现代森林调查中,引进了多种多样的数理统计方法。这些方法通过不同的条件、途径来提高抽样估测效率。分层抽样就是通过对所调查林区进行一系列分类来达到缩小变动、提高精度的目的。与此相同,回归估测、比估测和双重抽样则都是利用对林区中某些辅助调查因 Modern forest survey, the introduction of a variety of mathematical statistics. These methods through different conditions, ways to improve the sampling efficiency. Stratified sampling is through a series of classification of the surveyed forest to achieve the purpose of reducing the change and improving accuracy. In the same way, regression estimates, ratio estimates and double sampling are based on the use of some of the supplementary surveys