Studies on Artificially Lodged Culm of Phragmites Japonica Steud. to Extend Communities and to Produce Young Shoots for Transplanting

27 Mar Studies on Artificially Lodged Culm of Phragmites Japonica Steud. to Extend Communities and to Produce Young Shoots for Transplanting

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Abstract

ツルヨシの群落拡張と幼苗生産に資する知見は, 今後の水域緑化に求められる重要な課題である。本論ではその基礎的研究として, 人為的に倒伏した地上茎による上記種の群落拡張と幼苗生産の可能性について検討した。倒伏後の地上茎は, 桿の伸長と葉の展開が顕著となった。さらに, 同地上茎は節から多数の幼苗と不定根を発生することで, 広範囲の立地に定着した。群落中央部より群落縁辺部に生育する地上茎で倒伏後の成長は特に著しかった。発生した幼苗を移植した結果, 地上下部は順調に成長し, これらの越冬も確認できた。以上, 群落縁辺部に生育する地上茎を人為的に倒伏することは, ッルヨシの群落拡張と幼苗生産に有用な手段になると推察された。

English Abstract

The research on community extension and young shoot production of Phragmites japonica Steud. becomes an important subject for future waterfront revegetation. Above ground culms were artificially flattened sideways “lodging treatment” in order to do community extension and young shoot production of the above-mentioned species in the present study. The results are summarized as follows; The elongation of the culm and development of the leaf were remarkable in the culms after lodging treatment. The culms fixed to each location by generating produced a large number of young shoots and adventitious roots from the node after lodging treatment. Especially, the growth after lodging treatment was vigorous on the culms which grew further than the central of the community at the margin of the community. The generated young shoots were cut off from the culms, and the young shoots were transplanted. These young shoots smoothly grew and were able to winter. From the above results, the lodging treatment for the culms growing at the community margin was guessed with the usefulness for community extension and young shoot production of Phragmites japonica.