一、引言日本扁柏(Chamaecyparis obtusa S、etZ、)是日本的重要经济树种之一(SHID EI等,1974)。虽然已经对森林的干物质生产量进行了相当多的研究,但是,对日本扁柏初级生产量的研究却寥寥无几。本文打算提出一种有关胸径(DBH)的频率分布和生物量的呼吸消耗量或单株林木的胸径生长量方面的 I. Introduction Chamaecyparis obtusa S, et Z, is one of Japan’s major economic species (SHID EI et al., 1974). Although considerable research has been conducted on the dry matter production of forests, there have been only few studies on the primary production of Japanese cypress. This article intends to propose a study on the frequency distribution and biomass consumption or the DBH growth of individual DBH