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本文以日本扁柏人工林的中龄林为研究对象,通过追踪间伐林分和不间伐林分的光合速率、光能分布、枝叶生长等季节变化,进而计算了光能利用率的季节变化。通过对两林分的比较研究,证明了合理密度的存在;指出了在合理密度下,林分的生产构造可以使光能在林内合理分配、使各层叶片光合潜力充分发挥,提高林分光能利用率。为了标定林分生产构造的合理性,本文提出了相对光合时数和相对光能利用率的概念及数学公式。在佐伯的生产构造图的基础上,提出了生产构造与功能图,揭示了合理密度的增产效益。本文还对合理密度的理论根据及其应用进行了论述。
In this paper, the secondary aged forest of Japanese cypress plantation was taken as the research object. By tracking the seasonal changes of photosynthesis rate, light energy distribution, growth of leaves and branches, the season change of light energy utilization rate was calculated. Through the comparative study of the two stands, the existence of reasonable density was proved. It was pointed out that the production structure of the stand could reasonably distribute the light energy in the forest under the rational density, and make the photosynthetic potential of all layers give full play to improve the light energy Utilization rate. In order to calibrate the rationality of stand production structure, this paper presents the concepts and mathematical formulas of relative photosynthesis and relative light energy utilization. Based on the production structure of Saiki, the production structure and function chart are put forward, which reveal the yield increase of reasonable density. This paper also discusses the theoretical basis of reasonable density and its application.