摘 要

1 绪论 1

1.1 问题的提出及研究意义 1

1.2 国内外文献综述 1

1.2.1 碳汇 1

1.2.2 杨树碳汇的研究 2

1.2.3 轮伐期 3

1.2.4 国外的碳汇以及轮伐期研究 4

1.3 成熟龄讨论 5

1.3.1 经济成熟龄 5

1.3.2 数量成熟龄 5

1.3.3 工艺成熟龄 5

1.3.4 经济、数量、工艺成熟龄的讨论 5

1.4 研究思路和框架 6

1.5 研究的创新以及不足 6

2 杨树经济及碳汇价格估算方法 7

2.1 不同轮伐期杨树碳价格估算 7

2.1.1 杨树含碳量估算方法 7

2.1.2 碳价格估算方法 8

2.2 不同轮伐期杨树经济价值估算方法 8

2.3 基于碳汇下的杨树经济成熟龄估算方法 8

3 不同轮伐期杨树成本与价值的估算 10

3.1 杨树种植的总成本 10

3.2 碳汇价值 10

3.2.1 杨树的基本数据 10

3.2.2 杨树各器官生物量 11

3.2.3 杨树的碳储量及碳汇收益 12

3.3 不同轮伐期杨树的经济价值估算 13

3.3.1 杨树的价格 13

3.3.2 杨树种植的利润 13

4 杨树最优轮伐期的确定 15

4.1 杨树经济成熟龄 15

4.2 基于碳汇下的杨树经济成熟龄 15

4.3 杨树数量成熟龄的确定 17

4.4 杨树工艺成熟龄的确定 18

5 结果分析与展望 19

5.1 研究结论 19

5.2 未来展望 19

参考文献 23

基于木材和碳汇联合生产角度的杨树经济轮伐期确定

摘 要

目前，全球的生态环境面临着重大的压力，温室气体的不断排放导致了全球气候的升温，如何加大对森林的保护已经成为了全人类的一个重要任务。本文研究的是基于碳汇和木材下的杨树经济轮伐期确定，可以在保证经济发展的基础上对环境进行一定的保护。同时，也能适当兼顾杨树产量。

本文将先利用杨树胸径、树高模型计算出其生物量，再利用碳-生物量转换系数0.5求出杨树的碳储量，进而算出杨树的碳汇价值。通过净现值法与内部收益率法确定杨树是经济成熟龄；根据平均生长量与连年生长量曲线相交的交点确定数量成熟龄；通过绝对削切公式求出杨树的工艺成熟龄，最后综合考虑杨树的最佳轮伐期。

最后得出的结论：第一，在不考虑碳汇下杨树经济成熟龄为9年，数量成熟龄为12.5年，工艺成熟龄约为15年；第二，当木材加工对木材要求不高时，最优轮伐期为9年；要求较高时，可以适当向后延长轮伐期，最多为15年。第三，当加上碳汇收益后杨树的经济成熟龄为10年，且内部收益率与净现值都有了一定的提高。

关键词：杨树；碳汇；轮伐期

The economic rotation period of poplar was determined based on the joint production of wood and carbon sink

Abstract

At present, the global ecological environment is facing significant pressure, the continuous emission of greenhouse gases has led to the global warming of the climate, how to increase the protection of forests has become an important task for all mankind. This paper will study the determination of economic rotation period under the consideration of poplar carbon sink and wood, which can protect the environment to some extent on the basis of ensuring economic development. At the same time, also can give due consideration to poplar yield.

In this paper, the DBH and height models of poplar were used to calculate its biomass, and the carbon-biomass conversion coefficient 0.5 was used to calculate the carbon reserves of poplar, and then the carbon sink value of poplar was calculated. The net present value method and internal rate of return method were used to determine the economic maturity age of poplar. The maturity age was determined according to the intersection point of average growth and continuous growth curve. The mature age of poplar was obtained by absolute cutting formula, and the optimum rotation period of poplar was considered.

The final conclusions are as follows: first, without considering the carbon sink, the economic maturity age of poplar is 9 years, the quantity maturity age is 12.5 years, and the technological maturity age is about 15 years. Second, when the requirements for wood processing are not high, the optimal rotation cutting period is 9 years. If the requirement is higher, the rotation period can be extended back to 15 years at most. Third, when the carbon sink income is added, the economic maturity age of poplar is 10 years, and both the internal rate of return and the net present value have been improved to a certain extent.