Keywords: constructed duckweed microcosm, phosphorus distribution, lake sediment, phosphate, ammonium, pH values, temperature, eutrophicated lakes, lake restoration, Lemna minor, environmental pollution, water pollution
Effects of environmental conditions on the phosphorus distribution of constructed duckweed (Lemna minor) microcosm
The restoration of eutrophicated lakes using duckweed plants (Lemna minor) is recognised as a potentially low-cost method. In this study, the effects of environmental conditions on phosphorus (P) distribution were investigated in constructed duckweed microcosms by means of 32P isotope labelling; 32P activities in microcosms were monitored to determine P distribution activities. Results indicated that high phosphate, low ammonium concentrations, moderate pH values, and higher environmental temperatures promoted duckweed growth and favoured mobile P release from sediments. Under comfortable conditions, restoration of eutrophic lakes by means of duckweed could, to some extent, reduce internal P loads of lake sediments.