Ecological aspects of Hirosato restoration area in the Kushiro Mire:

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  • NAKAMURA Takatoshi
    Department of Biology, Hokkaido University of Education at Kushiro
  • YAMADA Hiroyuki
    Department of Agricultural Engineering, Graduate School of Agriculture, Hokkaido University
  • NAKAGAWA Yasunori
    Northern Forestry Research and Development Office, Forest Research Station, Field Science Center for Northern Biosphere, Hokkaido University
  • KASAI Yuki
    Kankyo Consultants Co., Ltd.
  • NAKAMURA Futoshi
    Department of Forest Science, Graduate School of Agriculture, Hokkaido University
  • WATANABE Tsunao
    Eastern Hokkaido Regional Office for Nature Conservation, Nature Conservation Bureau, Ministry of the Environment

Bibliographic Information

Other Title
  • 自然再生事業区域釧路湿原広里地区における湿原環境の実態―植生と環境の対応関係からみた撹乱の影響評価―
  • 自然再生事業区域釧路湿原広里地区における湿原環境の実態--植生と環境の対応関係からみた攪乱の影響評価
  • シゼン サイセイ ジギョウ クイキ クシロ シツゲン ヒロサト チク ニ オケル シツゲン カンキョウ ノ ジッタイ ショクセイ ト カンキョウ ノ タイオウ カンケイ カラ ミタ カクラン ノ エイキョウ ヒョウカ
  • Ecological aspects of Hirosato restoration area in the Kushiro Mire: impacts of artificial disturbances on the relationship between distribution of vegetation and hydrochemical environments
  • —植生と環境の対応関係からみた攪乱の影響評価—

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Abstract

Deteriorations of vegetation and hydrochemical environments were examined in the Hirosato restoration area on the margins of Kushiro Mire, where agricultural land use and a drastic increase of alder forest have influenced the ecosystem for the last past halfcentury. The vegetation was classified into seven types, where the meadow types dominate in the pasture area and the alder or fen types are distributed in the mire area. A following Canonical Correspondence Analysis shows two major results: 1) A vegetation gradient from the mire area to the pasture area corresponding to the obvious lowering of the groundwater level, 2) A vegetation gradient from the fen types to the alder types in correspondence to the lowering of the groundwater level and to the decrease of phosphorous concentration coupled with the increase of nitrogen concentration in soil water. The intense decrease of the groundwater level in the pasture area due to the diversion of the neighboring river has probably changed the mire vegetation into meadow vegetation, indicating that serious deteriorations have been introduced artificially. In the mire area, the distribution of the alder forest was mostly affected by hydrological regime in flooding, yet artificial influences could not be specified.

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