THE RELATIONSHIP BETWEEN P, FE AND MN UPTAKES BY SUBMERSED ROOTED ANGIOSPERMS

Three species of submersed rooted aquatic angiosperms (Lagarosiphon ma jor, Myriophyllum triphyllum and Potamogeton ochreatus) were grown on nutrient-rich and nutrient-poor sediments in Lake Taupo, an oligotroph ic New Zealand lake. Results indicate that plants grown on nutrient-ri ch sediments had significantly higher shoot tissue concentrations of P , Fe and Mn than those grown on nutrient-poor. Ki,oh correlations betw een all three nutrients were recorded for all species. This suggested that the availabilities of P, Fe and Mn in these sediments to these aq uatic plants were interrelated.