九州大学早良演習林の林分構成ならびに成長量調査報告(第1回)

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The Sawara Experimental Forest of Kyushu University is a coast-forest covering an area of 52 ha made up by the artificial forestation and natural regeneration. The forest consists of mostly K. UROMATSU (Pinus Thunbergii Parl) of assumed ages of 100 to 150 years, and as it has been designated as a wind-break reserve forest, no tree is felled aside from dead ones, and open spaces in the forest are planted with KUROMATSU. With a view to clarifying the stand composition and the growth of this forest, the author divided the forest into plots of $50 m \times 20 m$ = 0.1 ha, and conducted diameter measurements in each plot in March 1957. Comparison of the results with those of 1929 survey and the stem analysis carried out with five high-aged trees revealed the following. 1) The increase in the number of trees in the past 28 years was 1929, and it was observed that the forested trees were growing steadily. 2) The growth in the same period was 2,790 $m^3$, the rate of growth being 1.3 %. 3) The distribution of number of trees by diameter at breast height and the distribution of volume by D.B.H. had decreased with smaller-diameter trees as compared wite the previous survey and had increased with larger-diameter trees. 4) The time of the maximum current annual growth in total height appeared twice, once at 30-50 years of age and again at 100-120 of age, and the tendency is markedly different from the general tendency. 5) The growth of diameter at breast height showed a variety of changes, influenced by the progress of stand density. 6) As for the time of the maximum average volume growth, the maximum has not been reached until this time point after 123-145 years, 7) The review of the relationship between the number of trees, diameter at breast height and volume, and the distance from the coast line revealed that the central part of the experimental forest had smaller volume than others.I 緒言　II 早良演習林の概要　III 調査方法　IV 材積表の検討　V 結果　VI 総括
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九州大学早良演習林の林分構成ならびに成長量調査報告(第1回)

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