一、面积评定的必要性抽样总体森林面积精度的讦定是当前我省二类调查中被忽视的一个重大问题。众所周知,在一个总体中,森林资源估测得正确与否取决于二个主要因素,一是总体的蓄积平均数,一是森林面积。这二个因素中无论那一个出现偏差都会降低估测精度。但是在以往的生产实践中,只是对总体的蓄积精度作 I. The Necessity of Area Assessment Sampling of overall forest area accuracy is a major issue that has been overlooked in the current survey of the second type in our province. As we all know, in a whole, the forest resources are estimated correctly or not depends on two main factors, one is the overall average of the accumulation, the first is the forest area. Deviations from either of these two factors reduce the accuracy of the estimation. However, in the past production practice, only the overall accuracy of the accumulation