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1、引言 Verhagen等(1963)认为,当光在构成叶丛的叶之间均等分配,叶丛为整体进行光合作用时,其光能利用效率最高。他把这样的叶丛叫做理想叶丛(Idealfoliage)。但后来不少学者常以不同的种或品种作对比试验研究,其得出的结沦则是不同种或品种的生产力。对叶丛功能等方面的研究并没有什么进展。吴增志等人以日本扁柏中龄林为研究对象,用光合作用法和重量法,对林地相对照度为3—5％的林分进行间伐试验研究,证明了林分存在着合理密度(或最适密度),用了相对光合作用时数的概念,建立了数学模型,提出了合理密
1. Introduction Verhagen et al. (1963) argue that when light is equally distributed among the leaves that make up the leaf bundle and the leaf bundle as a whole performs photosynthesis, its light use efficiency is the highest. He calls such a foliage an Idealfoliage. However, many scholars later often used different species or varieties for comparative experimental research, which concluded that the reduction is the productivity of different species or varieties. There has been no progress in the study of leaf plumbing. Wu Zengzhi et al. Studied the middle-aged Japanese Cypress forests with photosynthesis method and gravimetric method, and conducted the thinning experiment on the relative illumination of 3-5% of the forestland. It was proved that there is a reasonable density Density), using the concept of relative photosynthesis hours, established a mathematical model, put forward a reasonable density