Promoting old-growth characteristics and long-term wood production in Douglas-fir forests     

R. T. Busing  S. L. Garman 《Forest Ecology and Management》2002,160(1-3):161-175

Trade-offs among wood production, wood quality and ecological characteristics in the management of harvested forest stands are explored through model simulation of various silvicultural regimes. Long-term production of merchantable wood, production of various types of high-quality wood, and the level of certain quantitative ecological indicators are projected for coniferous forests of Pacific Northwestern USA. The set of ecological indicators used is based on the species composition and physical structure of old, unlogged forest stands. Simulations are performed with an ecological model of forest stand dynamics that tracks the fate of live and dead trees. Short rotations (<50 years) produce the least amount of high-quality wood over the multi-century simulation period. They also fail to generate ecological attributes resembling those of old forest stands. Production of high-quality wood is moderate to high under all rotations of 80 years or more; however, most ecological indicators require longer rotations unless alternatives to clearcutting are applied. Alternatives examined include retention of 15% cover of live tree canopy at each harvest in combination with artificial thinning between harvests. Thinning from below can expedite the development of large live and dead trees, and canopy height diversity without greatly diminishing wood quantity or quality. Proportional thinning retains understory stems, thereby expediting the recruitment of shade-tolerant trees. A possible drawback to thinning, particularly proportional thinning, is the diminished production of clean-bole wood at rotations of 150 and 260 years. It is concluded that most wood quantity, wood quality and ecological objectives can be met with long rotations (ca. 260 years). Certain objectives can be met with shorter rotations (80–150 years) when treatments of thinning and canopy tree retention are applied.  相似文献   

从生态园林城市可持续发展看我省城市创建思路     

张剑 《贵州林业科技》2006,34(1):44-47

用可持续发展观对建设生态园林城市工作进行分析,探讨我省创建园林城市和生态园林城市的思路和方法。  相似文献   

常绿阔叶林的可持续经营     

詹有生  钱卫民 《江西林业科技》2005,(3):11-14,18

通过对常绿阔叶林研究，努力探索一条发展常绿阔叶林的途径。将阔叶林划分为3个经营类型，分别为：初期幼龄林组成抚育类型、中期幼龄林抚育间伐类型、中龄林密度管理类型。并提出小面积皆伐的采伐方式。同时对常绿阔叶林的生态功能和生产力进行初步研究。  相似文献   

贵州喀斯特山区农村庭园生态经济发展途径与对策探讨   总被引：1，自引：0，他引：1  

梅再美 《贵州林业科技》2005,33(3):45-48

本文从分析贵州喀斯特山区农村存在的主要生态经济问题出发,论述了贵州喀斯特山区农村庭园生态经济发展的内涵与目标,提出了发展贵州喀斯特山区农村庭园生态经济的途径与对策.  相似文献   

牙克石市水土保持生态修复的途径研究     

孙殿芝 《内蒙古林业调查设计》2007,30(2):15-16

文章在分析牙克石市自然条件及水土流失特点的基础上,提出牙克石市水土保持生态修复的可行性及生态修复的措施,以及近年来牙克石市生态修复所取得的可喜成果。  相似文献   

金沙江干热河谷生态问题与退耕还林技术模式的研究   总被引：5，自引：0，他引：5  

杨再强  谢以萍 《四川林勘设计》2003,(4):28-33

通过对金沙江干热河谷生态环境和经营条件分析，提出适合金沙江流域不同海拔和立地条件的退耕还林的技术模式，论述了经济林模式、生态林模式、用材林模式和林草混交立体模式的适用立地条件、造林树种、经营技术及经济效益。  相似文献   

Predicting equations of main factors affecting regional climate in the "Three-North" Protective Forest Area     

张志秀  刘鹏  杨德威 《林业研究》1999,(1)

lntroductionInordertosolvetheseriousecologicaIproblemwefacedandimprovethephenomenonoflanddesertifi-cationinthenorthareaofChina.ChinahasbeguntoconstructtheThree-NorthProtectiveForestSystemsince1978.Withthehardworkoftwentyyears,itistold"Thegreatestecologicalprojectoftheworld"and"ThegreengreatwaIl".AIthoughthecountryinvestedIotsofcapitaItobuiIdtheThree-Northshelter-forestsystemthroughmanywayssuchasThree-Northspecialinvestment,financeappropriatefunds,finan-cialloansandtakeoutfundsforbringup…  相似文献   

21世纪毛竹林生态经营战略   总被引：5，自引：0，他引：5  

郑郁善 《竹子研究汇刊》2001,20(3):15-19

本文针对当前毛竹经营特点与经营现状，提出了21世纪毛竹经营应实施生态经营，这样不权可以获得最高的竹林经济效益和社会效益，也能发挥最大的效益。  相似文献   

林区可持续发展的战略研究     

王华章 《森林工程》2001,17(6):10-11

通过对林区生态和环境资源的经济化运作，林区经济结构及运行机制，林区人口等问题的论述，提出应将林区可持续发展做为系统场的运行来研究，以实现林区真正的可持续发展。  相似文献   

在"生态县"建设背景下的修水林业发展对策探讨     

余于文 《江西林业科技》2007,(4):49-52

简要回顾修水县林业发展历史的基础上,从"生态县"建设的视角下,审视和剖析目前制约修水林业发展的突出问题,提出修水林业建设与发展的8点建议和具体实施办法。  相似文献