Vegetation Dynamics and Its Relationship with Climatic Factors in Southwestern China

The response of the vegetation dynamics to climate variability in the southwestern China was analyzed based on the dataset from remotely sensed data and ground observation data，i.e.，MODIS NDVI data with the spatial resolution of 250 meters and temporal resolution of 16\|day，and meteorological data composed of monthly temperature and precipitation data collected from 121 weather stations spanning periods of 2001\|2013，respectively.Seasonally Integrated Normalized Difference Vegetation Index (SINDVI) utilized linear regression to characterize the trends in vegetation shifts.Anomaly analysis was applied to characterize the yearly average fluctuation.Furthermore，the monthly maximum Normalized Difference Vegetation Index （MNDVI） and meteorological data were employed to calculate the correlation coefficient at different time scales.The results indicate that vegetation coverage has extensive decreased trends in the west of Sichuan Basin，the Dayao Mountain in Guangxi and part of the Yunnan\|Guizhou Plateau.Conversely，it shows an increased trend in the south of Sichuan Basin，the Daba Mountains，the west of Guizhou and the coastal areas in Guangxi.In more than half part of southwestern China，vegetation conditions are positively correlated with accumulated temperatures.But the partial correlation coefficient between vegetation condition and total precipitation has evident differences in regions.