Analysis of Water Quality and Its Purified Function of Wetland Ecosystem in the Dongping Lake
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Abstract:
Based on the monitoring data of the wetland ecosystem of the Dongping Lake from 2009 to 2011 and previous studies, the spatial and temporal variation of wetland water type and water nutrients and the purified function of wetland plants, soil, and hydrology were analyzed, and the reason of water quality variation and purified mechanism were discussed. The results showed that (1) the water type in the Dongping Lake has changed from carbonate-type in the 1980s to sulfate-type due to human activities; (2) the contents of total nitrogen (TN) and total phosphorus (TP) in the lake inlet are higher than those in the lake outlet as a result of pollution in the river flowing into the lake; (3) the contents of TN and TP in the 2000s decrease by 12% and 55% compared with those in the 1990safter pollution control; (4)the removal rates of potamogeton crispus on TN and TP in the wetland reach 85% and 54%, respectively; and (5) the contents of TN and TP are lower in both flood and dry periods than those in the normal period. Therefore, the purified function of wetland ecosystem in the Dongping Lake is related to the soil, plant, and hydrology and human activities.
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