Research On Biomass Model Of Acacia In Beijing

This paper, through the concept of biomass research forest biomass of the development process and the research situation at home and abroad, it is concluded that the current forest biomass study existence deficiency. Biomass model is the forest biomass compared popular and effective method, of which the relative growth model of nonlinear model most widely used, also is the most representative. By researching the JiuFeng experimental forest of Beijing yanqing county, xishan forest trees and sihai chinese-foreign industry survey of robinia biomass data acquired as sample trees of biomass model fitting. Through the parameter estimation method, the independent variable selection, model form of analysis to determine the evaluation indexes for Beijing area, the components of robinia tree biomass model Then, based on the method of ChengPing poor al cubic biomass model was improved to compatibility forest biomass model all dimensions, and build compatible robinia biological scale. For standard and Beijing in robinia species distribution research established, on the basis of biomass-volume, and concludes that the ground model part: W=6.908*V0.438, trunk: W=4.963*V0.416, branches: W=1.604*V0.431,leaves:W=0.657*V0.425. Beijing area, among which species embodiment of robinia proportion of total biomass, largest 25.37%, followed by 22.00%, overripe, sapling forest, about the total biomass,19.49% 17.39%, nearly cooked, mid-maturation forest proportion Lin, the minimum total biomass 15.75%. In total biomass, trunk section covers the largest percentage, part on biomass accounted for about 65.29% of the total, followed by branches of the total 25.12% part, which covers an area of upper leaves, about smallest percentage of biomass 527.86 t, accounting for 9.60% of total.