Community dynamics of young stands of <i>Chamaecyparis obtusa</i> for five years after clear-cutting

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  • -ヒノキ幼齢造林地の群落とその遷移-伐採後5年間の経過-
  • ヒノキ ヨウレイ ゾウリンチ ノ グンラクト ソノ センイ バッサイゴ 5ネン

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Abstract

Permanent quadrats were set up on a slope in the forest of Tokyo University in southern Chiba Prefecture to study the community dynamics in a young stand of Chamaecyparis obtusa for five years after clear-cutting. The floristic compositions, life-form spectra, degrees of succession, etc. were investigated and compared on one to five year stands of the plantation, and diagnosis of the conditions and trends was applied to early stages of the stands. The successional sequence after clear-cutting is rather different from a normal and regular sequence of secondary succession in denuded quadrats in an experimental field which NUMATA and his collaborators studied for a long time. DS of upper is higher than that of lower sites, and DS in five year stands is somewhat lower than that in one year stands. Such a phenomenon is not found in normal denudation experiments, but it is a characteristic of secondary succession after clear-cutting. It may be caused by the remaining stumps of trees, brush cutting, etc. There are two formulae to calculate DS, including the usage or non-usage of climax adaptation number (1_??_5). The absolute figures are different, of course, between the two, however the tendencies are quite similar. Therefore, the simpler formula of DS which does not include the climax adaptation number can be used even for forest stands.

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