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cje ›› 2009, Vol. 28 ›› Issue (10): 2042-2047.

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Effects of  |Ceratophyllum demersum, Bellamya purificata, and their combination on water body’s periphyton content and N and P concentrations.

LAN Ce-jie 1;Bei-xin1;CHEN Kai-ning2;CHEN Ai-qing1;JIANG Li-hong1   

  1. 1Department of Entomology, Nanjing Agricultural University, Nanjing 210095, China;2Nanjing Institute of Geography &|Limnology, Chinese Academy of ,Sciences, Nanjing 210008, China
  • Online:2009-11-10 Published:2009-11-10

Abstract: With simulation test, the effects of Ceratophyllum demersum, Bellamya purificata, and their combination on the water body’s periphyton dry mass (PDM) and the contents of Chla, total N (TN), total P (TP), NO3--N, and NH4+-N were studied. C. demersum increased the PDW and Chla content by 295.62% (P<0.01) and 32.31% (P<0.05), while B. purificata and its combination with C. demersum decreased the PDW and Chla content by 65.69% (P<0.05) and 70.07% (P<0.05), and 46.19% (P<0.01) and 70.16% (P<0.01), respectively. Averagely, C. demersum, B. purificata, and their combination removed TN by 35.18%, 15.27%, and 20.48%, TP by 53.12%, 8.38% and 41.97%, NO3--N by 22.34%, 18.33%, and 10.66%, and NH4+-N by 37.88%, 13.98% and 25.72%, respectively. C. demersum and B. purificata showed antagonism and synergism in removing N and P. Antagonism increased the N and P concentrations to some extent. It was suggested that utilizing submerged macrophytes and snails simultaneously would benefit the improvement of water body quality and the control of eutrophication, and thus, the restor
ation of water ecosystem.

Key words: Beauveria bassiana oil formulation, Ultra low volume, Biological diversity