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| Effects of Light Intensity and Epiphytic Algae on Physiological Parameters of Myriophyllum spicatum |
| Received:September 22, 2014 |
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| KeyWord:light intensity;epiphytic algae;Myriophyllum spicatum;physiological parameters |
| Author Name | Affiliation | | SONG Yu-zhi | Collaborative Innovation Centre of atmospheric environment and equipment technology(AEET), Nanjing University of Information Science & Technology, Nanjing 210044, China
International Center for Ecology, Meteorology and Environment(IceMe), School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | KONG Fan-fan | International Center for Ecology, Meteorology and Environment(IceMe), School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | WANG Min | College of Environmental Science and Engineering, Nanjing University of Science Information & Technology, Nanjing 210044, China | | ZHANG Yan-na | International Center for Ecology, Meteorology and Environment(IceMe), School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: |
| Submerged macrophytes have played important roles in remediating eutrophicated water. However, epiphytes often compete light with macrophytes, thus influencing macrophyte growth and in turn water purification efficiency. In the present study, a 2×3 factorial experiment with two epiphytic algal conditions(with epiphytic algae and without) and three different levels of light intensity(10% natural light(39.6~75.6 μmol·m-2·s-1), 50% natural light(104.4~140.4 μmol·m-2·s-1) and 100% natural light(210.2~230.4 μmol·m-2·s-1) was conducted with Myriophyllum spicatum for four weeks. Chlorophyll content, soluble protein content, MDA content and SOD activity were measured to reveal physiological responses of M.spicatum to light intensity and epiphytic algae. Chlorophyll content of M. spicatum decreased, while MDA content increased with increasing light intensity. Soluble protein content and SOD activity increased with increasing light intensity at the beginning of the experiment, but decreased at the end of the experiment. Chlorophyll content, soluble protein content and SOD activity in M. spicatum were higher in the treatments without than with epiphytic algae under the same light conditions, but MDA content was opposite. Light intensity and epiphytic algae and their interactions had significant effects on the physiological parameters of M. spicatum(P<0.05). High light intensity(100% natural light) with epiphytic algae was the worst condition for M. spicatum. The present results indicate that M. spicatum would grow best under relatively low light conditions(10% natural light) without the presence of epiphytic algae. |
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