Leaf Life Spans in Genus Pinus

JASI HANDLE Web Site Open Access

Bibliographic Information

Other Title
  • マツ属の葉の寿命
  • マツゾク ノ ハ ノ ジュミョウ

Search this article

Abstract

In relation to speciation in the genus Pinus, leaf life span of 46 pine species and mean maximum leaf age in 60 species was examined, which had been planted under natunal condition at Kyoto. The leaf life spans were calculated from the monthly data of leaf fall rate as reported in the former study. The maximum leaf ages at the lower branch were measured in winter and shown in Table 1. The leaf ages or leaf life spans of pines are low to compare those of evergreen coniferous species. Although leaf ages are largely different among pine species from 1.2 to 3.5 years, the values had fundamentally no relation to the gradient of environmental conditions such as Mean Warmth Index or mean latitude at their native habitat as shown in Figs. 3 and 4. The difference in age of the species seemed to relate to the pine groups of taxonomy as the sample of Subsect. Gerardianae. On the other hand, the large difference of them appeared among pine groups of Subsect. Sylvestres or Subsect. Oocarpae. Many species of long life span are pines to have old features in the form of corns. Pines in old era are considered to be long life span. Present pines of short life span seemed to be formed by differentiation from the pines of long life span.

Journal

Details 詳細情報について

Report a problem

Back to top