Nitrogen dynamics in large shallow eutrophic Lake Chaohu,China |
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| Authors: | M Zhang J Xu P Xie |
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| Institution: | (1) College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China;(2) Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Science, Wuhan, 430072, People’s Republic of China |
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| Abstract: | Temporal and spatial dynamics of nitrogen in lake and interstitial water were studied monthly in a large shallow, eutrophic
lake in subtropical China from October 2002 to September 2003. The distribution of nitrogen was consistent with the idea that
high nitrogen concentrations in the western part of the lake resulted from high levels of the nutrients from the surrounding
cities through sewage–drainage systems. Nitrate was the predominant form of nitrogen in the overlying water, while ammonium
was predominant in the interstitial water, indicating that strong oxidative nutrient regeneration occurred near the sediment–water
interface. Nitrate could be an important dissolved inorganic matter source for phytoplankton, which in turn influenced the
seasonal variations of nitrate concentrations in lake water. Significant positive correlation between ammonium fluxes and
water temperature was observed and could probably be attributed to the intensified ammonification and nitrate reduction with
increased temperature. Positive correlation between ammonium fluxes and algae biomass and Chl a concentrations may indicate that phytoplankton was an important factor driving ammonium fluxes in our study lake, and vice
versa that higher fluxes of ammonium supported a higher biomass of the phytoplankton. |
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| Keywords: | Nitrogen Eutrophic Flux Sediment– water interface Lake Chaohu |
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