Global vegetation change analysis based on MODIS data in recent twelve years①

Vegetation cover change is critical for understanding impacts and responses of vegetation to cli -mate change .A study found that vegetation in the regions between 45 °N-70 °N was increasing using normalized difference vegetation index (NDVI) from 1981 to 1991 ten years ago.The global vegeta-tion growth has changed because of climate change in recent twelve years ( 2001 -2012 ) .After thorough analysis based on satellite data , it is found that it is evident that the global vegetation changed ( NDVI) little, and it is increasing slightly in Northern hemisphere while it is decreasing slightly in Southern Hemisphere .For different latitudes , vegetation is increasing 0.17%every year from 60°N to 70 °N (R2 =0.47, P>0.013), while the vegetation is decreasing 0.11%every year from 10°N to 10°S (R2 =0.54, P >0.004).For different continents, the vegetation in South America is decreasing 0.16%every year (R2 =0.78, P>0.0001) and it is increasing 0.05%ev-ery year in Asia (R2 =0.28, P>0.072) and 0.25% every year in Oceania (R2 =0.24, P>0. 1).The analysis of global vegetation in different seasons indicates that spatial distribution of global temperature and water vapor will affect the spatial distribution of vegetation , in turn, the spatial dis-tribution of vegetation will also regulate the global temperature and water vapor spatial distribution at large scale .The growth and distribution of vegetation are mainly caused by the orbit of the celestial bodies , and a big data model based on gravitational-magmatic change with the solar or the galactic system as its center is proposed to be built for analyzing how the earth ’ s orbit position in the solar and galaxy system affects spatial-temporal variations of global vegetation and temperature at large scale .These findings promise a holistic understanding of the global climate change and potential un-derlying mechanisms .