北海道演習林カラマツ幼令林の樹高成長推移と被害状況について : 予報

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This is a report of the survey of the height growth and. damages of the young larch stand in the Hokkaido Instruction Forest attached to Kyushu University, Department of Agriculture, that was carrid out over three days from July 17 through 19, 1955. Information is still lacking and. it is dangerous to draw a conclusion from the data of this survey that was made at a time point and is not in a time sequence, but the following provisional conclusion may be drawn from the present study. 1) The normal trees show a good linear height growth up to the measuring time point. The estimated height of normal, trees in 10 years after planting is 250 cm - 300 cm, and it is expected that the growth will be ranked about the middle between the 2nd class and the 3 rd class plots in the yield table for larch forest in Karukawa District in Hokkaido, 2) The standard deviation and the coefficient of variance of the height of normal trees are linearly related with the age of the forest, $ \sigma $ being 60 cm and C. V. 35 -40 % approximately at 5 years of forest age. 3) The height growth of damaged trees are considerably inferior to that of normal trees. 4) Especially, the height growth is retarded markedly in sickle-damaged trees. 5) Among various kinds of damages, dead trees due to wood-mice damage show the highest damage rate. 6) The height growth after the trees are damaged seems to depend on the location and the time of damage. The general conclusion on the height growth and damages of young larch forest will be drawn after the permanent plot is established in the future.I 緒論　II 調査地の概況　III 調査方法　IV 調査結果及び考察　V　総括　Resume
九州大学の論文

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椎葉俶嗣
九州大学農学部

北海道演習林カラマツ幼令林の樹高成長推移と被害状況について : 予報

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