Study On The Compiling Of Aboveground Biomass Yield Table Of Deciduous Broadleaf Forest Stand In Mazongling Forest-Farm

The growth dynamics of stand can be effectively monitored and predicted by the stand growth and yield models,which is of great significance to the prediction of forest harvest and the sustainable management of forest resources.In this thesis,the deciduous broadleaved forest in Mazongling Forest-farm was taken as the research object.Through the establishment and investigation of standard plots,the aboveground biomass of the stand was calculated,Furthermore,the site index model was developed.The stand average DBH growth model,the average tree height growth model and the aboveground biomass model of the stand were built based on site index,and the experience yield table of the aboveground biomass of the stand was compiled;At the same time,to build the stand density index model,and the stand variable density aboveground biomass yield model was built based on stand density index and site index.Finally,the stand aboveground biomass variable density yield table was compiled.The main research results are as follows:（1）According to the survey data of the standard plots,the average DBH of the stand were divided into 18 diameter classes,and each diameter class was given a stand age,which solved the problem that the age of the uneven-aged forest was difficult to determine,and provided a basis for the construction of site index and stand growth model.（2）The site index was expressed by the relative dominant tree height method,and the stand dominant tree height growth model:H_T=17.5756(1-e^-0.3488·t)^1.3675.The site index model was derived by using the dominant tree height growth model:SI=H_T(1-e^{-0.3488·t₀})^1.3675/(1-e^-0.3488·t)^1.3675（3）Stand number and volume model:N=9256.0818 D^-0.9661 H^0.1947 M=0.0001 D^2.4176 N^1.0770（4）Stand average DBH,tree height growth model and aboveground biomass model based on site index:D（?）=0.7526 SI^0.0144e^{1.9649 t0.2394} （?）=4.1371 SI^0.4993e^{-1.5310 e-0.1904·t} W=1.9251 （?）^-0.3754 （?）^0.3492 N^-0.1001 M（5）Stand density index prediction model:SDI₂=SDI₁/(e^{3.5863 SI0.0037/t₁-0.2163}e^{3.5863 SI0.0037/t₂-0.2163})The stand average DBH,basal area and aboveground biomass yield model based on site index（SI）and stand density index（SDI）:D=0.7603 SI^{0.0128e1.9675·t0.2174 SDI0.0135} G=3112.8368 SI⁽0.0017(1-e-3.0199E-8（SDI/1000）^3.2903t))^0.3017 W=81.0702 SI^{0.6273e-3.1759 t-0.5896（SDI/1000）0.8499}（6）Based on the above models,the experience harvest table and variable density harvest table of aboveground biomass of deciduous broad-leaved forest stand were compiled.