一、绪言关于树木的营养生长以及与其有关的生态现象(休眠、落叶、生长期间等)对于日照长度反应(光周性)的研究,到目前为止被研究的树种约有60属、110种以上。可是,就我国生长着的树种来说,以日本赤松,黑松、落叶松、柳杉、扁柏以及琉球松等针叶树为对象的研究报告占其大半,而阔叶树则比较少,关于药师寺等人的报告不过是最近的事情而已。 I. INTRODUCTION Studies on the vegetative growth of trees and their associated ecological phenomena (dormancy, deciduous foliage, growth period, etc.) have shown that there are about 60 genera and 110 species of trees studied so far for their responses to photoperiod (photoperiod) . However, studies on coniferous trees such as Japanese red pine, black pine, larch, cedar, cypress and Ryukyu pine account for most of the tree species that grow in our country, while broadleaf trees are relatively rare. Regarding Yakushiji and others The report is but the most recent thing.