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

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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 (V)
  • ヒノキ人工林における天然生ヒノキ稚樹の個体群動態-5-実生の発育と生存過程
  • 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
  • 実生の発育と生存過程
  • The development and survivorship of seedlings on the various kinds of forest floors

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Abstract

The development and survivorship of hinoki (Chamaecyparis obtusa S. et Z.) seedlings emerging on undisturbed and soil-disturbed floors under different degrees of canopy openings and on an open area were investigated in 1978, 1979, and 1980. Almost all of the seedlings where the relative light intensity (RLI) was more than 11.5% developed into the stage having scaly (real) leaves, whereas almost all seedlings at 2.9% RLI did not reach this stage within the emerging year. Survival rates of seedlings were lower in the summer than in the winter. They were lowest in the current seedlings. Survival rates of current seedlings were higher at 1050% RLI than where the RLI was below 10% or above 50%. Soil-disturbance did not have any major effects on the current seedling survivorship at 10-50% of RLI. However, where the RLI was below 10% or above 50%, the survival rates of current seedlings were lower on soil-disturbed floors than on undisturbed floors.

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