Willow production related to climatic variations in Southern Sweden

The aim of this study is to quantify the variations of energy forestry production at different locations in south Sweden that can be expected because of variations in climate only. The growth of first‐year shoots of willow (Salix viminalis) is simulated by means of a model based on photosynthesis. The production is examined over a 15‐year period and at 13 different locations. The mean yearly stem production ranged between 10.0 tonnes of dry matter per hectare and year at Helsingborg and 6.5 tonnes per hectare and year at Hagshult. The yearly variation was within ±25 % for sites located in the inland areas while those at the coast generally showed variations within ±15%. On a regional basis, Skåne had the highest mean production with 9.4 tonnes per hectare and year while the production of the Mälardalen region was about 13% lower. The difference in production between Mälardalen and Östergötland was about 2%. A sensitivity analysis showed that the growth response of clones to temperature might be an important selection criterion when aiming at increasing the production.     

林木联合采伐机底盘的研究现状与发展趋势

林木联合采伐机是一种多功能、高自动化、高效率的林木采伐机械,其底盘作为基本组成部分将直接影响林木联合采伐机在林地的作业范围和行驶性能.介绍了目前国外林木联合采伐机底盘的分类、发展现状和未来趋势,为我国开发适合国情的林木联合采伐机底盘提供一定的参考.     

低碳经济视野下森林旅游发展探讨

发展低碳经济已得到政府和社会各界的广泛关注,低碳经济已经成为经济发展的必然趋势。旅游业作为第三产业的重要组成部分,是低碳经济的有机组成部分。从需求意愿、驱动机制、开发模式和评价指标体系几个方面对森林旅游低碳化发展的研究内容进行探讨,以期对森林旅游低碳发展相关研究提供借鉴。     

林业生态工程监理存在的问题与对策

依据我国现行建设法规和林业政策及造林技术规范与标准,结合甘肃省林业生态工程监理的现状,阐述了目前在林业生态工程建设监理中存在的问题以及采取的对策。     

加强林业基层推广工作存在的瓶颈与对策

通过对林业基层推广工作的分析,探讨林业基层推广工作存在的包括推广方式、劳动力、经费等方面存在的瓶颈,并针对存在的问题提出解决策略。     

Testing Stewardship Concepts on Federal Land

Summary

The goal of this paper is to describe recent attempts to define the stewardship concept and to translate it into action on the ground. The focus is on national forest lands and the unique challenges federal land managers face in working with the public to implement a concept that has different meanings to a variety of stakeholders. Stewardship requires more flexibility than is often found under existing administrative authorities. Large, bureaucratic agencies face many barriers in applying creative and innovative solutions to existing problems, not the least of which are internal and external reward structures. While there exist some authorities that allow for the creative testing of stewardship contracting projects on the ground, a number of challenges remain. Two significant ones are: (1) the need for a clearer, consistent understanding (by both Forest Service employees and constituents) of the authorities that can be used to test stewardship concepts; and (2) a more broad-based agreement on the desired outcome of stewardship projects. Given the current lack of understanding and agreement on how to implement stewardship concepts, the most effective means of moving the issue forward will be to apply innovative tests of contracting methods under current or new temporary authorities. These tests should be designed, implemented, monitored, and evaluated using broad-based, inclusive, on-the-ground coalitions that create effective ties and linkages between local and national levels.     

河南省平原区林业生态屏障建设分析与评价

通过对河南省平原区林业生态屏障建设现状的调查,论述了林业生态屏障对平原区的重要影响,同时指出了目前林业生态屏障建设存在的主要问题,以期引起有关部门的关注。     

林用绞盘机的使用与维修

对两种林用绞盘机的结构、性能、使用和保养方法进行了深入研究，其中的使用和保养方法是多年生产实践经验的总结，对正确使用和保养林用绞盘机有重要的指导作用，同时对提高林用绞盘机的使用寿命也有一定的参考价值。     

我国林业外来有害生物的入侵与防范措施

主要是对当前我国外来有害生物的入侵并蔓延原因进行分析,并提出对外来有害生物的防范措施。     

切实加强森林资源管理 提高凭证采伐率

凭证采伐率是体现一个地方森林资源管理的重要指标，文章对重点林区凭证采伐率的现状及下降原因作了分析，提出提高凭证采伐率的对策，这对森林采伐限额管理有一定的参考价值。