Tridimensional Green Biomass Measurements Of Badaling Forest Farm Based-on Remote Sensing

Trididimension green biomass (TGB), also named virescence three-dimension quantity, refers to the spatial volume formed by stem and leaf of a plant. The study of the measurement for trididimension green biomass is a basis precondition for the estimation of virescence urban environmental benefit, and also is an important part for urban ecosystem study.Based on previous results, this thesis using modified remote sensing model of TGB measurement of urban greening, calculated TGB by "simulating three-dimensional volume by two-dimensional data". The procedure is obtaining relevant data by field measurement, then establishing equations of "crown diameter-crown height" and equations of "crown-green biomass". Subsequently, it caculates TGB combining result of remote sensing image interpretation before the final GIS-based visualization.The main research contents and results in this paper are as follows:1) The TGB calculation model of different tree species.Based on the field measurement of tally, considering the differences on the spatial volume, the improved crown diameter-height correlation equation and TGB equation were established, according to practical vegetational situation in North China Region. Through verification of the simulation results, the improved TGB equation had better effect of simulation calculation.2) The distribution map of forest vegetation in Badaling Forest Farm.Using remote sensing data, combining forest map, vegetation classification were carried out using mixed-pixel decomposition technology and supervised-unsupervised classification, and forest vegetation classification image of Badaling Forest Farm was obtained.3) The distribution map of TGB in Badaling Forest Farm.On the basis of the improved different tree species TGB equation, statistical calculation of different tree species TGB in unit area were obtained by using plot survey data. Distribution area of main tree species were acquisited, thus the distribution map of TGB in Badaling Forest Farm were calculated by combining forest vegetation classification image.4) The research of TGB measurement not only is important for the establishment of a green database, but also provides an important index for the evaluation of green area. Therefore, it is useful for studying of the green environmental benefit.