Analysis of Spatiotemporal Distribution Characteristics of Vegetation NDVI in Northern Guangdong from 1988 to 2018
Vegetation is a core component of terrestrial ecosystems,and the Normalized Difference Vegetation Index(NDVI)is an important parameter reflecting surface vegetation cover and growth status.Taking northern Guangdong as the research area,combined with long-term NOAA/AVHRR product data and elevation data from 1988 to 2018,this paper uses rate of change analysis and spatial analysis methods to analyze the characteristics of NDVI changes in northern Guangdong over the past 31 years and their correlation with terrain factors.The results show that from 1988 to 2018,the annual average of NDVI in northern Guangdong showed a distribution pattern of high in the north and low in the south,and high in the west and low in the east,and the annual average of NDVI ranged from 0.20 to 0.87.Among them,the annual average of NDVI in Lianshan zhuang and yao autonomous county is the highest,reaching 0.82,while the annual average of NDVI in Qingcheng district,Qingyuan city is the lowest,only reaching 0.68.In 2018,the annual average of NDVI reached its highest level at 0.84;in 1988,the annual average of NDVI reached its lowest level at 0.74.As the elevation increases,the annual average NDVI in northern Guangdong shows an upward trend,and the distribution characteristics of NDVI are influenced by a combination of human activities,terrain,and climate.The research results can provide important theoretical support for the construction of ecological barriers in mountainous cities in northern Guangdong.
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