Effect of past topsoil removal on the current distribution of threatened plant species in a moist tall grassland of the Watarase wetland, Japan: Mapping of selected sites for wetland restoration by topsoil removal

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  • Obata Tomoko
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Ishii Jun
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Kadoya Taku
    Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
  • Washitani Izumi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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Other Title
  • 渡良瀬遊水地における過去の掘削履歴が絶滅危惧植物の現在の分布に及ぼす影響と影響評価地図
  • ワタラセ ユウスイチ ニ オケル カコ ノ クッサク リレキ ガ ゼツメツ キグ ショクブツ ノ ゲンザイ ノ ブンプ ニ オヨボス エイキョウ ト エイキョウ ヒョウカ チズ

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Abstract

The Watarase wetland is a floodplain wetland in central Japan dominated by two tall grasses, Phragmites australis and Miscanthus sacchariflorus, which grow in moist soil. To determine whether topsoil removal for wetland restoration can affect threatened plants in the moist tall grassland, we analyzed the effects of past topsoil removals conducted over the past 48 years to extract soil for civil works projects on the current distribution of threatened species. In our study area (total number of 10 m × 10 m quadrats: n = 11,514), the occurrence frequency of 8 of 26 study species was equal to or greater than 20%, but was less than 10% for the rest of the species. Generalized linear models of the former species revealed that past topsoil removal had significant positive effects on the ranked abundance of six species. Although the removal had significant negative effects on the other two species, their occurrence frequency was more than 50%. Based on these results, as well as occurrence data and other ecological knowledge of threatened species and occurrence data of the invasive species Solidago altissima, we drew an impact potential map to select sites for wetland restoration by topsoil removal.

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