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蓄积量通过样地每木调查,用一元材积表测算,是目前我国和其它国家最常用的一种调查方法。随着经营强度和调查技术的提高,越来越对一元材积表测算蓄积量提出了疑异或否定。若用二元材积表,虽能提高样地蓄积量的调查精度,但需要测定三四十株立木的树高来反映待测样地胸径与树高的数量关系,使外业工作量增加很多,因之未广泛采用。本文根据3P 抽样理论,提出在样地每木调查基础上,增测少量立木高,能有效地提高样地蓄积量调查的精度,为区别于常规样地调查法,我们称之为“样地蓄积量调查的3P 抽样法”
The accumulation of volume through the plots per wood survey, measured with a single volume table, is currently China and other countries, the most commonly used method of investigation. With the increase of operating intensity and investigation techniques, more and more doubts or negatives have been put forward on the measurement of the accumulation volume of one-dollar volumetric tables. If using binary volume table, although can improve the accuracy of plot accumulation, but the need to determine the height of thirty or forty standing tree height to reflect the measured sample diameter and tree height relationship, so that the workload of the field increased a lot , Which is not widely used. Based on the 3P sampling theory, this paper proposes that based on the survey of every plot, increasing the height of a small number of standing trees can effectively improve the accuracy of survey of plot accumulation. To distinguish it from the conventional plot survey method, we call it “sample plot 3P sampling method for stock volume survey ”