An Experimental Study on the Effects of Wind and Propping on the Growth of Liriodendron Tulipifera L.

27 Mar An Experimental Study on the Effects of Wind and Propping on the Growth of Liriodendron Tulipifera L.

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Abstract

風が樹木の生育に及ぼす影響と支柱の効果について検討する目的で,ユリノキの2年生個体を用い, 支柱をせずに風を当てた風区, 支柱をして風を当てた風・支柱区, 風を当てずに支柱をした支柱区, 処理を加えない対照区の4区で地上部, 地下部の成長を比較した。その結果, 地上部では, 風区で主幹と枝の節間の伸長成長, 支柱区で主幹の肥大成長が抑制される傾向が見られた。また, 風.支柱区では, 成長が全体的に抑制されていた。 地下部については, 風区では風上側, 側面に比べ風下側で細根・中径根が抑制された。また, 支柱区では支柱側よりも反対側で小径根が多くなった。これら2処理区に対し, 風・支柱区では方向による有意差は見られなかった。

English Abstract

The purpose of this experiment is to clarify the influence of wind and propping on growth of 2-year-old tulip tree (Liriodendron tulipifera L.). To compare the tree growth, we set up four kinds of section ((1)Wind, (2)Wind and Propping, (3)Propping, (4)Control). As a result, the growth of a trunk and a branch were controlled in the wind section. In the propping section, the enlarge growth of a trunk were controlled. On the other hand in the wind and propping section, the growth of trunk and branch was prevented in general. About the root system, there were more roots in the windward side in the wind section. And in the propping section, there were more roots at the opposite side to the prop. Comparing with these two sections, the root volume in the wind and propping section was districted in all directions.