Abstract:
In a kinetic experiment, the absorption of NH
4+, NO
3- and H
2PO
4- by three different emergent macrophytes (
Canna generalis, Cyperus papyrus, Colocasia tonoimo) in waterlogged condition were analyzed in relation to values of landscape esthetics and economic value. Based on the analysis, the uptake rate of H
2PO
4- was highest in
C. generalis. In fact,
C. generalis continued to absorb H
2PO
4- in even low ion concentration conditions. This suggested that
C. generalis successfully coped with a wide range of H
2PO
4- concentration. On the other hand, the uptake rate of NO
3- was highest in
C. papyrus. It was, however, not able to successfully adapt to low nutrient conditions (as
C. generalis). The highest uptake rate of NH
4+ was also in
C. papyrus, and even of low concentrations of NH
4+. Also, NH
4+ absorption was lowest in
C. generalis. The application scope of three plants on restoration of polluted water varied with ion absorption characteristics of the plants.
C. generalis did generally well in all levels of H
2PO
4- polluting water.
C. papyrus, on the other hand, was only suitable for pre-treatment of seriously NO
3- polluting water. Then
C. generali was usable in maintaining water quality after improvement to a certain degree.
C. papyrus was applicable in various concentrations of NH
4+ polluting water.
C. generalis grew better in water environments that were less polluted by NH
4+.