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为了对不同管理制度下林地拥有者从事碳交换所需求经济激励进行评价,对森林碳固定作用进行了研究。固碳和木材联合管理的相关成本对构建理想的森林碳交换系统非常重要。本项研究核算了美国怀俄明州3块不同管理措施黄松林地的碳产量和分摊值。管理措施分为;未管理林分、同龄林分(全伐后再生林分)和不同龄林分(选择性采伐)。为了方便比较3块林地的纯收入,采用全部商品生产价格指数,将三块林地的管理成本和收益换算成了2006年实际的美元。用保守的4.5%年利率按年计算了净收益。同龄林分年平均碳产值最高(2.48Mg·ha-1·a1),不同龄林分碳积累量最低(1.98Mg·ha-1·a-1)。或者说,同龄林分分摊的纯收益最高,为$276·ha-1·a-1;而未采取管理措施的林分净收益最低,仅为$64·ha-1·a-1。本研究揭示,在不计交易成本的情况下,每额外固定MgC,每年需增加22美元的投入,因此,鼓励由不同龄管理向未管理林分转变。
In order to evaluate the economic incentives needed by forest owners under different management systems for carbon exchange, the role of forest carbon fixation was studied. The costs associated with joint management of carbon sequestration and timber are important for building an ideal forest carbon exchange system. This study accounts for three different management measures in Wyoming, United States Huang Songlin land carbon production and distribution. Management measures are divided into: unmanaged forest, the same age forest (after the regeneration of full regeneration) and different ages (selective logging). In order to compare the net income of the three woodlands, the management costs and benefits of the three forest lands were converted into actual 2006 dollars using the entire commodity price index. Net income is calculated annually using the conservative 4.5% annual interest rate. The highest average annual carbon yield (2.48Mg · ha-1 · a1) and the lowest carbon accumulation (1.98Mg · ha-1 · a-1) at different ages. In other words, the highest net income spread among the same-age stands was $ 276 ha-1-a-1, while the net non-management net income was the lowest at $ 64 ha-1-a-1. This study reveals that for every additional fixed MgC, an additional investment of US $ 22 is required for each year regardless of transaction costs, thus encouraging the transition from different age groups to unmanaged ones.