Study On The Aboveground Biomass Model Of Cinamomum Camphora In Urban

Biomass is the basis of the calculation of individual organisms, biological communities and ecosystem productivity, and the carbon storage and the carbon fixation capacity is also calculated by the biomass. The carbon fixation capacity of natural forest vegetation has been studied by scholars from all over the world, the study to the biomass and productivity of man-made forest has become more deeply. Scholars has got some organ biomass models on Pinus sylvestnis var. mongolica, Pinus massoniana, Betula platyphylla. These models provide a good reference for tending man-made forest. Different from the nature forest and the man-made forest, the vegetation in the urban is almost composed of those plants coming from the nearly nurseries. Urban environment is complex, its great influence on plant growth. Camphor is widely used in Shanghai's urban landscape, it is a good tree species, with a certain representation. In this study, we use camphor growing in nursery as the research object, obtained it's biomass in harvest method, and find out the regression equation between the crown and other apparent characteristics. Those regression equations can be combined to the 3S technology to enhance the estimation accuracy of carbon storage and carbon sequestration capacity in the regional scale.To make models between the plant biomass and easily measured factors in the urban environment, people can use those models estimate the carbon fixation of the urban plants more simple and accurate than before. Biomass data were obtained by stand inventory with standard wooden selected by average DBH·Canopy biomass ratio in North-South direction of the standard wooden is insignificant, in the vertical direction, biomass concentrated in the 4.3-6.3 m from the ground space. With the growth of the diameter, the proportion of leaf biomass is stable, branch biomass gradually increased, while the trunk biomass decreased. Regression equations were developed mainly based on linear function, polynomial function, exponential function with biomass as dependent variable. The exponential function is better for the branch biomass,leaf biomass,crown biomass to get the regression equations and exponential function polynomial function is better for the trunk biomass,aboveground biomass to get the regression equations. Take crown width, branch basal diameter, crown diameter, leaf area, diameter at breast height as the independent variables on the branch biomass, leaf biomass, canopy biomass, take leaf area, diameter at breast height, diameter at breast height by the square of height (D2H), as the independent variables on the trunk biomass, take crown and leaf area, diameter at breast height, diameter at breast height by the square of height (D2H), on aboveground biomass fitted regression model.In practice, we can use the exponential function between the aboveground biomass and the diameter at breast height: Y=0.147X2191 to estimate the biomass in a small area, and use the polynomial function between the aboveground biomass and crown diameter:Y=13.097X2-67.03X+90.73 to estimate the biomass in bigger areas. And the function between the aboveground net primary productivity and the diameter at breast height is y=0.0382x2.1396 (R2=0.952, P<0.001)...