一、前言在森林资源三类调查的伐区调查中,必须提供伐区小班出材量的数据。一般采用的方法是对伐区小班全部面积或设置样地进行每木检尺(每木测径和测定全部或部分林木的树高),从一元或二元材积表查定各径阶的材积,用出材率表或材种表查算材种出材量。这种做法的工作量是繁重的,当伐区面 I. Foreword In the investigation of the cutting of three categories of forest resources, it is necessary to provide the data on the output of small classes in the cutting area. The commonly used method is to cut the area of ​​the small area of ​​the whole area or set the sample for each wooden ruler (per wood measuring and measuring all or part of the tree height) from one yuan or two yuan volume table to ascertain the volume of each diameter , With the timber rate table or timber species timber calculation of timber production. The workload of this approach is heavy and should be cut