| Abstract:To do the statistical analysis of native species and species composition in urban forest, plots were taken in different forest types. Urban forests were classified into firm attached green spaces, residential green spaces, parks and natural forests.170tree species were observed in70plots, among them,63%were native tree species. In natural forests, most species exists (91) and residential green spaces (76) follows. Parks have the least tree species (65). The proportion of tree species was higher than that of shrub. Residential green space and the park type species have the highest similarity coefficient of0.322among each type of city green space and the similarity coefficient in firm attached green space was0.302. The minimum similarity coefficient in natural forest was0.19. Reordering Hannon-Wiener index, natural forest (2.68)> Park (2.59)> residential green spaces (2.53)> firm attached green space (2.17). Reordering evenness value, park (1.31)> residential green spaces (1.28)> firm attached green space (1.08)> natural forest (1.12). Reordering Simpson’s index, Park (0.79)> residential green spaces (0.78)> natural forest (0.75)> firm attached green space (0.69).Considering the four kinds of soil properties of city green space types in Zhuji city, organic matter content in natural forest and firm attached green space was significantly higher than that of park and residential green space. Alkali hydrolysable nitrogen and available potassium showed no significant difference. Soil in natural forest was low-acid, and what in other forest types were alkalescency. The effective phosphorus content in the natural forest was significantly lower than the firm attached green space and parks. Considering the distribution of soil properties in urban area, soil organic matter content between Taozhu South Road-Huansha South Road area is lower. Soil available potassium content in Xi Shi hometown scenic area, Taozhu hill park area and Wufeng mountain area is relatively low. soil available phosphorus content of the southern region of Taozhu Hill is relatively low.According to the Calculate based on biomass of tree layer and shrub layer from70sample plots, we get the situation of green geostatistical interpolation algorithm based on the biomass spatial. Research shows that, scope vegetation area of Zhuji city is about1148.4hm2, the total biomass is6.38×104t, unit biomass was55.59t/hm2, total carbon storage capacity is3.19×104t T and carbon density is27.80t/hm2. |
