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| Correlation between diurnal variation of purification effects and physiological characteristics of Nymphaea tetragona |
| Shanghai Key Laboratary of Urbanization and Ecological Restoration, College of Resources and Environmental Science, East China Normal University, Shanghai 200062, China) |
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Abstract Based on field test method, hydroponic plant purifying-tanks were used to investigate the correlation between diurnal variation of black and malodorous river water purification and physiological characteristics of Nymphaea tetragona on a sunny day. The results indicate that with diurnal variation of light intensity, Chla, Chlb and SP contents of the leaves show doublepeak style at about 12:00 and 14:00, and POD and CAT activities of the roots show singlepeak style at about 13:00. Removal rate of CODCr, NH+4-N, TN, TP of plant purifyingtanks also show singlepeak style at 13:00. Chla, Chlb and SP contents of the leaves, POD and CAT activities of the roots have a significantly positive correlation with removal rate of CODCr, NH+4-N, TN, TP. Physiological characteristics of Nymphaea tetragona have a remarkable impact on the treatment ability of plant purifyingtanks.
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2011, Vol. 32 
