摘要
本文以日本扁柏人工林为研究对象,通过对间伐林分和不间伐林分的生产结构、光能分布、光合速率、枝叶生长等季节变化的观测,进而计算了光能利用效率的季节变化。通过比较研究,证明了生产结构影响光能利用效率,而密度影响群落生产结构。合理的生产结构可以使光能在群落内合理分配、各层叶的光合潜力充分发挥、提高群落的光能利用效率。为了标定林分生产结构的合理性,本文提出了相对光合时间数和相对光能利用率的概念及数学公式。绘制了生产结构与功能图。对合理的生产结构与合理密度的关系进行了论述。
Using a Chamaecyparis obtusa plantation as an objict of investigation, we calculated the seasonal changes of solar energy utilization ratio by measuring the seasonal changes in the productive structure, solar energy distribution, the rate of photosynthesis and the growth of branches and leaves in thinned and unthinned stands, Through comparative studies we found that the productive structure affects solar energy utilization ratio and the density influences the productive structure of a community. A rational productive structure can result in the reasonable distribution of solar energy, make the leaves at the different storeys develop their photosynthesis potential full and increase the solar energy utilization ratio of the community. We suggested the concepts of relative photosynthesis hours and relative solar energy utilization ratio and gave their formulas as well for determining whether the productive structure of a stand is good. We also gave the graph of productive structure and its ruction. The relationship between rational productive structure and rational density was also discussed.
关键词
扁柏人工林
光能利用率
光能分配
Chamaecyparis obtusa plantation
Productive structure
Solar energy utilization
