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発表 Adaptation of Alnus japonica to inundation environments by type in Kushiro Mire

作成年度 2010年度
論文名 Adaptation of Alnus japonica to inundation environments by type in Kushiro Mire
論文名(和訳) 釧路湿原におけるハンノキ形態による冠水環境への適応について
論文副題
発表会 8th International Symposium on Ecohydraulics
誌名(No./号数)
発表年月日 2010/09/13 ~ 2010/09/16
所属研究室/機関名 著者名(英名)
道東支所矢野 雅昭(YANO Masaaki)
水環境保全チーム水垣 滋(MIZUGAKI Shigeru)
水環境保全チーム林田 寿文(HAYASHIDA Kazuhumi)
寒地河川チーム村上 泰啓(MURAKAMI Yasuhiro)
抄録
To elucidate the effects of inundation on the habitat of various forms of Alnus japonica in wetland areas、 the tree height、 base height and maximum root height for each A. japonica tree were investigated at 15 sites near groundwater level gauge stations in northern Japan’s Kushiro Mire. The base height in most cases was found to be above ground level. The maximum root height was equal to or above the mean water level、 suggesting that the root system may affect the habitat of A. japonica. The frequency of inundation at the maximum root heights for various periods was calculated for each tree; the results indicated that no tree over 5 m in height which inundated over a period of one week was found in trunk and sprouting types、 while some smaller than 5 m in height which inundated over three weeks were found in sprouting type tree. We also researched tree populations changing that inundated at the maximum root height as a percentage of all surveyed with different periods of continuous inundation. the results showed that the percentage of inundated trees decreased sharply over inundation periods from 12 hours or a day to one week. Trunk-form trees、 for example、 decreased from 83% to 17% over a period of continuous inundation for 12 hours to a week、 and those in sprouting form decreased from 81% to 17% over the same period.
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