The Response Of Vegetation At Same Latitude To Climate Change In Qinling Mountains

The Qinling Mountains are important demarcation line of China,s North and South, and sensitive to climate change. The natural reserve areas in Qinling Mountains possess high vegetation coverage and less human interference, therefore, the responses of vegetation variation to climate change can reflect the real situation in Qinling Mountains. Based on the month atmospheric temperature, precipitation and MODIS NDVI data sets from2000to2010with correlation analysis and linear regression of one variable technique, the response of the Spatial-temporal characteristics of vegetation cover variations in three natural reserve areas in which latitude nearly to the temperature changes, and the difference of responses, were analyzed in this paper. Main conclusions are follows:(1) The distribution and variation of temperature and precipitationBy comparing the inverse distance weighting method and Kriging interpolation method and found that the latter is more suitable for the needs of this study; The annual, quarterly and monthly average temperature of there natural reserve areas, have shown the law of diminishing from east to west. The changes in mean annual temperature, there have more than70%of there natural reserve areas was not a significant warming trend, but in comparison, the western changes more dramatic than in the east; Fall season average temperature change to the maximum temperature rise in all seasons, but not significant; January and July temperatures changed, but the changes are not significant.The multi-year average precipitation ranked in the order of Huangguan, Zibai and Tianzhu natural reserve area.(2) The spatial-tempoal distribution and variation of vegetation indexIn the previous year, quarter, month timescale, the average NDVI of Tianzhu Mountain natural reserve area is lowest because of it,s time of established, but presented a significant growth trend; The annual maximum NDVI of theropencedrymion in three specific vegetations and Huangguan natural reserve area in three natural reserve areas is highest. In terms of the same type of vegetation changes in annual maximum NDVI, Tianzhu expressed a significant growth trend, and others were not; In terms of the same altitudinal gradient changes in annual maximum NDVI, in addition to the1000-1500m gradient in Tianzhu Mountain pressented a significant growth trend, there is no significant difference in the other elevation gradient.(3) The responses and it,s difference of NDVI in different spatial and temporal scales to temperatureThe correlation coefficient between annual NDVI and annual temperature in all regions concentrated from-0.3to0.63, and area of significant positive correlation in Huangguan is as high as2.5%; Monthly NDVI variation have positive correlation with annual temperature in three natural reserve areas, especially between last April NDVI and March temperature, which indicated the response of monthly NDVI to temperature reflected a month lag.Annual maximum NDVI of three specific vegetation in Zibai and Tianzhu have significant correlation with temperature from last February to January, Huangguan showed from last March to February, this suggested that the response of annual maximum NDVI of three specific vegetation to temperature fall behind10-11months in several natural reserve areas.Annual maximum NDVI of different altitudinal gradient in Zibai have the most significant correlation with temperature, but the correlation of Huangguan is weak and irregular because of stable vegetation cover and fluctuations of annual maximum NDVI.