島根大学理学部紀要

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島根大学理学部紀要 23
1989-12-25 発行

地形に関連したアカマツ個体群における分散構造の解析

Analysis of Dispersion Structure in Japanese Red Pine Populations with Reference to Topography
宮田 逸夫
ファイル
内容記述(抄録等)
Dispersion structure with reference to topography was analyzed by Iδ-method in the natural populations of Japanese red pine (Pinus densiflora S[IEB]. & Zucc.). Most of stands less than 10 years old on the bank-slopes along a sunny road exhibited the aggregated distribution , regardless of the inclination and the direction of slopes. This contagiousness was seemed to closely relate with micro-topography of the stands and behavior of seeds with wings after landing onto the ground. All the stands more than 10 years old denoted even-spacing. The change of pattern from the aggregated distribution to the uniform suggested that mortality process operates density-dependently in local among trees. From the standpoint of dispersion structure , there was suggested a possibility of predicting the exact time when self-thinning would start.