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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.
According to the requirement of compiling forest density management map, the survey collected 234 standard data of Pinus tabulaeformis forest and compiled the map of the density management of Pinus tabulaeformis forest in Taiyue forest area of Shanxi Province.The distribution of mapping data is good, and the density of senior tree stands is longer . The higher density stands can more accurately reflect the stand density effect of Pinus tabulaeformis plantation.The mathematical model of the main density effect curve (such as tree height line) in the picture selects the reciprocal formula which can better reflect the stand density effect. The maximum density line equation is derived from the tree height equation and has a slope of -0.594 32, which is basically the same as the slope of the 1.0 density line in the growth process of Pinus tabulaeformis forest in Taiyue. The density line is well positioned to cover almost all Pinus tabulaeformis forest and has a wide range of applications. The natural sparse line equation in this figure uses a wood-only style, but according to the natural sparseness of the Pinus tabulaeformis forest it is translated from baseline to baseline After the test, the accuracy of the figure is above 85% .This paper introduces the use of density management chart in detail.This plan is used to design the management plan of thinning and main cutting, to forecast the yield and growth of stand, to analyze and determine the reasonable afforestation and camp Lin density results , Which is basically consistent with the relevant conclusions of research results such as thinning test.The map can be popularized and applied in local and similar forest areas.