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| The Relationship Between Phytoplankton and Nutrients of Lake Taihu, China |
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| KeyWord:Lake Taihu; phytoplankton; microcystis; nitrogen; phosphorus |
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| Abstract: |
| In order to study the relationship between phytoplankton and nutrients in lake Taihu, field monitoring and analysis were conducted in Zhushan Bay and Gonghu Bay, two regions with different phytocommunities, from March 2010 to February 2011. The phytoplankton number of Gonghu bay showed seasonal decrease, while that of Zhushan Bay where summer serious bloom occurred reached the maximum in summer. Both the total phosphorus（TP） and particulate phosphorus（PP） concentration reached the maximum in summer in Zhushan Bay while winter in Gonghu Bay. In general, the concentrations of phosphorus in Zhushan Bay were higher than those in Gonghu Bay. In the two bays, a high proportion of PP in TP both occurred and dissolved organic phosphorus（DOP） reached the maximum in winter while minimum in summer. Ammonium（NH+4-N） concentration in Zhushan Bay was much higher than that in Gonghu Bay. The seasonal variation of nitrate（NO-3-N） concentration between the two Bays didn′t show large difference while it was not this case in NH+4-N. In Zhushan Bay, NH+4-N could be utilized by phytoplankton to lower concentration than NO-3-N. The variations of phosphorus concentration and phytoplankton number indicated that in algae-dominated regions, mutual promotion existed between the release of sediment phosphorus to overlying water and the increase of phytoplankton number, maintaining even aggravating the bloom. The variations of NO-3-N and NH+4-N concentration and microcystis number indicated that the microcystis of lake Taihu probably utilized NH+4-N preferentially and mainly. Based on these results, a dual management of N and P inputs are needed to control the bloom of lake Taihu and phosphorus concentration reduction also should be taken in consideration. |
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