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Tao X.-M.,Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources | Wang X.-Y.,Urban Water Engineering | Wang L.-Q.,Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources | Zheng X.-Y.,Shanghai Aquatic Environment Engineering Company Ltd | Zhang W.,Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources
Journal of Ecology and Rural Environment | Year: 2013

Community structure and species diversity of metazoan zooplankton was investigated monthly from May 2009 to March 2010 in Gehu Lake. A total of one hundred species of metazoan zooplankton were found and identified as 52 species of Rotifera under 25 genera, 21 species of Cladocera under 12 genera, and 27 species of Copepoda under 14 genera. The community was dominated mainly by Brachionus calyciflorus, Brachionus angularis, Polyarthra trigla, copepodid and Bosmina longirostris, with rotifera accounting for 98.7% of the total. The density of the zooplankton was 1 572 L-1 on average annually and peaked in spring, while the biomass of the zooplankton was 2.34 mg • L-1 on average annually and peaked in summer. The biomass of Cladocera was significantly and positively related to the density of Copepoda (r = 0.516, P < 0.01), whereas the biomass of Rotifera negatively related to the biomass of Copepoda. Density and biomass of the metazoan zooplankton varied sharply with the season, showing an descending order of spring, summer, autumn, and winter, and of summer, spring, autumn, and winter, respectively. The values of the Shannon-Wiener diversity index, Margalef species richness index and Pielou index indicate that the Gehu Lake was light to moderate in pollution. Source


Chen P.-P.,Shanghai Ocean University | Zhao F.-B.,Shanghai Aquatic Environment Engineering Company Ltd | Wang L.-Q.,Shanghai Ocean University | Ji G.-H.,Shanghai Ocean University
Journal of Ecology and Rural Environment | Year: 2013

An experiment was designed to have 5 treatments, i. e. 0, 1, 2, 4 and 6 mg · L -1 of %(Cu2+) to explore effects of Cu2+ on growth and physiological indices of Vallisneria natans. Results show that tiie effect of Cu2+ stress on V natans was significant. When % (Cu2+) was 2 mg · L -1, growth of V natans was inhibited with the plants shortened in plant height and reduced in fresh weight, but they still survived. When % (Cu2+) was 4 mg · L -1, the phenomena of inhibition became more obvious on the plants, of which the outer leaves began to decay and turn black after 30 days of stress. A trace amount of Cu2+ was conducive to activation of catalase (CAT) and enhancement of stress resistance of tiie plants. The experiment found that CAT reacted earlier than MDA and H2O2 did, therefore, it was more accurate and effective to monitor changes in CAT activity for physiological studies of stress resistance of V natans. As 2 mg · L-1 of % (Cu2+) can inhibit tiie growth of V. natans, so that, it is not suitable to build any Cu2+ -contaminated wastewater purification system with V natans as submerged vegetation when Cu2+ concentration in the wastewater is higher than 2 mg· L-1. Source


Chen L.,Shanghai Aquatic Environment Engineering Company Ltd | Tao H.,University of Shanghai for Science and Technology | Pang T.,University of Shanghai for Science and Technology | Dong J.,University of Shanghai for Science and Technology | Song X.,University of Shanghai for Science and Technology
Chemistry Letters | Year: 2015

In this paper, ordered mesoporous carbon (OMC)/graphitic carbon nitride (g-C3N4) composites were synthesized by a simple low-temperature thermal method. The structural properties of the OMC/g-C3N4 composites were characterized by XRD, N2 adsorptiondesorption isotherms, and UVvis diffuse reflectance spectroscopy. It was found that the addition of OMC slightly affected the graphitic stacking structures of g-C3N4, but strongly enlarged the surface area and total pore volume of OMC/g-C3N4 composites. The photodegradation of rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) under visible light irradiation was tested. The photocatalytic efficiencies of the 0.04-OMC/g-C3N4 composite over RhB and 2,4-DCP were about 2.41 times and 3.68 times as high as those of g-C3N4, respectively. It is deduced that the enhanced photocatalytic activity should be attributed to the larger specific surface area and favorable optical property. © 2015 The Chemical Society of Japan. Source

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