Changes in lakeside vegetation communities in Lake Izunuma-Uchinuma in northeast Japan from 1976 to 2012

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  • 1976 年から2012 年にかけて伊豆沼・内沼の湖岸植生で生じた マコモ群落の消失と樹林化
  • 1976ネン カラ 2012ネン ニ カケテ イズヌマ ・ ナイヌマ ノ コガンショクセイ デ ショウジタ マコモ グンラク ノ ショウシツ ト ジュリンカ

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Abstract

Changes in the vegetation communities in Lake Izunuma-Uchinuma located in the northern part of Miyagi prefecture, was investigated using aerial photographs in 1976 and 2012. After a flood in 1980, the communities of Indian rice was drastically reduced, and then, disappeared in the most of bank areas by the erosion following the high water level management. In addition, a part of the reed community also decreased from the shoreline side due to erosion. As a result, the area of the lake shore vegetation has decreased from 122.3ha to 59.9ha. Before the 1970s, paddy fields distributed in the lakeside, and there was a traditional use about common reed etc. Thereafter, the paddy fields became renaturalization after the municipalization of the lakeside. Due to these changes in vegetation, there are some problems such as the influence on the ecosystem and the decrease in the association with the local community. In the nature restoration project of Lake Izunuma-Uchinuma, it seems important to properly manage plant communities based on various viewpoints toward solving these problems.

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