Abstract
The NDVI in northern china is vulnerable and is greatly affected by meteorological factors. In this study, the correlation between changes of NDVI and the major meteorological factors (temperature, precipitation) in northern China in the past 30 years with Trend analysis and partial correlation analysis methods. The results show that: (1) In the recent 30 years, the annual average NDVI in northern China shows an upward trend of volatility, with an annual growth rate of 0.0015, and the overall vegetation coverage increases. (2) In the context of global warming, the average annual temperature in the research area increased significantly, with an average annual growth rate of 0.0353, while the average annual growth rate of precipitation was not significant, with an average annual growth rate of 0.1591. (3) NDVI has a higher correlation with air temperature in high altitude alpine and plateau areas, and a higher correlation with precipitation in grassland and desert grassland areas.
Highlights
Vegetation as a major component of terrestrial ecosystems, it plays a major role in regulating biodiversity, and has an important contribution to earth's climate regulation and soil and water conservation
Normalized difference vegetation index (NDVI) is an important indicator for measuring vegetation coverage, which plays an important role in the research of global and regional land cover, vegetation dynamic change and phenological change [3]
The spatial and temporal variation trend of NDVI and its correlation with meteorological factors were analyzed in 13 provinces in northern China
Summary
Vegetation as a major component of terrestrial ecosystems, it plays a major role in regulating biodiversity, and has an important contribution to earth's climate regulation and soil and water conservation. The dynamic change of vegetation cover is closely related to environmental factors such as climate, soil and water, so it is regarded as the “indicator” of environmental ecology [1]. Zhao et al analyzed the relationship between NDVI and climate in the grassland region of northern China from 2000 to 2010 [5]. The spatial and temporal variation trend of NDVI and its correlation with meteorological factors were analyzed in 13 provinces in northern China. It can provide a basis for the monitoring and protection of vegetation in the north, provide support for the construction of ecological environment and sustainable development
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