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用3P样本计算总体平均生长量的方法 当前调查和预估森林生长量的技术方法很多,有“连查”固定样地长期观测法,有用解析木或建立固定标准地观测法,有用生长过程表或采用分类一元材积生长量(率)表等。这些方法在不同程度上均需花费大量的力量进行内外业工作。在生产上应当根据森林经营强度和调查目的的不同,研究不同形式的调查和预估森林生长量的方法。 本试验是采用类型中心抽样和3P抽样法相结合的调查方法,在探讨类型平均蓄积量估测总体蓄积量的同时,对材积生长率的测定方法及对总体生长量进行预估也作了初步探索。 一、资料的收集
Methods for Calculating the Total Average Growth Using 3P Samples There are many techniques currently available for investigating and estimating forest growth. There are many methods for long-term observation of “fixed-point” plots, useful analytical trees, or establishment of fixed-standard observational methods, useful growth process tables Or the use of classification of a single volume growth rate (rate) table. To varying degrees, these methods need to spend a lot of power on the job. In production, different methods of investigating and estimating forest growth should be studied according to the intensity of forest management and the purpose of the survey. In this study, we used the method of type center sampling and 3P sampling to investigate the method of measuring the total volume of type accumulation and the method of measuring the volume growth rate and the estimation of the total growth. . First, the collection of information