我国在60年代曾根据大量伐倒木实际造材资料,采用材积比值法,即以单株总材积为100%,求出经济材及各材种的百分比。然后,分别材种图解,经反复调整、修匀,编制成“材种数表”,作为预估商品材及各材种出材率的依据。这一时期编制的材种数表,未能被生产广泛应用。究其主要原因,一是表中所列材种品种及其出材率系根据既定材种顺序确 In the 1960s, China used the volume-ratio method based on a large number of actual timber cutting materials, that is, the percentage of economic timber and timber species was calculated by taking the total volume of the single plant as 100%. Then, respectively, timber species diagram, after repeated adjustments, smooth, compiled into “timber species table,” as a prediction of commodity timber and timber species based on the rate of timber. The number of species tables compiled during this period failed to be widely used in production. The main reason, one is listed in the table species species and the rate of timber according to the order of established species indeed