Relationship Between Meteorological Factors And NDVI Over Daxinganling In Heilongjiang Province

Normalized difference vegetation index(NDVI)can reflect the condition of vegetation growth.Using the monthly data of MODIS/NDVI between 2001 and 2015,contemporaneous data of meteorological factors data and Arctic Oscillation data,The relationship between NDVI and meteorological factors of Daxinganling is analyzed.The variation characteristics of NDVI in Daxinganling are analyzed in different seasons and months with meteorological factors.The results show that:between 2001 and 2015,different seasons' distribution characteristics of NDVI in Daxinganling have much difference.The regional differences are not obvious in the same season.from November to March,the NDVI distribution in Daxinganling have little difference.Between April and October,the distribution of NDVI in Daxinganling have significant difference.The relationship between NDVI and meteorological factors in Daxinganling is analyzed.The results show that:NDVI is correlated with temperature between February and November.For example,the R2 between the July temperature and the July NDVI is 0.69.the July temperature can account for 69%of the NDVI change in July.The R2 between the June precipitation and the July NDVI is 0.40.The precipitation in June could account for 40%of the NDVI change in July.The correlation between NDVI and temperature is higher than that of precipitation.?NDVI variation refers to the current month's NDVI value minus the last month's NDVI value.The relationship between NDVI variation and meteorological factors in Daxinganling is analyzed.The results show that:NDVI variation is correlated with temperature in some month.For example,the R2 between the July temperature and the August NDVI variation is 0.61.the July temperature can account for 69%of the NDVI change in August.the R2 between the June precipitation and the July NDVI is 0.458.The precipitation in June could account for 58%of the NDVI change in July.The correlation between NDVI variation and temperature is higher than that of precipitation.AO is a hemispheric scale climate change model.It can affect the climate of the northern hemisphere.The relationship between AO and the NDVI in Daxinganbling is analyzed.The results show that:NDVI of Daxinganling in Heilongjiang province is related to AO,which is away from it at thousands of miles.During the growing season,the R2 between the March AO and the April NDVI is 0.70.the AO in March is able to account for 70%of the NDVI change in April.A preliminary analysis of the impact mechanism shows that:the AO can affect the temperature in Daxinganling in Heilongjiang province and the temperature can affect NDVI of Daxinganling,so AO can affect NDVI of Daxinganling by affecting the temperature of Daxinganling.This study provides a new perspective for forestry workers,which is of great significance for managing and utilizing the forest resources.