The Study Of Biomass And Carbon Storage In The Ecosystem Of Secondary Forests Of Pinus Massoniana, Acacia Confusa Along The Coast

Global carbon cycle is one of the core issues of global climate change research,forest ecosystem carbon global carbon cycle is an important component of the cycle,there is a big uncertainty of the global carbon cycle research currently,This uncertainty exists in the same forest ecosystems in the carbon cycle research,particularly in the performance of the regional forest ecosystem carbon pool size and exchanged with the atmospheric CO₂ flux estimates.Therefore an accurate estimation of the regional forest ecosystem carbon pool and the size of the carbon exchange between the flux has been a forest ecosystem carbon cycle research in the hot and difficult.This paper study on the ecosystem of secondary forests of Pinus massoniana,Acacia confusa. along the Coast,the key points of the forest ecosystem in the diameter of the structure is biomass estimates,the organ stands tree layer of carbon and shrub layer,herbaceous layer of litter and the containing rate of soil carbon,regional forest ecosystem carbon storage density,estimates of carbon reserves in areas such as research,Based on forest resources aimed at the exploration of survey data to estimate the regional forest ecosystem carbon pool of suitable methods,and looks forward to the regional scale for the coastal forest ecosystem function of the carbon pool and the carbon cycle research provide some basic research data,in terms of global climate change Under the coastal ecological and environmental construction,the development of the regional forest ecosystem management strategies,as well as carbon sinks to the Chinese government in the world "carbon sinks trade" negotiations and provide a basis for reference.Now come to the following conclusions:(1)The structure of the stand diameterThe study of stand diameter structure plays a very important role in the forestry production.It can be used to forecast the various bands of vegetation density,it leads to a guide significance to the growth of the determination of intermediate and final results,as well as timber harvest estimates of the budget in the process of tree growth.As a direct impact on tree diameter distribution of the density of the forest and wood density to a large extent and impact of the forest biomass,thus to a certain extent,the future can be predicted forest biomass and carbon stocks,the research results and previous research results based on the coastal masson pine forest tree species in Pinus massoniana and Acacia confusa forest withβdiameter distribution which is a good distribution density function described the diameter of the main tree species distribution of fitting the ecosystem of secondary forests of Pinus massoniana.,Acacia confusa along the Coast scientifically.The research of Meng Xianyu and some other previous researchers shows that regardless of the diameter of approximate normal distribution,left side or right side and the anti-J-decreasing diameter distribution,the use ofβdistribution density function can be achieved very good results of the fitting,and the density distribution function shown great flexibility and good adaptability.(2)Estimation and distribution of biomassThe biomass of layer in the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast is 55.5103 t·hm^-2,followed by Acacia confusa tree layer biomass is 46.544 t·hm^-2,and understory vegetation shrubs and herbaceous layer by layer accounted for only a small proportion of the biomass,litter biomass no more,just only 1.829 t·hm^-2.Using 10 kinds of mathematical models fit the ecosystem of secondary forests of Pinus massoniana,Acacia conf1sa along the Coast's single Pinus massoniana wood biomass and diameter,height relationship between the regression equation,the results show that all a significant level.Return them to power,linear regression,quadratic equations,cubic model fitting results better.From the overall analysis,Power is the best fitting model,which takes a good effect on the various organs of the tree biomass and the total volume,and has excellent applicability and the same conclusions as previous studies.Also,because the Power model to D²H as the independent variables as to the effect of fitting is better than a tree trunk diameter at D to the effect of fitting well.In this paper and the predecessors equations are used by the diameter of D²H as the independent variables,the model of the correlation coefficient is above 0.9,in particular the total biomass of the forest regression equation to a correlation coefficient of 0.97 and above,with high practical value.In the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast, the biomass of Pinus massoniana is in normal distribution.The tree biomass which drive 14 cm to 20cm account for 54.497%of the total biomass of Pinus massoniana.Acacia confusa's