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For the purpose of investigating the influence of pruning on the growth of HINOKI (Chamaecyparis obtusa ENDL), the author established five test areas as shown in the table in Kasuya Experimental Fores...t attached to the Agricultural Department of Kyushu University, in February 1960. (TABLE) In March 1962, the growths in tree height, diameter at breast height, diameter at 3.2 m height (in Test Area No. 1) or at 5.2 m height (in the other test areas) above the ground and stem volume were measured. The results obtained are summarized as follows. 1) In Test Area No. 1, the growths in the diameter at breast height, diameter at 3.2 m height above the ground and stem volume decreased in proportion to the increase of the degree of pruning, but the growth in tree height was reduced only in case of 80 per cent pruning of tree height. 2) In Test Area No. 2, the growths in each component decreased in proportion to the increase of the degree of pruning. 3) In Test Area No. 3, the diameter at breast height, diameter at 5.2 m height above the ground and stem volume decreased in proportion to the increase of the degree of pruning, but the influence of pruning on the growth in tree height was not observed. 4) In Test Area No. 4, no influence of pruning was observed. 5) In Test Area No. 5, the growths in the diameter at breast height and stem volume decreased in proportion to the increase of the degree of pruning, and the growth in the diameter at 52 m height above the ground was reduced only in case of 80 per cent pruning of tree height. But the growth in tree height was not influenced by pruning.show more
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| Table of Contents |
I 緒言 II 試験地の設定 III 枝打後2年間の成長量 IV 総括 参考文献 Resume
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