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.
