Research On Typical Stands Biomass And Productivity In DaXing’ Anling Mountain

Forest biomass and productivity is an important part of forest ecosystem carbon cycle and carbon balance. Based on the different area of the Greater Khingan Mountains, temporary sample plots were set, collect DBH data of each plot, combined with biomass model and volume model of different tree species, estimate biomass and volume of typical forest (birches, black birch, Mongolian oak forest, Populus davidiana forest, plantations and natural larch forests, plantations and natural Mongolian pine forests), analysis the relationship between wood density (WD), root-shoot ratio (R), biomass expansion factors (BEF), biomass conversion and extension factor (BCEF) of different forest types and forest volume (V). Detect carbon content of typical tree organs (stem, root, leaf, branch). Analysis carbon content of typical tree species from different regions; Use increment core of typical species, analysis tree diameter growth, estimate the typical forest productivity in different areas. The results showed that:1) The biomass parameters change with volume increase of typical forest are different. BEF of birches tend to be constant and other parameters with the decreasing parabolic type. Black birch forest WD and BCEF with the increase of V reduced, R and BEF has a rising trend. Mongolian oak forest WD, R, BEF, BCEF respectively showed linear rise, reduce, constant, upward trend; Populus davidiana forest in addition to the BEF tend to be constant, showed parabolic type, larch parameters trend to be constant; artificial and natural Mongolian pine forests parameters change with Vtrend is relatively consistent, all show the parabolic type.2) Carbon content of typical tree species are difference in 9 areas of Greater Khingan mountains. The carbon content result detected by dry method is higher than the wet method, with smaller changes in scope. Organ carbon content of typical species are differences. Various species of different organs carbon content changing with longitude are characterized by the change tendency of the parabola, each organ carbon content is higher at 124° east longitude. Each organ carbon content of different species vary with latitude are not identical, larch carbon content increases with latitude, mongolica and birch organs of parabolic upward trend; black birch and Alnus sibirica is parabolic type change trend, carbon content is higher around 52° north latitude; Aspen and Mongolian oak are characterized by linear increase trend. Severe typical species each organ carbon content changing with altitude changes mainly for parabolic trend; Carbon content is higher at 600 m altitude.3) The difference of productivity between typical forest in different regions of Greater Khingan mountains is obvious. DBH growth of advantage tree species is different. Conifer DBH growth were higher than that of hardwood; Conifer plantations DBH growth were higher than that of natural forests; there were no significant difference between hardwood; The volume of the same area productivity is differences between different forest types, age group, plantation is higher than the natural forest, broad-leaved forest was higher than coniferous forest. But in terms of biomass growth, natural forests were higher than plantations, coniferous forest was higher than broad-leaved forest. Typical forest carbon sequestration in different regions exist significant differences, Ii-2b, Ii-3a and Ii-3b area amount of forest carbon sequestration is significantly higher than other areas. The carbon sequestration differences between areas of different forest types, coniferous forest is significantly higher than broad-leaved forest, plantations are higher than the natural forest. Birches, Populus davidiana forest carbon sequestration is higher, young growth forest and mid-maturation forest is higher.