A PRELIMINARY REPORT ON CORTICOLOUS LICHENS IN DONGLING MOUNTAIN,BEIJING,CHINA Impacts of population spatio-temporal dynamics on ecosystem quality during  fast urbanization in Beijing, China. Soil aggregate stability and soil organic carbon characteristics in Quercus variabilis and Pinus tabulaeformis plantations in Beijing area. Recreational attraction of urban park wetlands in Beijing. Applicability of traditional landscape metrics in evaluating urban heat island effect. Correlation between atmospheric PM2.5 concentration and meteorological factors during summer and autumn in Beijing, China.