Abstract: Frequent and intensive human activities have caused enormous ecological and environmental pressures in Bohai Rim region. Based on the 2000-2005 SPOT-VGT dataset with 1 km spatial resolution and other data such as landform, climate, population, economy, land use, and transportation data, and by
the methods of global ordinary least square (OLS) and geographically weighted regression (GWR), this paper quantitatively analyzed the correlations of the NDVI in five provinces and municipalities of Bohai Rim with altitude, slope, temperature, precipitation, population density, GDP density, land use degree, distance to cities, and distance to main roads. Comparing with linear regression model, GWR model gave a much better fitting result, with the goodness of fit increased significantly from less than 0.3 to more than 0.7. Among the most sensitive factors affecting NDVI, positive factors were mainly altitude, temperature, and precipitation, while negative factors were mainly population density and GDP density. The regions where NDVI was positively sensitive to altitude were distributed in Liaohe Plain, hilly areas to the south of Changbai Mountains, and transitional zone from Yanshan to west coastal plain of Bohai bay, positively sensitive to temperature mainly located in southern Hebei Province and eastern coastal areas of Shandong Peninsula, and positively sensitive to precipitation were in Yanshan, north Taihang Mountains, and Zhangbei highland areas; while the regions where NDVI was negatively sensitive to population density and GDP density almost covered the whole Bohai Rim region except southern Hebei and northwestern and southwestern Shandong Province.

Key words: Simulated acid rain, Dimorcarpus longana Lour cv wulongling, Chloroplast activity, Photosynthesis