【摘要】 按编制林分密度管理图的要求,调查收集了234份油松林标准地资料,编制出山西太岳林区油松林分密度管理图.制图资料分布较好,各树高级林分密度系列较长;高密度林分较多,能较正确地反映油松林分密度效应.图中主要密度效应曲线(等树高线)的数学模型,选用能较好反映林分密度效应的倒数式.本图最大密度线方程由等树高线方程导出,其斜率为-0.594 32,和太岳等林区油松林生长过程表1.0疏密度线的斜率基本一致,是等疏密度线,实用性强.最大密度线位置适当,几乎能覆盖全部油松林分,应用范围较广.本图自然稀疏线方程采用只木式,但根据油松林自然稀疏的情况将其平移,改为从基线开始,可提高预估效果.经检验,该图精度达85%以上.本文详细介绍了密度管理图使用方法.用本图设计间伐与主伐经营方案,预估林分产量和生长量,分析确定合理的造林和营林密度的结果,与间伐试验等研究成果的有关结论基本一致.该图可在当地及同类林区推广应用.更多还原

【Abstract】 Construction of the density control diagram was based on 234 sample plots of a Pinus tabulaeformis plantation in Taiyue forest region, Shanxi province. These plots are widely distributed in the area, and many of them are permanent plots. The main characteristics of the diagram are as follows. The series of density values are comparatively long in each tree height class, in fact, more plots represented were of high densities, thus the effects of density on plantation may be better shown. The reciprocal equation of the yield-density effect was selected as the model of equivalent height curve. Full density curve equation of the diagram presented is derived from equivalent height curve equation. The slope (-0.594 32) of the full-density curve conforms to the normal stocking line of normal yield table for Pinus tabulaeformis stand in this region and nearby areas. It shows that it is an equivalent stocking line to be of better value in practice. The position of this curve is appropriate to be used for covering nearly all stands of Pinus tabulaeformis plantations. The base line of this diagram was used as the starting line for plotting the natural thinning curve equation proposed by Tadaki, and this change improved its value for predicating the stand yield and increment. Through field test, the precision of this diagram is over 85%. This diagram has been used in various forestry practices and has been proved of good effects. It can be widely applied in similar local areas.更多还原