A comparison of wetland plant species richness and taxonomic composition among land-use types in a lowland paddy region on the Echigo Plain, Japan

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  • Ishida Shinya
    Graduate School of Science and Technology, Niigata University
  • Takanose Yoichiro
    Center for Transdisciplinary Research, Niigata University:(Present office)Green sigma Co., Ltd
  • Kamitani Tomohiko
    Graduate School of Science and Technology, Niigata University

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Other Title
  • 新潟県越後平野の水田地帯に出現する水湿生植物 : 土地利用タイプ間における種数と種組成の相違
  • ニイガタケン エチゴ ヘイヤ ノ スイデン チタイ ニ シュツゲン スル ミズ シッセイ ショクブツ : トチ リヨウ タイプ カン ニ オケル シュスウ ト タネ ソセイ ノ ソウイ

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Abstract

As part of a program for the conservation of wetland plants in Japanese lowland paddy regions, we compared plant species richness and taxonomic composition among four land-use types on the Echigo Plain: cultivated paddy fields, fallow (including abandoned) paddy fields, soil-lined irrigation canals, and concrete-lined irrigation canals. Species compositions were similar across cultivated fields. Total species richness was lower in these fields than in fallow fields and soil-lined irrigation canals. Species of annual and winter-annual herbs (including endangered taxa) occurred regularly in cultivated fields. Species composition varied among fallow fields, which supported the highest species richness across land-use types. Some of the fallow fields provided important habitat for species (particularly perennial herbs) that were rare on cultivated land. Concretelined irrigation canals contained very few species, but soil-lined canals supported a diversity of taxa. Most floating-leaved and submerged species occurred only in soil-lined irrigation canals. Thus, we suggest that wetland plants unique to each land-use type should be preferentially conserved, thereby enhancing overall diversity across the whole region.

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