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| 松嶋, 卯月; 武田, 一夫; Tanino, Karen K.. |
| In order to clarify the role of the vascular system for creating ice segregation, the water pathway through the stem of Keisukea japonica and the freezing front of ice segregation were investigated. Harvested stems of Keisukea japonica were used as plant samples. The water pathway was visualized with a 2.5mM fluorescein solution. After ice segregation was induced, the stem was tightly fixed on a microtome that cross sectioned the stem every 40μm. The light source with excitation filter illuminated the stem cross section. Fluorescence emission was captured by using CCD camera with fluorescent filter. Three-dimensional fluorescent image was reconstructed from the series of captured images. By observing horizontal cross sections, fluorescent illumination... |
| Ano: 2014 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4508 |
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| 辻, 修; 宗岡, 寿美; 武田, 一夫; 土谷, 富士夫; TSUJI, Osamu; MUNEOKA, Toshimi; TAKEDA, Kazuo; TSUCHIYA, Fujio. |
| 日本の最北端に位置する北海道の十勝地方音更町において，GIS 上に耕地防風林のデータベースを構築することにより，その実態を明らかにし，耕地防風林の減少に歯止めをかけることを目的とした。その結果，音更町の耕地防風林延長は，1995 年が242.3 km，2003 年が255.0 km であり，この8 年間で12.7 km 増加した。耕地防風林樹種別延長割合は，2003 年度においてカラマツ (Larix kaempferi (Lamb.) Carriere) 74.9％，シラカンバ(Betula platyphylla sukatchev var. japonica (Miq.) Hara)9.5％，トドマツ (Abies sachalinensis Fr. Schm.) 3.0％，アカエゾマツ (Picea glehnii (Fr. Schm.) Masters.) 0.5％，その他12.1％ であった。耕地防風林延長を樹高別で比較すると，この8 年間において樹高20 m 以上の耕地防風林は54 km も減少したが，10 m 以下の耕地防風林は7 km しか増加しなかった。耕地防風林の減風効果領域は延長と逆に，この8 年間で1,423 ha も減少した。耕地防風林の減風効果領域と風害発生箇所の関係より，耕地防風林が風害防止に効果を発揮していることが再確認できた。 This research was done to slow the decrease in the use of windbreaks by preparing windbreaks database showing their effectiveness in preventing wind damage in Otofuke, Tokachi... |
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Palavras-chave: 耕地防風林; GIS; 風害; カラマツ; 十勝地方; Windbreak; GIS; Wind erosion damage; Larch; Tokachi region. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2873 |
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| Takeda, K; Suzuki, T; Yamada, T; 武田, 一夫. |
| Following a comprehensive field studyevaluatingthermal, hydraulic, and mechanical stabili-ties of a slope covered with Sasa nipponica, a type of dwarf bamboo (known as Sasa), against slope failure in a cold region (eastern Hokkaido in Japan), it was found that thermal stability increases due to a decrease in freezing and frost heaving of the surface layer caused by the adiabatic effects of Sasa litter and the snow it retained. Further, Sasa plays a role in reducing the effect of rainfall due to the water retention by the Sasa rhizome layer in the surface soil, thereby increasing hydraulic stability. Through surveys of surface failures caused by an earthquake in places on wild slopes covered with Sasa, the mechanical stability was evaluated using the safety... |
| Ano: 2009 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2667 |
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