SPATIAL-TEMPORAL CHANGE PATTERNS OF VEGETATION AND THE INFLUENCE OF CLIMATIC FACTORS IN YUNNAN PROVINCE, CHINA FROM 2000 TO 2020

Vegetation is extremely important for the ecosystem, it is an important link that connects soil, organisms, and the atmosphere. As plants perform photosynthesis, carbon cycle and energy ex-change, they play a balancing role for global ecological changes. Based on the datasets of MODIS Normalized Difference Vegetation Index (NDVI) and the daily meteorological data from 25 weather stations in Yunnan province, China, the spatial and temporal distribution characteristics of NDVI over a 21-year-period were studied, and the response relationship between NDVI and climate factors. The monthly and yearly spatial distribution pattern of NDVI was further explored using the standard deviational ellipse. Besides, the changing trend, stability, and characteristics of the future changing trend of the vegetation NDVI were evaluated through Sen+MK, coefficient of variation, and the Hurst index in Yunnan province, China. A partial correlation analysis was carried out using the NDVI data based on the temperature and precipitation from 2000 to 2020. The center of gravity of Yunnan is mainly from south-west to north-east, and the trend for the NDVI during the past 21 years mostly improved. However, in the future, the vegetation may follow the trend of degradation, and the study area is more affected by temperature. In recent years, the average temperature throughout the world has been on the rise due to global warming, which has elicited the response of vegetation to climate change in advance. The vegetation in Yunnan is showing an increasing trend, Moreover, it is particularly important to protect the ecological environment in the protected region.