Abstract
A nutrient enrichment experiment was conductedin situ in Donghu Lake (30°33'N, 114°23'E), a shallow hypereutrophic lake in Hubei, China through an enclosure(each 2.5×2.5m by 2 m depth) method from July 15 to September 21, 2000. Three duplicated groups, including two treatments and one control, were designed as unfertilized control (C), nitrogen enrichment (N) and phosphorus enrichment (P), and were also compared with neighboring lake water. DenseMicrocystis bloom exclusively dominated in all the enclosures, while no bloom was observed in the lake. All the enclosures had much higher phytoplankton biomass, higher pH values, and higher transparency than the surrounding lake water. Neither nitrogen nor phosphorus addition had significant effect on phytoplankton composition and biomass due to very high nutrient concentration in the lake water. Suitable biological (absence of filter-feeding silver carp and bighead carp) and physical environment (high transparency, high stability and high pH) associate with saturated nutrient concentration contribute to the nuisanceMicrocystis bloom in the enclosures.
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Supported by a key project of the Chinese Academy of Sciences (No. KZCXI-SW-12) and by Foundation of South China Agricultural University for Doctors (No. 4300-K05108).
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Huijuan, T., Ping, X., Liqiang, X. et al. Effect of enclosure and nutrient enrichment onMicrocystis blooms in Donghu Lake. Chin. J. Ocean. Limnol. 24, 278–284 (2006). https://doi.org/10.1007/BF02842628
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DOI: https://doi.org/10.1007/BF02842628