富士山におけるイタドリの芽生えの定着

概要

論文の詳細を見る
Polygonum cuspidatum is one of the pioneer perennials in the early stage of the voicanic desert succession on Mt. Fuji. The fate of P. cuspidatum seedlings was pursued during the growing season of 1973. Germination occurred twice, discretely, first early in May and second in the rainy season (Baiu) of June. Some of the seedlings which germinated in early May survived throughout the growing season. On the other hand, nearly all the seedlings that germinated in the middle of June died during the nine consecutive rainless days in summer. At the onset of the drought there was a large difference in the root development between the two groups of seedlings. From the study of the drying process of the gravelly soil layers, it was deduced that the water content of the upper part of the soil (0-5 cm) had dropped to a very low level by the end of this short drought period. It was surmised, therefore, that the seedlings with shsllower roots could not absorb sufficient water and died.
日本生態学会の論文
1976-06-30