三春ダムの試験湛水が斜面の植物群落の組成に与えた影響 The impact of first filling on the composition of a forest community at the Miharu Dam reservoir, Fukushima Prefecture, northeast Japan

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  1.常時満水位(EL.326.0m)以上を伐採せず試験湛水を迎えた福島県三春ダム貯水池湖岸の斜面において,試験湛水による群落組成の変化を追跡した.<BR>  2.調査対象とした斜面は,クリ-コナラ林であり,低木層・草本層にはニッコウザサ,アズマネザサ,ニシキギ等が生育していた.<BR>  3.冠水日数53日以上の斜面において,湛水終了の翌年から高木層で枯死する個体も見られ,植被率が低下した.冠水日数37日程度までの斜面ではクリ-コナラ林では高木への影響は少ないと考えられた.<BR>  4.低木層・草本層に対する試験湛水の影響が明らかに及んだ範囲は,相観的にも種組成の変化が顕著な範囲,冠水日数が37日程度,EL.326.0-329.0m,常時満水位時の汀線より標高差で3m程度であった.<BR>  5.群落組成の変化の主な要因は,試験湛水に伴う高木,低木,草本の枯死や,高木層の植被率の低下等,日照条件の変化が大きいと考えられた.<BR>  6.試験湛水により冠水した標高差7mのうち,斜面上部に位置する4mの範囲(EL.329.0-333.0m),冠水日数37日程度までの斜面は,高木の枯死はなく,低木層・草本層の変化も少なく,樹林は維持された.

Increasingly, recent dam projects have left forests that are above the expected normal water level. However, few researchers have investigated the changes in these inundated stands following first filling. We therefore investigated changes in the composition of the vegetation community after first filling at the Miharu Dam, Fukushima Prefecture, in the Tohoku district of Japan. This research was conducted on transects established in a forest dominated by Castanea crenata and Quercus serrata. A survey conducted in the year following first filling revealed that trees that were submerged for 53 days died. Significant changes were observed in the vegetation community in the lower parts of the slope, between EL. 326.0 and 329.0m, in areas that were submerged for about 37 days. Pioneer species such as Rubus crataegifolius increased in areas with decreased canopy cover. The main factor contributing to the changes in the community composition was probably the change in light conditions following the death of trees. The upper 4m (EL. 329.0-333.0m) of the 7m slope affected by first filling were inundated for less than 37 days. All trees in this area survived, and only minor changes were observed in the shrub and herb layers, suggesting that the forest was preserved.

収録刊行物

  • 植生学会誌

    植生学会誌 20(2), 71-82, 2004

    植生学会

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各種コード

  • NII論文ID(NAID)
    110007522343
  • NII書誌ID(NCID)
    AA11347548
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13422448
  • NDL 記事登録ID
    6982649
  • NDL 雑誌分類
    ZR3(科学技術--生物学--植物) // ZU4(書誌・図書館・一般年鑑--専門書誌)
  • NDL 請求記号
    Z18-3499
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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