Vegetation Carbon Storage Estimate Of The Main Afforestation Species Of Northeast And Inner Mongolia Forest Region In China

China’s pressure is enormous in reducing carbon emission and increasing sink as the largest developing country. China is also a forestry country, and it’s significant to estimate the carbon sources and sinks potential of forest accurately and reduce the uncertainty in regional carbon balance estimates. The study took northest and inner Mogonlia forest region as study area, and took the main afforestation species Larix、Korean Pine and Pinus sylvestris var. Mongolia as the study objects. The database was composed of the collecting data by published papers and books and the2nd-6th National forest inventory data. The paper conducted research on the biomass estimation parameters and estimate of the forest vegetation carbon storage and density using the way of IPCC-2006Guidelines for National Greenhouse Gas Inventory. The results indicated the following aspects:(1) The research results of biomass estimation parameters showed that:the average BEF of Larix is1.445(1.267-1.517), BCEF is0.629(0.571-0.661)t·m-3, R is0.217(0.164-0.312); the average BEF of KoreanPine1.545(1.285-1.620), BCEF is0.566(0.545～0.572)t·m-3, R is0.241(0.222-0.306); the average BEF of Pinus sylvestris var. Mongolia is1.882(1.164-2.269), BCEF is0.730(0.437-0.888) f m-3, R is0.177(0.051-0.267). The biomass estimation parameters of Larix and Korean Pine have not obvious trend with stand age, while the BEF^BCEF and R of Pinus sylvestris var. Mongolia decreases with the stand age increasing, and gradually stabilized. In addition, the interspecific comparison research indicates Larix and Korean Pine have not the obvious different in BEF and BCEF, but different with Pinus sylvestris var. Mongolia-, Korean Pine and Pinus sylvestris var. Mongolia have significant different in R, but not distinct with Larix.(2) The research results of forest vegetation carbon storage and density showed that:the vegetation carbon storage of the main afforestation species in northeasts inner Mongolia forest region is336.30-402.45TgC during the period from2nd national forest inventory to6th national forest inventory; and the storage reaches the maximum in the period of2nd national forest inventory, minimum in the period of2nd national forest inventory. The vegetation carbon density ranged from32.825tC·hm-2to39.959tC·hm-2, and gradually decreases from the period of2nd to6th national forest inventory. The research on age-class distribution of vegetation carbon storage in the period of6l national forest inventory indicates that the total storage is336.30TgC, including young growth storage49.80TgC, immature forest storage128.72TgC, near-mature forest storage48.27TgC, mature forest storage62.88TgC and overmature forest storage46.63TgC. The immature forest takes largest part of storage as38%. The vegetation carbon density presents a growing trend by the stand age. The density of young growth forest is17.457tC·hm-2, immature forest is30.028tC·hm-2, near-mature forest is45.326tC·hm-2, mature forest is52.028tC·hm-2and overmature forest is56.033tC·hm-2. On this basis, it can increase vegetation carbon sinks as211.83～262.79TgC by the growth of forest assuming that all the trees are harvested after their maturity.