College of Tourism and Environment, Shaanxi Normal University, Xian, Shaanxi 710062, China;College of Tourism and Geography, Chongqing Normal University, Chongqing 400047, China 在期刊界中查找 在百度中查找 在本站中查找
College of Tourism and Environment, Shaanxi Normal University, Xian, Shaanxi 710062, China;Research Center of Hanshui River Culture, Shaanxi University of Technology, Hanzhong, Shaanxi 71200, China 在期刊界中查找 在百度中查找 在本站中查找
Temperature and precipitation are the main climatic factors affecting regional vegetation coverage. With the time lag correlation method,the correlations between the ten days NDVI(TN)and ten days mean temperature(TT),ten days mean precipitation(TP)as well as the time lag characteristics were analysised based on ten days SPOT VGT-NDVI data,daily air temperature,and precipitation data from 20meteorological stations in Chongqing City and around for the period 1999-2010.The results are summarized as follows: Across the entire study region,both correlations with NDVI existed apparently while air temperature had closer than precipitation,which indicated that the temperature is the limiting factors of NDVI variations across the region;there are significant spatial and temporal variation differences with longger time lag and lower correlations from southeast to northwest;the degree of correlation between NDVI of different vegetation types and air temperature and precipitation is determined by the vegetation's growth characteristics and its water and heat requirement.