摘要
选择不同林分类型和立地条件,按不同经营密度分别设立固定标准地,开展立地类型划分和最适密度选择。同时,在固定标准地内,对林分生长性状、形质指标、干物质积累量、枯枝落叶分解量及养分归还量进行连续定位观测。结果表明:经营密度对林分生长、干物质积累和枯枝落叶分解影响较大,且以中等经营密度(0.7)效果最理想。在立地类型划分、最适经营密度选择、密度效应分析、径级-株数分布规律研究的基础上,针对不同培育目标,分别提出不同立地条件下天然杨桦(胶合板材、普通建筑材、纸浆材)用材林高效经营技术,为科学经营存量种质资源,最大限度提高森林生产力奠定理论基础。
Fixed sample plots were set up respectively with different management densities under different stand types and site conditions for classifying site types and selecting the optimal density. The forest growth traits, morphological indexes, dry matter accumulation, litter decomposition and nutrient concentration were observed continuously in the fixed sample plots. The results showed that the cultivation density has a close relationship with the forest growth, dry matter accumulation and litter decomposition, and the 0.7 cultivation density had the best results. Efficient management techniques for natural Poplar-Birch timber forests were proposed according to different site conditions and different cultivation objectives （veneer, common construction timber, pulpwood） based on the site type classification, optimal density selection, density effect analysis and distribution patterns of DBH class-tree number. It was intended to provide some basic guidelines for scientific management of stock germplasm resources and optimal improvement in forest productivity
出处
《安徽林业科技》
2011年第3期3-9,共7页
Anhui Forestry Science and Technology
基金
黑龙江省重大科技攻关项目"速生树种用材林高效经营技术与示范"(编号:GA07B301-07)
关键词
杨桦林
立地分类
经营密度
密度效应
高效经营
Poplar-Birch forests
Site classification
Cultivation density
Density effect
Efficient management
