Study On Biomass Of Three Forest Types In Jingouling Forest

In this study, forest biomass of the major forests types in Jingouling forest, i.e., natural spruce-fir forest, polar-birch secondary forests and artificial larch forest were analyzed quantitatively by classical ecology theory. The study also explored a new research method based on the forest database at stand scale. Dynamic simulation for tree biomass at different forest stand types were studied comprehensively and systematically for the first time. It has the vital academic interest and the practical value to evaluate the forest biomass and carbon sequestration function of northeastern China. Meanwhile, this study supplies scientific evidence for forest resources protection in other areas. Main results were as follows:(1) The models for total aboveground biomass and each organ biomass of the main trees in Jingouling forest were fitted by using the data of clear cutting plots. The optimal equations were obtained by the accuracy test. The aboveground optimal biomass models of10main tree species were Abies nephrolepis (M5,R2=0.987), Acer mono (M21,R2=0.952), Betula costata (M5,R2=0.986), Betula platyphylla (M20,R2=0.995), Fraxinus mandshurica (M6,R2=0.984), Larix olgensis (M20, R2=0.956), Picea koraiensis (M20, R2=0.990), Pinus koraiensis (M5, R2=0.995), Populus davidiana (M20, R2=0.983) and Tilia amurensis (M20,R2=0.979), resepectively.(2) The total aboveground biomass was387.553kg that was estimated by using the optimal model. The aboveground biomass range of each clear cutting plot was from86.92to160.592kg ha-1and average per hectare was110,729kg. Abies nephrolepis had the most aboveground biomass, accounted for up to28.96%(32,062kg ha-1) of the total aboveground biomass. The following was Picea koraiensis25.76%(28,527kg ha-1), followed by Pinus koraiensis15.12%(16,744kg ha-1). The last one was Larix olgensis, only0.19%(209kg ha-1). Among all the species, Larix olgensis trunk accounted for the largest proportion of its own total aboveground biomass, about83.24%. Tilia amurensis bark and branches accounted for the largest proportion of its total aboveground biomass, about14.47%and17.27%. However, the leave of Picea koraiensis accounted for the largest proportion of its total aboveground biomass, which was about11.79%.(3) Compared the aboveground biomass of clear cutting plot with that of neighboring region, the results suggested, a) the biomass of this cutting plot was less than natural primitive forest stand, but higher than that of artificial forest stand, b) the biomass of this cutting plot was higher than that of in average broad-leaved tree stand, coniferous and broadleaf mixed forest stand and other needle stand in the same area, c) the biomass of this cutting plot was higher than that of average deciduous broadleaf forest, spruce-fir forest and korean pine forest, d) compared with different countries in average, the biomass of this cutting plot was higher than in Korea and Japan, even higher than the average of the global total forest biomass.(4) A system of simultaneous analysis, namely’dynamical model’was obtained by fitting the height and crown features of the main tree species and combining tree volume equation in it, in addition to q value theory and equation for each tree species biomass. Then the maximum biomass value of three tree species in different q value by the dynamical model and the maximum biomass curve model were calculated out. The maximum biomass curve model of spruce-fir forest, polar-birch secondary forests and artificial larch forest were Y=3552713.56-4556777.99X+1529854.91X2(R2=0.997),Y=1938026.88-2465222.23X+820532.23X2(R2=0.997) and Y=3552713.56-4556777.99X+1529854.91X2(R2=0.997), respectively. When q value decreasing from1.50to1.10, the aboveground biomass of spruce-fir forest, polar-birch secondary forests and artificial larch forest increased from92Mg ha-1to312Mg ha-1,83Mg ha-1to221Mg ha-1and153Mg ha-1to402Mg ha-1, respectively.(5) After analysis of the data of118plots (25plots of spruce-fir forest,36plots of polar-birch secondary forests and57plots of artificial larch forest), the root/shoot ratio were obtained. The root/shoot ratio of spruce-fir forest, polar-birch secondary forests and artificial larch forest were0.2464±0.06,0.2164±0.05and0.2442±0.08respectively. The underground biomass was calculated out by combining their aboveground biomass.(6) The optimal biomass equation of the major shrub and young tree of different types of forests were established by using the biomass data of Jingouling forest. Meanwhile total shrub biomass of different types of forest in different canopy density was estimated. Then herbaceous layer biomass situation of different types of forest was calculated out by quadrat method. The optimal young tree biomass model of each organ and aboveground and underground biomass were model12(Y=a×H b×CAc×CVd×De) and model13(Y=a×(D2H)b). The accuracy of model of young tree was higher than shrub. The shrub biomass situation of three tree species was spruce-fir forest in0.6canopy density (2410kg ha-1)>1.0canopy density (1921kg ha-1)>0.8canopy density (1735kg ha-1), polar-birch secondary forests in0.8canopy density (2523kg ha-1)>0.6canopy density (1845kg ha-1)>1.0canopy density (1203kg ha-1) and artificial larch forest of53year (1952kg ha-1)>39year (320kg ha-1)>19year (0.85kg ha-1). The herbaceous layer biomass situation of three tree species was spruce-fir forest in0.6canopy density (911kg ha-1)>0.8canopy density (813kg ha-1)>1.0canopy density (751kg ha-1), polar-birch secondary forests in0.6canopy density (970kg ha-1)>0.8canopy density (458kg ha-1)>1.0canopy density (428.24kg ha-1) and artificial larch forest of53year (1972kg ha-1)>39year (1366kg ha-1)>19year (64kg ha-1).