Internet网络与林业文献信息资源共享初探

本文简介了Internet网络及其功能，并对该网络对文献信息资源的影响以及实现林业文献信息资源与Internet网络共建共享进行初步探讨。     

谈清河林业局商品林基地建设

作者依据清河林业局的自然条件和交通、种苗基地及技术力量等实际情况,论述了在清河林业局建设商品林基地的可行性.     

对抓好营林生产管理工作的几点认识

从4个方面论述了亚布力林业局营林生产管理工作的有效措施。     

我国现代林业建设的思考

从引入现代林业的概念着手,结合我国的国情和林情,分析了现代林业的特点,提出了建设现代林业的指导思想和有关问题的建议。     

Logging pattern and landscape changes over the last century at the boreal and deciduous forest transition in Eastern Canada

Forestry practices associated with the industrial era (since ~1900) have altered the natural disturbance regimes and greatly impacted the world’s forests. We quantified twentieth century logging patterns and regional scale consequences in three sub-boreal forest landscapes of Eastern Canada (117,000, 49,400 and 92,300 ha), comparing forestry maps depicting age and forest cover types for early industrial (1930) and present-day (2000) conditions. Results were similar for the three landscapes, indicating large-scale forest change during the twentieth century. In 1930, previous logging activities had been concentrated in the lowlands and along the main hydrographical network, as compared to a more even distribution over the landscapes in 2000, reflecting a decreasing influence of the environmental constraints on forest harvesting. In 1930, old-aged forests (>100 years) accounted for more than 75% of the unlogged areas of the three landscapes, as compared to less than 15% for the present-day conditions. Logging practices have thus inverted the stand age distribution of the landscapes that are currently dominated by young and regenerating stands. The 1930 forest cover types showed a clear relationship with elevation, with conifers located in the lowlands and mixed and deciduous stands restricted to the upper slopes. Between 1930 and 2000, 58–64% of the conifer areas transformed to mixed and deciduous forests, such that no clear altitudinal relationships remained in 2000. We conclude that twentieth century logging practices have strongly altered the preindustrial vegetation patterns in our study area, to the point that ecosystem-based management strategies should be developed to restore conifer dominance, altitudinal gradients, as well as the irregular structure inspired from old forest stands.     

21世纪平原林业发展之路

以江汉平原的林业生产为背景，分析了平原林业的现状、客现条件和主观要求，对未来平原林业的发展进行了有益的探索，提出了２１世纪平原林业的发展之路。     

山东省高速公路绿化植物配置研究

以《公路环境保护设计规范》等行业规范为设计依据，根据山东省植物分区和山东省林业区划将山东省高速公路绿化植物资源划分为四个区域，通过对区域内主要高速公路绿化的植物和配置形式进行调查、对比、分析、评价，总结出目前山东省内不同立地条件和不同区域内，高速公路绿化的主要植物品种及较好的配置形式。本文最后对我省目前高速公路绿化在植物选择和配置形式方面提出部分问题和建议。     

两种常见林地有偿使用方式对森林经营的影响分析

以福建南平一般杉木中指数中径材经营类型生长指标结合现行市场有关技术经济指标,对林地拍卖与逐年支付地租两种常见林地有偿使用方式对森林资源资产经营的影响进行分析,为林地经营权所有者与林地使用者进行森林资源资产经营提供借鉴。     

未观测林业经济及其成因分析

对未观测林业经济活动进行了界定,并将其分为非法的林业经济、未申报的林业经济和未统计的林业经济3类.未观测林业经济产生的原因有林业法律政策的约束性和滞后性;林业的行业特点加大了林业执法与监管的难度和林业经济统计的难度;部分林业行业管理制度的严苛条件直接导致了统计瞒报现象的产生、林产品市场差价.     

赤眼蜂在林业上的应用

赤眼蜂属是分布广泛的昆虫卵寄生蜂，三十年来吉林省坚持应用赤眼蜂防治落叶松毛虫，分月扇舟蛾等，防治效果在60％～70％。本文介绍了吉林省分布的9种赤眼蜂和18种常见林木害虫寄生的赤眼蜂种型。