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本文在对间伐和风害之间关系的讨论和以往有关研究结果的基础上,确定了一种林木风害危险率的估计方法,用于评价间伐对林木风害的影响。这种对单株黑松及整个黑松林分的风害危险率估计,是根据风速廓线、枝条分布和透光分层疏透度(OSP)系数推导出来的。结果表明:如果枝条分布模型中的参数β等于单株树冠中风速廓线模型的衰减系数αs,参数H/D1.33可用于比较和评价对单株树木的风害危险率。这一原理也同样适用于整个林分,即用林分内风速廓线衰减系数α和透光分层疏透度(OSP)的分布中的衰减系数ν,结合D1.33估计和比较林分风害危险率。文中对间伐与非间伐单株黑松风害危险率进行了估计,得出了间伐两年后可以降低单株黑松风害危险率的结论;同时给出了确定林分风害危险率估计的过程图。图3参45。
Based on the discussion of the relationship between thinning and wind damage and the related research results in the past, this paper determined a method of estimating the risk of wind damage to trees to evaluate the effect of thinning on forest wind damage. This risk estimate for wind damage to individual Pinus thunbergii and Pinus thunbergii stands is derived from wind profile, shoot distribution, and translucent layering permeability (OSP) coefficients. The results show that the parameter H / D1.33 can be used to compare and evaluate the risk of wind damage to single trees if the parameter β in the model of branch distribution is equal to the attenuation coefficient αs of the model of the single canopy stroke profile. This principle also applies to the entire stand, ie, using the attenuation coefficient ν in the attenuation profile α of the wind speed profile and the distribution of OSP (OSP) in windbreak, in conjunction with D1.33 to estimate and compare stands Wind hazard risk. In this paper, the risk of wind damage of thinning and non-thinning of single plant was estimated, and the conclusion was reached that the risk of wind damage could be reduced after two years of thinning. At the same time, Process diagram. Figure 3 reference 45.