Abstract: In order to understand the ecological differentiation of plants within phosphorusenriched mountainous areas, four dominant species (Eupatorium adenophorumm, Rumex hastatus, Saccharum rufipilum, and Coriaria sinica) were selected from phosphorus-enriched mountainous areas that have various soil phosphorus contents in Dianchi watershed. The plants from six populations of each species were planted in a homogeneous garden. Single factor analysis of variance, coefficient of variation, and correlation analysis were applied to study the ecological differentiation among the populations of each of the four dominant species. The results showed that interpopulation variations in all morphological traits (plant height, leaf area, specific leaf area, leaf dry matter content) were significant for the four species. Interpopulation variations in E. adenophorumm, R. hastatus, S. rufipilum, and C. sinica were 16.80%, 4.58%, 24.01%, 9.42%, and the intrapopulations were 59.86%, 66.17%, 63.15%, 68.51%, respectively. The results suggested that the adaptation of dominant plants in phosphorus-enrich areas to local heterogeneous environments is not only characterized by the response in phenotype, but also by certain genetic differentiation.

Key words: street canyons, diffusion simulation, air quality, development trend