Studies on theAbies population of Mt. Shimagare II. Reproductive and life history traits

  • Takashi Kohyama
Article

Abstract

Reproductive traits are clarified for subalpine wave-regeneratedAbies populations in Central Japan, by observations at and near Mt. Shimagare, and by analyzing data from Mt. Asahi. Only dominant trees produce seeds. They begin to reproduce at 50 years in age. Seeding interval is about 4 years. Averaged seed number produced by an adult tree per annum does not change with tree age. Since production rate of an adult tree increases with age, annual reproductive effort decreases with age. For a successfulAbies veitchii tree, lifetime net reproductive effort is 3.7% to seed cones and 0.93% to seeds. It produces 2.6×105 seeds in its life. As the mortality is very low for adult trees, a constant rate of seed fall per unit area is expected over a long period. Only some 0.1% of falling seeds become current-year seedlings. In theAbies population, regenerative opportunity combined with the collapse of mature stands is limited and unpredictable. This regenerative feature is the major driving force promoting observed reproductive traits and high juvenile mortality of this forest tree population in a steady-state.

Key words

Abies forest Fecundity schedule Life history Mast years Reproductive effort Wave regeneration 

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Copyright information

© The Botanical Society of Japan 1982

Authors and Affiliations

  • Takashi Kohyama
    • 1
  1. 1.Laboratory for Plant Ecological Studies, Faculty of ScienceKyoto UniversityKyoto

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