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The present yieid table was prepared with a aim to clarifying the growing conditions of larch-forests in Kyushu, studying whether they are fit for species for forest species conversion, and obtaining... a guide in the future management. First, thirty (30) sample areas were selected in the larch forests which were observed to be relatively normal. The data of these sample areas were reviewed and as a result eight (8) sample areas were rejected. Then with the remaining twenty-two (22) sample areas, the constituent elements were computed by the joint use of the formula method and the diagram method. The results thus obtained are summarized in the following table. (Table) This yield table was compared with larch forests in Shinshu District and the following points were found to be the characteristics of larch forests in Kyushu District. 1) The growth in tree height is very poor. 2) In spite of high stand density, the growth in D. B. H. is large. 3) Consequently, the basal area per ha is very large. 4) The thinning yield is small. 5) The time of the maximum total yield mean increment appears at a relatively early age.show more
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I 緒言 II 調査地の概況 III 資料の収集 IV 資料の吟味 V 地位区分 VI 収穫表構成数値の決定 VII 収穫表の検討 VIII 総括
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KJ00005470383