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Aiming at improving water quality by avoiding eutrophication in Baiyangdian Lake, excessive growth of CLP (Potamogeton crispus) was treated by partial harvesting in spring, by means of an enclosure experiment. CLP was harvested in different proportions and water quality was monitored weekly for 46 days. TN concentrations and total bacterial counts reached a maximum on day 24 post harvest, after which they declined sharply. TP concentrations decreased first and then increased gradually. The highest values appeared in water without any CLP and also in plots where the maximum biomass had not been removed. In contrast, plots in which 20% of the biomass had been retained resulted in lowest TN and TP values. COD concentrations increased in mid-to-late May and this correlated with an increase of biomass. TLI of each treatment peaked at the end of May, and reached highest values in mid-June. The highest TLI value appeared in water without any CLP. The water of plots retaining 20% of maximum biomass resulted in medium nutrition levels, while the other treatments reached TLI levels indicative of light eutrophication. The best harvest time for CLP is mid-May and the best harvest rate, as suggested by this study, is approximately 80% of maximum biomass.

EFFECTS OF CURLY-LEAF PONDWEED (POTAMOGETON CRISPUS L.) BIOMASS ON EUTROPHICATION IN BAIYANGDIAN LAKE