Correlation Analysis of Spatio-temporal NDVI, Air Temperature, Precipitation, and Ground Temperature in the Bayinbuluk Grassland
In the Bayinbuluk Grassland of China, the growth status of vegetation is directly concerned with the productivity of stockbreeding. NOAA/AVHRR is an important means of monitoring the growth of vegetation in that region. Through a statistical analysis of 20 years NOAA/AVHRR images-extracted NDVI, we find that the area of vegetation cover is unsteadily expanding. Through the year- and month-scaled correlation analysis of spatio-temporal NDVI, air temperature, precipitation, and ground temperature, we find that air temperature and shallow ground temperature are two dominated factors of promoting vegetation growth in the Bayinbuluk Grassland. Again, the thawing frozen earth affects ground temperature and enriches soil water for promoting vegetation growth. This paper gives us some evidence of Bayinbuluk Grassland ecological changes by building relations of spatio-temporal NDVI and the climate factors like air temperature, precipitation, and ground Temperature.