The population dynamics of naturally regenerated hinoki seedlings in artificial hinoki stands (VII)

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  • ヒノキ人工林における天然生ヒノキ稚樹の個体群動態 (VII)
  • ヒノキ人工林における天然生ヒノキ稚樹の個体群動態-7-実生の初期生長
  • ヒノキ ジンコウリン ニ オケル テンネンセイ ヒノキ チジュ ノ コタイグン
  • 実生の初期生長
  • Initial growth of seedlings

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Abstract

Initial growth of hinoki (Chamaecyparis obtusa S. et Z.) seedlings that emerged in 1978, 1979, and 1980 on undisturbed and soil-disturbed forest floors under different degrees of canopy openings and on an open area were investigated in November, 1980. Longevity of cotyledons and first leaves were the longest on the floor having 2-4% RLI (relative light intensity). The number of scaly leaves, size (height, diameter at base, and root length) of seedlings, and dry weight of the total and the parts (leaves, branches, and roots) of seedlings were appreciably greater for the seedlings receiving more than 8% RLI than the seedlings receiving 2-4% RLI. Soil-disturbance did not affect significantly these values except for the seedlings at 20-50% RLI, which were the largest seedlings. The top-root ratio (T/R) of seedlings decreased with increased RLI. It was the smallest on the soil-disturbed floor with 20-50% RLI. These results suggest that the soildisturbed floor with 20-50% RLI is the most favorable for the growth of seedlings under field conditions.

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