Distribution Of Carbon Storage For Larix Olgensis Plantation Of Different Stand Ages

With the rapid development of industrialization and urbanization, forest vegetation deterioration is becomming more and more intensively, which has a strong effect on equilibrium state of forest carbon cycle, And now, the rise of CO2 content in the atmosphere has become an acknowledged fact. Consequently, greenhouse effect is one of the most crucial global environmental issues presently. As the largest carbon pool of terrestrial ecosystem, the allocation dynamics of biomass and carbon stock of forest ecosystem are important components of global carbon cycle. Based on the data of stem analysis and biomass from 67 sample trees in 22 sample plots for the Larix olgensis plantation with different stand ages in Dongzhelenghe forestry centre of Heilingjiang province, the paper developed the biomass predicting models of single larix olgengsis tree and stand biomass prediction models. The biomass of shrub, herbage and woody bebris was measured by the methods of quadrat, centre and transect sampling. By the carbon content determined for different layers and different components, this paper synthetically studied the distribution characteristics of carbon stock of standing vegetation(including arbor, brush and herbage) and woody debris of larix olgensis plantation for different stand ages. The study not only can accumulate initial information of forest carbon cycel at the regional scale, but also Can contribute to sustainable development of running and managing forest ecosystem.The main results as follows:(1)The biomass of mean individual and total biomass of arbor layer was respectively 142.374Kg and 142.910 t·hm-2 for larix olgensis plantation. respectively. Every organ biomass of tree went up with the rise of stand age. There were correlations among main oragn biomass of vegetation in arbor layer and stand factors.(2)Undergrowth biomass under larix olgensis plantation ranged from 1.757 t·hm-2 to 10.56 t·hm-2 for different stand ages (including 7,19,24,33 and 46). With the exception of the undergrowth biomass for 7 year, it was in the order brush biomass>herb biomass. And the biomass of undergrowth underground was higher than that of aboveground.(3)Stock of CWD and FWD of the Larix olgensis plantation ranged from 0 t·hm-2 to 13.960 t·hm-2 and from 2.926 t·hm-2 to 18.562 t·hm-2 respectively. respectively. CWD was mainly comprised of snags and logs. The biomass of woody debris increased with the stand ages rising.(4) Average carbon content rate of larix olgensis plantation at the same stand age was in the order arbor layer>CWD>shrub>FWD>Herb, and average carbon content rate of the same layer fluctuated indistinctively with stand ages. The carbon storage density of larix vegetation for different stand ages ranged from 4.636 t·hm-2 to 176.748 t·hm-2. Vegetation carbon storage density of the same stand age was in the order arbor layer>woody debris>shrub layer>herb layer, with the exception of the vegetation of density in 7 year. In addition, vegetation carbon storage density of the same layer increased dramaticly with the stand age increasing.