以我国南方杉木主产区的典型林场为案例点,基于3种不同立地条件和经营强度的土地类型上进行裸地造林的假设,运用改进的杉木生长模型和修正的Faustman—Hartman模型分析增加碳汇收益对杉木人工林经营的影响。研究发现:考虑碳汇收益将明显增加林地作为资产的价值,林地作为资产的价值增加可能使其他用途的土地转化为林业用地,最优轮伐期也随着碳汇价格的增加而呈延长趋势,但对不同类型林地的影响存在差异。中等和劣等林地的碳汇供给量对碳汇价格的反应更加敏感,为通过市场和价格手段来改变现有林地经营方式进而增加林地的森林碳汇供给提供了可能。杉木林地的碳汇供给量与利率和木材价格呈负相关关系,但是利率和木材价格变化对不同类型林地的影响又各不相同。利率和木材价格变化对优等林地的碳汇供给量影响整体不显著,但在一个较低利率水平下或者木材价格下降的情景下,中等和劣等林地杉木碳汇的供给量大幅度提高。碳汇供给量与利率的变化关系也为采用金融手段来刺激增加森林碳汇提供可能。
Increasing the forest carbon sequestration has become the important measure to meet climate change. To the typical forest of Chinese fir advocate produce in south China as a case, On the basis of assumption about afforestation on bare land at land types with three kinds' site conditions and management strength, this paper uses the improved Chinese fir growth model and the modified Faustman-Hartman model to analyze the impact of increasing carbon sequestration incomes on forest management. The results indicated that consider the carbon yield will increase forest land's value as assets. The increase of carbon sequestration incomes will obviously increase the value of forest land ; the increase of forest land's value as assets may make the lands for other uses transfer to the forest lands, the optimal rotation will show the extension trend with the increase of carbon sequestration's price. However, it has different influences for different kinds of forest lands. carbon supply of average and poor land will be more sensitive to carbon sequestration's price, which also provides the possibility to change the forest land management ways and further increase the forest land's forest carbon sequestration supply by the means of market and price. Chinese fir forest carbon sequestration supply were negatively correlated to interest rate and the price of timber, but the interest rate and the timber price changes on different types of woodland are various. Interest rate and timber price change to good land's forest carbon sequestration supply affect overall is not significant, but at a lower interest rate level or timber price reduce situation, carbon supply of middle and inferior forest land increase. The relation of carbon supply and interest rate change makes using monetary means to stimulate increase forest carbon sequestration as possible.