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森林测定最重要的作业之一就是估计样树材积。以最低的费用，提供准确无偏估计材积的取样方法是很有价值的。有关这方面的革新研究已做了报道。本文对它们进行综评，以图容易理解和实施。１ 圆锥形函数法圆锥形函数法指的是一种抽样方法，即利用树形的预备信息，在一特定群体
One of the most important tasks in forest determination is to estimate sample tree volume. Sampling methods that provide accurate and unbiased estimates of volumes at the lowest cost are valuable. Research on innovation in this area has been reported. This article reviews them comprehensively to make them easy to understand and implement. 1 conical function method Conical function method refers to a sampling method, the use of tree-shaped information in a particular group