観測と再生長モデルによる刈取られた　ヨシ　Ｐｈｒａｇｍｉｔｅｓ　ａｕｓｔｒａｌｉｓ　の回復過程の評価

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  • Evaluation of the recovering process of Phragmites australis after cutting by the dynamic regrowth model and the validation by the observation
  • カンソク ト サイセイチョウ モデル ニ ヨル カリトラレタ ヨシ Phragmites australis ノ カイフク カテイ ノ ヒョウカ

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Shoots cutting of Phragmites australis is a common management to maintain botanical diversity in wetland and restore derelict wetland condition. Associated with the recent development of the dynamic growth model of P. australis the modeling of recovering process of P. australis was developed based on the experiments and energetic consideration for the possible application in the management of wetlands. Three years observations were conducted for P. australis to evaluate the recovering process in a swampy section of Akigase Park in Saitama, Japan. The growth of P. australis was impaired most by June cutting, while June and July cutting increased the ratio of the leaf biomass to stem biomass of regenerated shoot after cutting, approximately by 0.28 to 0.56. June cutting reduced the shoot height and the biomass of rhizomes and shoots markedly. P. australis community cut in summer, on the other hand, mostly recovered in two years, indicating the necessary cutting every one to two years interval. Revised model could simulate well both the observed data and literature data of cutting or burning. Consequently it is found that P. australis grow in the nutrient rich condition can recover three to four years from cutting, on the other hand that in nutrient poor condition request over ten years for recovering.

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