According to the cultivating practice ofLarix olgensis pulp plantation, IRR (Internal revenue rate) and NPV (Net present value) were taken as two economic indices to study the effect of cultivation measurements on eco...According to the cultivating practice ofLarix olgensis pulp plantation, IRR (Internal revenue rate) and NPV (Net present value) were taken as two economic indices to study the effect of cultivation measurements on economic benefit ofLarix olgensis pulp forest. The results showed that the economic benefit of this type of forest is closely related to rotation and site class. Higher economic benefit could be obtained when the rotation is shorter and site class is higher. The planting density also had an obvious influence on economic benefit. On the base of assuring survival rate and conserving rate, the less the fee used in soil preparation and young growth tending is, the higher the economic benefit is. The influence of determined six cultivation measures on economic benefit in sequence was the rotation—site class—density—management fee level—young growth tending intensity—soil preparation methods.展开更多
This paper introduces the general condition of forestry resources of China and the demand and supply of timber and forest products. The market for timber and forest producls has borne dual pressure because of the popu...This paper introduces the general condition of forestry resources of China and the demand and supply of timber and forest products. The market for timber and forest producls has borne dual pressure because of the population explosion and growth of the domestic economy. A major contemporary strategy for sustainable forestry includes the promotion of the Forest Products Industry (FPI), the substitution of other materials for timber,and the encouragement of imports of timber and forest products. The author analyzes the effect of these policies on the market for timber and forest products. In addition, the difficulties encountered by most mid-to large -scale state- owned forest enterprises during the transition from a centrally-planned economy to a market economy are examined. Finally, the author points out the countermeasures and means for reform of these old forest enterprises with a view toward future prosperity of the market for timber and forest products.展开更多
除自然干扰外,木材采伐是最能减少森林碳储量的人类活动之一。尽管目前大部分碳核算方法,均认为经由“可持续”管理的森林砍伐,其造成的温室气体排放可以忽略。但这种净碳核算的方法,并未赋予森林重新增长和未采伐森林的碳储存能力任何...除自然干扰外,木材采伐是最能减少森林碳储量的人类活动之一。尽管目前大部分碳核算方法,均认为经由“可持续”管理的森林砍伐,其造成的温室气体排放可以忽略。但这种净碳核算的方法,并未赋予森林重新增长和未采伐森林的碳储存能力任何价值。本研究以思茅松人工林生产一次性卫生用品为例,在CHARM模型的基础上结合产品生产消费特性,考虑时间的因素,估算人工林砍伐碳成本。结果表明,思茅松人工林的采伐碳成本为4.2~16.6 t C/ha,证实了采伐行为会造成碳损失,为进一步完善我国目前纸浆、纸、纸制品碳足迹核算方法提供了一定的参考。展开更多
基金Sciences and Technology Office of Heilongjiang Province (G99B5-10).
文摘According to the cultivating practice ofLarix olgensis pulp plantation, IRR (Internal revenue rate) and NPV (Net present value) were taken as two economic indices to study the effect of cultivation measurements on economic benefit ofLarix olgensis pulp forest. The results showed that the economic benefit of this type of forest is closely related to rotation and site class. Higher economic benefit could be obtained when the rotation is shorter and site class is higher. The planting density also had an obvious influence on economic benefit. On the base of assuring survival rate and conserving rate, the less the fee used in soil preparation and young growth tending is, the higher the economic benefit is. The influence of determined six cultivation measures on economic benefit in sequence was the rotation—site class—density—management fee level—young growth tending intensity—soil preparation methods.
文摘This paper introduces the general condition of forestry resources of China and the demand and supply of timber and forest products. The market for timber and forest producls has borne dual pressure because of the population explosion and growth of the domestic economy. A major contemporary strategy for sustainable forestry includes the promotion of the Forest Products Industry (FPI), the substitution of other materials for timber,and the encouragement of imports of timber and forest products. The author analyzes the effect of these policies on the market for timber and forest products. In addition, the difficulties encountered by most mid-to large -scale state- owned forest enterprises during the transition from a centrally-planned economy to a market economy are examined. Finally, the author points out the countermeasures and means for reform of these old forest enterprises with a view toward future prosperity of the market for timber and forest products.
文摘除自然干扰外,木材采伐是最能减少森林碳储量的人类活动之一。尽管目前大部分碳核算方法,均认为经由“可持续”管理的森林砍伐,其造成的温室气体排放可以忽略。但这种净碳核算的方法,并未赋予森林重新增长和未采伐森林的碳储存能力任何价值。本研究以思茅松人工林生产一次性卫生用品为例,在CHARM模型的基础上结合产品生产消费特性,考虑时间的因素,估算人工林砍伐碳成本。结果表明,思茅松人工林的采伐碳成本为4.2~16.6 t C/ha,证实了采伐行为会造成碳损失,为进一步完善我国目前纸浆、纸、纸制品碳足迹核算方法提供了一定的参考。
