葉の生存戦略 : 森林樹木を中心として

概要

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Existing literature on seasonal replacement in forest tree-leaves was reviewed from the viewpoints of phenology, leaf biomass, leaf fall, leaf survivorship-curves and defoliation by insects. Many of the investigations which had focused on phenological and leaf fall analyses were found to be inadequate to obtain accurate information about the life span of individual leaves. Life table analysis of leaves should be introduced into this type of investigation in order to construct an economic life table from a combination of life-tables with photosynthetic or respiratory activities. Leaf longevity is considered to be determined by the balancing of the cost of leaf construction, leaf maintenance, and the benefit or photosynthetic gain from the leaves. Therefore, leaf longevity is one adaptive strategy of plants to environmental conditions. The leaf survival strategy of pioneer species is characterized by long term leaf-emergence and short leaf-longevity, whereas tree species which are members of climax forests show simultaneous leaf-emergence and leaf-fall. Leaf longevity of forest-understory species is usually long. Leaf survival strategies are considered to have resulted from the evolutionary adaptive radiation of each species to various environments, accompanied by the evolution of morphological features such as shoot structure.
日本生態学会の論文
1986-12-31