樟子松碳汇价值的长时间尺度模拟分析（英文）

Dynamic Simulation of Carbon Sequestration by Pinus sylvestris var. mongolica

森林生态系统具有重要的碳汇作用。目前,碳汇价格可以通过碳交易、碳税和固碳项目实际成本3种机制实现。本研究从森林植被碳汇功能发挥的过程出发,认为森林植被碳汇价值包括碳固定价值和碳蓄积价值两部分。在此基础上以樟子松(Pinus sylvestris var.mongolica)为例,采用固碳项目实际成本,模拟了森林植被在100年的生命历程中碳汇价值的动态变化过程。研究表明,单株樟子松碳固定的物理量和价值量动态过程曲线都呈倒"U"型;碳蓄积的物理量和价值量动态过程曲线都近似呈"S"型。在碳固定和碳蓄积价值叠加下,碳汇价值流量过程曲线近似呈"S"型,且逐渐趋近碳蓄积价值流量曲线。100年内,樟子松的碳汇总价值(资产价值)随着林龄逐渐增大,其中碳蓄积价值所占的比重逐渐增加。樟子松林分碳汇价值曲线与单株树木的曲线不完全相同,但是基本形态一致。

Based on the functional process of carbon sequestration of forest, we categorize carbon sequestration in two parts： carbon capture and carbon storage. Here,Pinus sylvestris var.mongolica was used to simulate the dynamic changing process of carbon sequestration of forest in a century using tree growth formula and the cost of carbon capture and sequestration. We found that the total carbon captured and stored by 100-year-old P. sylvestris var.mongolica are both 966 kg C tree^-1. On the assumption that the current year is the planting year, the present total carbon sequestration value （capital value） of 100-year-old P. sylvesrtis var.mongolica is 54.78 USD tree^-1 at the discount rate of 3%, with the present total carbon capture value of 18.92 USD tree^-1 and carbon storage value of 35.86 USD tree^-1. The dynamic process of the annual value of carbon capture is ilustrated by an upside-down U shape curve, while that of carbon storage service folows an S shape curve. The combination of the dynamic processes of carbon capture value and carbon storage value represent the changing process of carbon sequestration value, which appears to be an S shape curve.