biomass also showed normal distribution patterns.The tree biomass which drive 12 cm to 20cm account for 65.481%of the total biomass of Acacia confusa.Biomass is the largest for the diameter of 12 cm of Acacia confusa tree,is 9.11 t·hm^-2,which account for 19.591%of the total forest in Acacia confusa's total biomass.Other Drive of Acacia confusa's biomass level while the diameter of biomass as the center,gradually decreasing to both sides.Generally speaking,In the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast,Pinus massoniana and Acacia confusa.'s biomass in the areas of biomass along with the Drive-growth show a decline in first normal growth pattern.In the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast, the Drive-class plant increases with an average diameter of biomass,but the percentage of organ biomass with the diameter changes showed different trends.Pinus massoniana and Acacia confusa in the biomass in the allocation of organs are the trunk of the largest volume.Sticks,leaves,root biomass are smaller.The roots of Pinus massoniana and Acacia confusa's biomass increased as the increase of the diameter,but the rate of increase is very small,essentially unchanged,the total biomass of trees in the ratio of about 20.000%.(3)The research on rate of carbon containingThe rate of carbon of Acacia confusa in the the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast's confidence interval is[0.4578,0.4733],and 0.45 is out of this range,and the Pinus massoniana's for the confidence interval is[0.4888,0.5136],0.5 is in this range.It can be concluded that the study of the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast of carbon storage reserves should be based on the actual measured to calculate the results,or the average of 0.4656 interval used as conversion factors to estimate the carbon reserves Acacia confusa,and the average interval to 0.5012 as conversion factors to estimate Pinus massoniana's carbon reserves to reduce error.(4)Carbon Storage ResearchIn the the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast,The Pinus massoniana's and Acacia confusa's carbon reserves is in normal distribution. Because of the biomass of the ecosystem in the tree layer of carbon reserves and the distribution of biomass distribution is basicly similar.Pinus massoniana and Acacia confusa forest's layer of carbon reserves is 60.071 t·hm^-2,shrub layer of carbon reserves is 0.547 t·hm^-2,herbaceous layer of carbon reserves is 0.113 t·hm^-2Using 10 kinds of mathematical model fit che the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast's single-diameter wood and carbon reserves,height relationship between the regression equation,the results show that both a significant level.Among Quadratic,Cubic,Power,S-curve model fitting the results of four more ideal,and the correlation coefficient is more than 0.99.although each one in the 10 models of he the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast in tree layer of the forest carbon storage,they are fitting better,but to Power model which fit best,the actual use and application is easier to understand,so we used to estimate Power stands as a model to the tree layer of carbon reserves and the regression equation with a high practical value. Soil carbon storage and soil carbon reduce with the depth of the soil,and soil carbon storage in soil should mainly concentrate on the soil surface.0-100 cm soil in the he the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast's carbon storage is 104.094 t·hm^-2,0-20 cm soil carbon storage is 44.689 t·hm^-2,which's takes 42.931%of the total carbon storage,,20-40cm soil carbon storage takes 30.996%of the total carbon storage, 40-60 cm layer of soil carbon storage takes 19.027%of the total carbon storage,60-100cm layer of soil carbon storage takes 7.046%of the total carbon storage,0 - 40cm of soil carbon storage takes 73.927%of the total carbon storage,and soil surface(0-40 cm)larger contribution to the carbon storage.The results show that the estimated value of he the ecosystem of secondary forests of Pinus massoniana,Acacia confusa along the Coast density basicly close to that of carbon storage in China and around the world an average of forest carbonstorage density.It goes naturally Pinus massoniana and Acacia confusa forest's vegetation density of carbon storage in China is at the average level and the forest cover is relatively good.This also shows that China's coastal regions ofPinus massoniana and Acacia confusa forest potential for the development is relatively large,as well as development of the ecosystem of secondary forests of Pinus massonian.,Acacia confusa along the Coast resources to provide certain basic data to guide Taiwan Acacia masson pine forest along the coast of the operation and management to enable it to bring out the environmental benefits and ecological benefits of ecosystems better.