Study on Forest Management Plan Based on Forecast of the Carbon Sequestration and Comprehensive Value

Carbon sequestration by the forest and its products can help to reduce carbon dioxide. However, when trees age, they will release the carbon accumulated in the body. So it raises the problem that how to make trees into products at the appropriate amount and time and make an effective forest management plan. Firstly, "DBH-Biomass-carbon sequestration" model is developed to calculate the amount of carbon sequestration of a tree at different ages. Then we predict the total carbon sequestration of a forest in the next 100 years, assuming that the age distribution of a forest obeys a normal distribution, and the best cutting time for a tree is when its marginal carbon sequestration is zero. Besides carbon sequestration, we introduce ecological, economic, and social dimensions to evaluate the comprehensive value of forests, and use the multi-objective planning model to obtain the optimized annual deforestation plan which take ecological, economic, and social dimensions into account. Finally, we select Tianshan Spruce Forest to apply the above models. The results show that the carbon sequestration of spruce began to decline after the age of 21. compare two management plans, one is to cut down spruce trees older than 21 years old every year and the other is to neither cut nor plant, we find that the forest carbon sequestration amount in 100 years for plan one and two is 4571t and 1728t, respectively.