Effects of latitude, nutrients in soil and preemption on the long-term competition process of emergent macrophytes

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  • TANAKA Norio
    Department of Civil and Environmental Engineering, Faculty of Engineering, Saitama Univeristy
  • ASAEDA Takashi
    Graduate School of Science and Engineering, Saitama University

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  • 抽水植物の長期競合に緯度，土壌栄養塩と先取り状態が与える影響
  • チュウスイ ショクブツ ノ チョウキ キョウゴウ ニ イド ドジョウ エイヨウエン ト サキドリ ジョウタイ ガ アタエル エイキョウ

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Abstract

Long-term competitive growth of Typha latifolia and Typha angustifolia were analyzed for evaluating the influence of latitude, nutrient accumulation in soil and preemption. The competitive analysis showed that T. angustifolia has superiority against T. latifolia without preemption even in shallow water. By the accumulation of nutrients in soil, more densely preempted T. latifolia can be displaced by T: angustifolia. T. latifolia in lower latitude is more easily displaced by T. angustifolia. Competitive analysis of Phragmites australis and Typha spp. showed that the preemption by Typha orientalis has effective only for T. latifolia and Phragmites has strong superiority against T. latifolia and T. orientalis. and has slight superiority against T. angustifolia in nutrient rich condition. The competition is related to belowground storage and utilization strategy in each species.

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