林业调查设计是林业局一项重要的基础工作。它是组织生产、编制生产计划和下达直接生产成本的依据。而伐区立木蓄积和株数的调查则是调查设计中的重要因子。前几年,我局一些林场和有关职能科室普遍反映,我们设计队调查的伐区出材量不准,因此也影响了局木材生产的正常进行。为了提高调查设计精度,适应木材生产的需要,做到伐区设计合理,出材量和伐区成本符合实际。我们曾参阅了有关抽样的一些论文和书刊,结合我局的资源情况自行规定:“对原始林及次生杨桦林抽样面积比不小 Forestry investigation and design is an important basic work of the Forestry Bureau. It is the basis for organizing production, preparing production plans and issuing direct production costs. However, the investigation of stocking and stocking in cutting areas is an important factor in the survey design. A few years ago, some forest farms and relevant functional departments of our bureau generally reflected that the logging area surveyed by our design team was out of material volume and therefore affected the normal timber production. In order to improve the accuracy of survey design and meet the needs of timber production, the design of cutting area should be rational, and the cost of timber and cutting area should be in line with the actual conditions. We have referred to some of the papers and publications on sampling, in accordance with the resources of our bureau: ”The sampling area of ​​primary and secondary birch forests is not small