異なる生育環境に由来するヨシの生育特性及び水条件に対する反応

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  • Growth characteristics and water response of reed (Phragmites australis) strains derived from different conditions
  • コトナル セイイク カンキョウ ニ ユライ スル ヨシ ノ セイイク トクセイ オヨビ ミズ ジョウケン ニ タイスル ハンノウ

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For restoration of destroyed natural environment along the lake side, growth characteristics and water response of common reed (Phragmites australis) strains, derived from different habitats, were determined. Three strains were planted under the upland or lowland condition in the experimental field. From the results for two years, all strains grown under upland condition showed better growth as evaluated by growth parameters such as total shoot length, the number of shoots and leaves than those under lowland condition. To determine water response, reed strains were also cultivated in the pots with dry soil or under flooded condition. Under dry condition, all plants reduced their total shoot length and the number of shoots in comparison with those under wet condition, but the growth response to water condition depended on the strains. In particular, most of plants of a strain derived from the wetland died under heavy dry condition. These results suggest that appropriate genotypes of reed adapted to suitable water condition must be used for the establishment of reed stands. However, it is necessary to cultivate under dry condition for first one or two years for stimulation of early growth.

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