Growth of Tree Species in a Broadleaved Secondary Forest as Related to the Light Environments of Crowns

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  • 二次林の樹種の成長と樹冠の光環境
  • 2次林の樹種の成長と樹冠の光環境〔英文〕
  • 2ジリン ノ ジュシュ ノ セイチョウ ト ジュカン ノ ヒカリ カンキョウ

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Abstract

The total volume of crowns, their light environment, growth rate of total basal area, and their interrelationships were investigated for each tree species in a secondary forest of mixed-species composed of a few superimposed leaf-layers. Values of relative illuminance (RI) varied spatially in forest profiles. The RI value between the first (that is, the highest) leaf-layer and the second (lower) leaf-layer was about 10%. According to the RI values to which their crowns mainly belonged, species were grouped into two categories ; namely, the sunlit species, whose crowns occurred in the region of RI_??_10%, and the shaded species, whose crowns belonged to the region of RI<10%. For the trees of each species, total basal area, sum of (DBH)2×(tree height), and growth rate of the total basal area strongly correlated with their total crown volumes. However, specific relationships were different between the sunlit and the shaded species; namely, the growth rates of the total basal areas of the sunlit species were greater than those of the shaded species for given crown volumes. Therefore, for each species, the basal area growth rate was related to both the volume and the RI conditions of the crowns. Some aspects regarding the role of the light environment of the crowns in tree growth are discussed.

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