树木碳储量的计算分析及最佳轮伐期的确定

Calculation Analysis of Tree Carbon Stock and Determination of Optimal Rotation Period

摘要: 本文以黄杉、刺槐和落叶松三种树种为例，通过生物量转换因子法探究碳储量与树龄之间的关系。结果表明对于所研究的三种树种的碳储量都随树龄的增长而增加，但碳储存的生长速率并不总是增加的。表明不同树种和不同地区之间的碳储存量和生长速率的变化趋势基本一致，且存在碳储量因素下的最佳轮伐期。为了确定森林的最近轮伐期，分别考虑了两种情况，一种情况为仅考虑经济因素时，可通过林地净现值模型树木的最佳轮伐期。另一种情况为综合考虑碳封存效益和经济效益时可通过归一化处理确定每个树种的最佳轮伐期。结果表明：当经济的权重较高时，最佳轮伐期会变小；当固碳效益的权重较高时，则反之。该工作可为实际森林的最佳轮伐期预测提供理论指导。

Abstract: In this work, the relationship between carbon storage and tree age is explored by the biomass conversion factor method, taking three species of tree species, namely, yellow cedar, black locust, and larch, as examples. The findings revel that the carbon storage of the three species increases with the growth of tree age, but the growth rate of carbon storage does not always increase. Furthermore, the results also show that the change trends of carbon storage as well as growth rate among different tree species and regions are essentially consistent, and there is an optimal rotation period when the carbon storage factor is considered. In order to determine the optimal rotation period of the forest, two cases are considered respectively. One case is that when only economic factors are considered, the optimal rotation period of trees can be determined through the forest net present value model. The other case is that when the carbon sequestration benefits and economic benefits are fully considered, the best rotation period of each tree species can be determined through normalization. The results showed that when the economic weight is higher, the optimal rotation period should be shorter; When the weight of carbon sequestration benefit is high, the opposite is true. This research can be used to provide theoretical guidance for predicting the optimal rotation period of actual forests.