolia,China from 2000 to 2020
Compared to other terrestrial ecosystems,desert steppe transition zone ecosystems are highly vulnera-ble and exhibit heightened sensitivity to climate change.Therefore,long-term protection and attention is impor-tant.In this study,Hanggin Banner at the edge of Hobq Desert in Inner Mongolia was selected as the research ar-ea.Utilizing the Google Earth Engine(GEE)remote sensing cloud computing platform,we analyzed the vegeta-tion change trends in Hanggin Banner by employing the Normalized Difference Vegetation Index(NDVI)from the MOD13Q1 series dataset during 2000-2020.Additionally,we monitored the vegetation evolution pattern us-ing Fraction Vegetation Coverage(FVC)derived from a binary the study period.This analysis was supplemented by spatial transfer matrix and barycentric migration models to elucidate changes in NDVI characteristics within Hanggin Banner.Furthermore,annual precipitation average annual temperature data were utilized to investigate correlations with vegetation normalization index trends in Hanggin Banner.The results indicated the following:(1)Overall,there was a gradual increase in vegetation in the region,with an average annual change rate of 0.0021,demonstrating significant improvement.The vegetation cover was higher in the southeast and lower in the northwest.(2)From 2000 to 2020,Hanggin Banner witnessed considerable enhancement in vegetation cov-erage,with medium vegetation covering more than 50％of the total area.While low vegetation coverage de-creased significantly by 62.35％,there was a slight decrease of 36.39％in high vegetation coverage.However,other grades experienced an increase in their respective coverages,particularly high vegetation which saw a re-markable rise of 150.12％.Moreover,areas with high and medium vegetative coverage tended to expand from north to south while those with medium and low vegetative coverage expanded.(3)There were distinct regional variations observed regarding the partial correlation between NDVI and climate factors.At an inter-annual scale,precipitation had a more pronounced impact on vegetation changes,and the correlation coefficient R reach 0.8 with NDVI,thus indicating that precipitation serves as the primary driving force behind changes in NDVI.
Google Earth EngineNDVIfraction vegetation coveragespatial-temporal changeHobq Desert
NETL
NSTL
万方数据
