Vo Dai Hai, Dang Thinh Trieu
Forest Science Institute of Vietnam
Research on carbon sequestration of the forest is one of the important research activities serving as a basis for the identification of forest value and establishment of a mechanism for environmental services. This issue was and is being paid attention by the Government of Vietnam and the world in the recent years. The research is implemented under framework of a research subject entitled: "Research on carbon sequestration and commercial value of a number of major forest plantations in Vietnam " managed by Ministry of Agriculture and Rural Development. The research method applied is to set up 12 temporary plots per site class with 1000 m2 in area (20m x 25m) lasses. Two average sample trees per plot are selected to identify fresh and dry biomass. In each plot set up 5 secondary plots 25m2 in area in 4 corners of the plot and one in central of the plot to collect biomass of bush and grass. In each secondary plot set up 5 plots 1m2 in area to collect twig and litter fall. Carbon content in different components of the tree and in the forest soil is analyzed in the laboratory.
Research result shows that content of carbon quantity in individual Pinus massoniana trees varies greatly according to different site and age classes. Carbon quantity concentrates in stem (57.0% in average), next is carbon quantity in branches (18.2% in average), carbon in roots (9.9%), carbon in leaves (9.0% in average) and carbon in bark (5.9%).
Carbon quantity in bushes and the grass layer under Pinus massoniana forest canopy is concentrated mainly in stems and branches (occupied 32.44%), carbon in bush roots occupied 31.87%, carbon in grasses occupied 21.97% and in bush leaf occupied 13.72%. Carbon amount accumulated in branches fall is about 45.31%, carbon in other component of litter layer is 54.69%. With the total Pinus massoniana forest, carbon is concentrated mainly in the tree layer, where the average is about 54.44% and carbon in the forest soil occupied 37,01%, follows by carbon in twig and litter layer occupied 5.878% on average and carbon in bush and grass layer occupied smallest amount with 2.69%.
There is closed relationship between dry biomass and fresh biomass of individual trees with inventory factors such as diameter, total height, age; this relationship is expressed by Power and S equations with high correlation coefficient, low standard deviation; These equations can be used for quick calculation and forecast of individual tree biomass basing upon inventory factors like diameter, total height, age or calculate biomass under ground from biomass above ground, from fresh biomass to dry biomass.
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