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Study On Aquatic Macrophyte Vegetations And Their Environment Effects In Taihu Lake

Posted on:2007-09-01Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z X LeiFull Text:PDF
GTID:1100360212472797Subject:Aquatic biology
Abstract/Summary:PDF Full Text Request
Macrophytes are important components of shallow lake ecosystems. They are a main primary producer and can significantly affect the processes of eutrophication of lakes. They play a crucial role in the restoration of eutrophied lake ecosystems. Based on the investigation and analysis of physical and chemical characters of water column and sediments, the attributes of submerged macrophytes and floating macrophytes including species composition, the types of community, biomass, water nitrogen and phosphorus concentrations in Taihu Lake, we quantified the effects of the macrophytes on transparence, concentrations of TN, TP and Chl-α in the water column, and concentrations of TN, TP and organic matter in the sediment. By using experimental approach, I investigated the effects of the water and sediments on the growth of Hydrilla verticillata, Potamogeton malaianus, Vallisneria natans, Nymphoides peltatum and Trapa quadrispinosa. Meanwhile, I also studied the capacity of these plants purifying the eutrophicated waters from Taihu Lake.The main life forms of aqutic macrophytes of Taihu Lake are mainly submerged and foating-leaved macrophytes. The submerged macrophyte communities include Ass. Potamogeton maackianus, Ass. Potamogeton malaianus, Ass. Elodea nuttalli, Ass. Myriophyllum spicatum, Ass. Ceratophyllum demersum and Ass. Vallisneria natans. The floating-leaved macrophyte communities have Ass. Nymphoides peltatum, Ass. Nymphoides indica and Ass. Trapa maximowiczii.The distribution and biomass of submerged macrophytes and floating-leaved macrophytes were significantly different between two investigated seasons. Submerged macrophytes dominated the aquatic vegetations in May, and the species...
Keywords/Search Tags:Taihu Lake, Submerged macrophytes, Floating-leaved macrophytes, Water quality, Sediment, Nutrient, Environment effects, Management of macrophytes
PDF Full Text Request
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