共查询到20条相似文献，搜索用时 156 毫秒
1.
2.
伐区调查设计是林业生产的先行工序。伐区调查设计成果是编制企业计划、科学组织及指挥木材生产和合理经营森林的基础和依据。为了准确地反映伐区森林资源情况和合理的组织木材生产,伐区调查设计成果必须真实,同时必须符合技术上先进,经济上合理的原则。为此就伐区设计谈几点看法。 相似文献
3.
4.
林木出材率和伐区剩余物的调查研究 总被引：1，自引：0，他引：1
本文通过对湖南省三个重点林区县森林采伐的林木出材率和伐区剩余物的实地调查与分析研究,为木材生产年产量计算和人造板工业利用伐区剩余物提供了计算依据。 相似文献
5.
6.
露水河林业局在党的十一届三中全会以前的一段时间里,重采轻育,采好不采坏,采近不采远,不但给木材生产造成了很多困难,而且使生态平衡、永续利用受到了干扰。该文从调整采伐量、选择伐区作业方式和提高道路质量与管理,来解决当前木材生产中的矛盾,提高森林经营水平。 相似文献
7.
8.
9.
10.
11.
木材储备基地及其多功能森林经营建设对策 总被引：2，自引：2，他引：0
木材战略储备基地作为林业产业发展的重大举措被列入我国“十二五”林业发展规划,以应对我国木材自产不足、外供不济的安全保障问题,但面临速生丰产林用地有限、社会对森林综合需求增加、生产成本上升、效益低下等因素制约。文中在分析木材储备的特征及其森林经营需求的基础上,提出以林分状态存在的活立木储备是低成本、环境友好型、有战略意义的木材储备,而且木材储备基地是一种以物质生产功能为主导的多功能用材林模式;在此基础上,进一步提出了通过建设有生命活力和结构稳定的用材林生态系统来实现有经济效益的木材战略储备基地的多功能森林可持续经营对策。 相似文献
12.
《Scandinavian Journal of Forest Research》2012,27(2):105-120
Abstract This paper comparatively examines two forest management planning approaches: multipurpose forest management and traditional timber management, with carbon, timber and oxygen production objectives in mind. The effects of both approaches on carbon and oxygen values were estimated with an oxygen and carbon flow matrix, while timber production was modelled through a growth and yield model. The estimated values were simultaneously integrated into a linear programming model developed for this study. The objective was to maximize the net present value (NPV) of the profits of timber, oxygen and carbon under the constraints of an even flow of timber production and ending forest inventory for each planning approach. The results showed that the ecological and environmental regulations in multipurpose management substantially decreased the NPV of timber production even though they increased the NPV of carbon and oxygen flow. The results also indicated that over a 100 year planning horizon the total NPV of all forest ecosystem values including carbon, timber and oxygen is almost the same (only 1.9% reduction in multipurpose management approach) in both management approaches. Although multipurpose management creates more NPV of carbon and oxygen than timber management does, the latter provides better results in terms of timber production. It is therefore important to take into account the NPV of all apparent and quantifiable forest values in preparing forest management plans, particularly in developing new management planning approaches. 相似文献
13.
Jorge Aldea Fernando Martínez-Peña Luis Diaz-Balteiro 《European Journal of Forest Research》2012,131(6):1991-2003
Some non-timber forestry products, such as mushrooms, have not typically been included in forest management plans, creating a scenario whereby timber production is the main objective and fungal resources are an afterthought. However, in certain forests, wild mushrooms reach a significant level of production. This paper researches a strategic forest management plan that would include the production of both timber and mushrooms as principal objectives while still adhering to constraints normally considered within forest management. A case study is provided featuring two main groups of edible wild mushrooms, where the two aforementioned objectives have been optimised individually. Lacking a satisfactory solution for the decision-maker, a model based on multi-criteria decision analysis (compromise programming) has been constructed to yield more attractive solutions. Information regarding mushrooms is based on the actual amount collected in the forest and not on potential production. Measured in monetary terms, mushroom production can be easily compared with timber production. Income associated with mushroom production is equal to approximately 20 % of that generated by timber throughout the planning horizon when final inventory and regulation constraints are imposed. 相似文献
14.
《Scandinavian Journal of Forest Research》2012,27(2):120-127
Abstract This study quantified, across a landscape in Eastern Finland, the influence of administrative land-use and technical land-form constraints on timber production. Spatially explicit data about the nature conservation areas, land use plans and steep slopes were integrated with Multi-source National Forest Inventory (MS-NFI) data. The Finnish forestry model MELA was used in the calculations related to updating forest data and estimating different scenarios of timber production with and without constraints. In the study area, the annual volume of maximum sustainable cutting removal defined for the next 30 years was decreased by one-third due to restrictions. The presented approach could be used, for example, to assess timber availability at the landscape level. Future challenges include ensuring the compatibility of spatially explicit data obtained from different sources, identifying the feasibility of forest management operations in the restricted area, and incorporating near-nature forest management operations in the forest planning system in order to estimate the timber production. 相似文献
15.
Cornelia Fürstenau Franz W. Badeck Petra Lasch Manfred J. Lexer Marcus Lindner Peter Mohr Felicitas Suckow 《European Journal of Forest Research》2007,126(2):225-239
In this study, the overall utility of forest management alternatives at the forest management unit level is evaluated with
regard to multi-purpose and multi-user settings by a multi-criteria analysis (MCA) method. The MCA is based on an additive
utility model. The relative importance of partial objectives of forest management (carbon sequestration, ground water recharge,
biodiversity, and timber production) is defined in cooperation with stakeholders. The forest growth model 4C (Forest Ecosystems
in a Changing Environment) is used to simulate the impact of six forest management strategies and climate on forest functions.
Two climate change scenarios represent uncertainties with regard to future climatic conditions. The study is based on actual
forest conditions in the Kleinsee management unit in east Germany, which is dominated by Scots pine (Pinus sylvestris L.) and oak (Quercus robur L. and Quercus petraea Liebl.) stands. First, there is an analysis of the impact of climate and forest management on forest functions. Climate change
increases carbon sequestration and income from timber production due to increased stand productivity. Secondly, the overall
utility of the management strategies is compared under the priority settings of different stakeholder groups. From an ecological
perspective, a conservation strategy would be preferable under all climate scenarios, but the business as usual management
would also fit the expectations under the current climate due to high biodiversity and carbon sequestration in the forest
ecosystem. In contrast, a forest manager in public-owned forests or a private forest owner would prefer a management strategy
with an intermediate thinning intensity and a high share of pine stands to enhance income from timber production while maintaining
the other forest functions. 相似文献
16.
17.
利用林分生长过程表确定林分生长发育过程,在森林资源资产评估、安排森林经营措施、计算蓄积量、材种出材量和确定森林采伐量等生产经营过程中有着极其重要的作用。本研究以河北省塞罕坝主要天然次生林（白桦,山杨,柞树）为研究对象,在收集多年调查的临时样地数据的基础上,进行筛选、分析,从中选出584块符合条件要求的样地,借助Excel、SPSS11．0和ForStat统计分析软件,对中等立地条件下各树种的主要林分调查因子进行方程拟合,并对生长方程进行检验,分别编制了林分生长过程表,为该地区主要天然次生林的生长收获预估等森林经营活动提供了理论依据。 相似文献
18.
加拿大森林资源丰富,经营粗放。保持竞争优势,增加木材产量,发挥多种效益是森林经营的目标。为此,加拿大正在就森林经营方式展开争论。 相似文献
19.