Age Effects On Stand Biomass And Carbon Storage Of Larix Olgensis Plantation

The study on forest biomass is very significant in researching forest growth and forest ecosystem diversification. By analyzing the vertical distribution of different components biomass in Larix ologensis plantations with similar site conditions in Dong Zhelenghe forestry centre of Yi Chun, the age sequential of biomass distribute was studied. The rule of forest biomass distribution was explored. It will be the theory for studying the productivity and carbon storage. Simultaneously, it can provide the quantitative gist for evaluating the function of carbon convergence and carrying out the condign forest management measure. The results were:(1) The annual increment of diameter and height current will show descending trend at age 15-18. We must properly foster and cut for stand to enhance the space of nutrition absorbability for trees and accelerate the trees growth. The change of volume will be steady at age 28, and the volume mature age will be 45-48. So we can combine local status to harvest and cut trees probably at 45 to 48.(2)The trunks, bark and living branches biomass were less influenced by age, but the leaves biomass decreased with stand growth obviously in middle-age and mature forest. The thick, medium and fine root biomass decreased with stand age; but the large root biomass increased with age.(3) By using the Principal Component Analysis and the Stepwise Regression method to fix the parameter of the biomass model, and using the Least-Squares regression to calculate the selected parameter and establish the biomass model for the different components of Larix ologensis. The model of over-ground biomass is W=0.0585*(D2H)0.8308*exp(0.0159*A);The model of bark biomass is W=0.0035*(D2H)0.9459*exp(0.0022*A);The model of trunk biomass is W=0.0240*(D2H)0.9020*exp(0.01366*A); The model of dead branches biomass is W=0.0015*(D2H)1.0722*exp(-0.0270*A);The model of living branches biomass is W=0.0160*(D2H)0.6014*exp(0.0429*A);The model of leaves biomass is W=0.0781*(D2H)0.3801*exp(0.0222*A);The model of roots biomass is W=0.0082*(D2H)1.0904*exp(-0.0526*A).(4)The relationship between stand biomass and stock volume is fitted to estimate the stands biomass:W=0.4909M+9.6624, the relative coefficient of which is 0.8893. We know from the estimate results that the total biomass of Larix olgensis young plantations in study areas is 1273.72t, the carbon storage is 656.98t.Total biomass of the middle-age forests is 15480.13t, the carbon storage is7984.65t. And total biomass of the pre-mature and mature plantations is7684.41t, the carbon storage is 3963.62t. Forest biomass and carbon storage will increase as the young forests growing and by new management initiatives aiming to improve stand structure.