关键词: 回归, 回归

Abstract:

In order to quickly and accurately extract vegetation situation, analyze vegetation change, protect vegetation and provide favorable environment for survival of mankind, this research used 10-day SPOT VEGATION NDVI time-series data and meteorological data from 1998 to 2007 in chengde district of hebei province, using correlation analysis and multiple linear regression methods, to analyze vegetation change and correlations between NDVI and driving factors including air temperature, precipitation and land surface temperature of chengde district during these 10 years. The results showed that vegetation grew best in July and August every year. The lowest value of NDVI appeared in 2000, the highest value of NDVI appeared in 2005. Correlation between vegetation and temperature, precipitation and surface temperature were weak positive, and also were significant linear relationship. The correlation between annual average NDVI and annual average temperature was higher（0.24）than that of precipitation（0.07）and surface temperature（0.02）. Significant NDVI change in 2005 was mainly distributed in the north of chengde district, that is to say, bashang area in fengning and weichang counties. Vegetation grew better in area of temperature 20-24℃, surface temperature 20-30℃ and 10-40 mm precipitation. In space, vegetation in the study area was affected by air temperature more significantly than precipitation and surface temperature.