Biomass and structure of natural forest in Dong Son - Ky Thuong Natural Reserve Area, Quang Ninh
Keywords:
Carbon sequestration, environment control, structureAbstract
Dong Son - Ky Thuong Natural Reserve Area has an area of 15.593,81 ha, including poor forest (TXN) of 45.16%, woody-bamboo forest (HG) of 26.19%, medium forest (TXB) of 11.52%, and very poor forest (TXK) of 8.62%. Thirty five typical temporal plots were established for identifying species and measuring diameter at breast height (DBH) and stem height for all stems with DBH ≥ 5 cm, which was used for individual aboveground biomass (AGB) estimation. The results indicated the significant differences among four forest types in species number, stem density, and AGB. The highest were found in TXB (41 species, 965 trees/ha, and 119.2 tons/ha, respectively) and the lowest in TXK (18 species, 408 trees/ha, and 25.2 tons/ha, respectively). Stem-diameter distribution of HG had inverted-J shape with peak at 10 - 15 cm DBH, while TXB, TXN and TXK had exponential shape with the numerous stems at 5 - 10 cm DBH. It is concluded that forests at Dong Son - Ky Thuong Natural Reserve Area has stable structures, which can support forests grow and develop to fulfil its functions on environment, ecology, and carbon sequestration against globa l warming and climate change
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