Effects Of Cutting On The Growth, Removal Capacity Of Nitrogen And Phosphorus Of Reed Community In Riparian Wetland

Lake eutrophication is a serious problem caused by overloading of nutrients such asnitrogen, phosphorus. It changes the type and quantity of aquatic organisms, as well as damagethe ecological balance of waters and jeopardize the health of humankind. It needs to takecomprehensive governance technologies including engineering, chemical methods andbiological measures to alleviate eutrophication. One kind of biological measures is to cultivatereeds which have higher ability of pollutant self-purification to regulate eutrophication becomesa hotspot. In this thesis, the effects of harvesting on the biomass and nitrogen, phosphoruscontent and storage of the reeds （Phragmites australis） in estuarine wetland, Baidu Port, YixinTaihu Lake were studied by using in-situ enclosure methods, to provide theoretical basis for themanagement of reed community in Taihu wetland. The main results are as follows：（1） The stem, leaf and aboveground biomass of reed community in cutting sample plots（not include the cutting part） are lower than those of uncutting sample polts after treating（July-September）, and the differences between them are highly significant.（2） The variation tendency of nitrogen and phosphorus content of reeds in cutting sampleplots and uncutting sample polts is similar after treating（July-September）, and the differencesbetween the nitrogen and phosphorus content of reeds in them are not significant. The nitrogenand phosphorus storage of reed community in cutting sample plots are lower than those ofuncutting sample polts after treating（July-September）, and the differences between them arehighly significant.（3） The removal of nitrogen and phosphorus in cutting sample plots(28.70g·m^-2,2.01g·m^-2)is higher than those in uncutting sample polts(20.95g·m^-2,1.45g·m^-2), and the differencesbetween them are highly significant.（4） The nutrition content in sediment and water in cutting sample plots is lower than thosein uncutting sample plots after treating（July-September）, and the differences between them isnot significant.（5） The net photosynthetic rate, transpiration rate and light use efficiency in cutting sampleplots is higher than those in uncutting sample polts in July and September, and the differencesof net photosynthetic rate between them is significant in July.