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规定火烧和造林往往需要测定半腐层深度。本文介绍一种实用的均质半腐层深度测定方法,并给出典型管理情况的样本计算方法。经研究证明,同质林分中半腐层深度的均差是常数。因此,可采取小块地抽样法估计整片林地半腐层的平均深度。调查程序和计算方法如果调查区的林分密度、树种组成和年令分布比较一致,该区便可作为一个抽样单元,如果存在某些差异,则需要勾画出最大的边界,每个确认的分区还可再重新划分。划分抽样区时,要避免诸如公路、集材道、装车场之类因子的干扰。
Provisions of fire and afforestation often require the determination of the depth of half-coat. This paper presents a practical method of determining the depth of homogeneous half-coat and gives a sample calculation method for typical management. The research proves that the mean difference of the depth of half-coat in the homogeneous forest is a constant. Therefore, a small sampling method can be used to estimate the average depth of the entire forest half-layer. Investigation procedure and calculation method If the survey area has a relatively uniform forest stand density, tree species composition and year-to-year distribution, the area can be used as a sampling unit. If there are some discrepancies, the largest boundary needs to be outlined. Each confirmed partition Can also be re-divided. Divide the sampling area, to avoid such factors as road, timber road, loading yard interference.