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| Growth Characteristics and Sewage Cleaning Effect of Five Wetland Plants |
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| KeyWord:wetland plants; photosynthesis; chlorophyll fluorescence; biomass; sewage clean |
| Author Name | Affiliation | | LI Long-shan | College of Life Science, Ningxia University
State Key Laboratory of Seeding Bio-engineering | | NI Xi-lu | State Key Laboratory of Seeding Bio-engineering | | LI Zhi-gang | State Key Laboratory of Seeding Bio-engineering | | LI Jian | State Key Laboratory of Seeding Bio-engineering |
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| Abstract: |
| Five species of wetland plants, including Phragmites australis, Lythrum salicaria, Scirpus planiculmis, Scirpus validus and Typha angustata, were selected to grow in sewage. Their biological characteristices were assessed and their capability to remove nutrients, such as chemical oxygen demand（CODCr）, total phosphorous（TP）and ammonia nitrogen（NH+4-N）in constructed wetland systems, was analyzed. During the experimental period, the growth characteristices and sewage cleaning effect of each plant was evaluated by both physiological and chemical methods. The results demonstrated that the plants cultivated in sewage grew better than those in tap water as measured by plant photosynthesis, chlorophyll fluorescence, plant height, and biomass. There were significant differences between the plants growing in tap water and in sewage as measured by net photosynthetic rate, Fv/Fm, Chlorophyll content（P<0.05）of Typha angustata, Scirpus validus and Phragmites australis（P<0.05）. Furthermore, it was shown that all of the five species are highly efficient in removing CODCr、TP and NH+4-N, as the concentration of CODCr was decreased from 192 mg·L-1 to 8～19 mg·L-1, TP from 1.46 mg·L-1 to 0.04～0.15 mg·L-1, and NH+4-N from 1.26 mg·L-1 to 0.01～0.1 mg·L-1. We conclude that the five species grow better in the sewage than in the tap water. Typha angustata, Scirpus validus and Phragmites australis are the better ones among the five in remedying eutrophic water and improving water quality, followed by Lythrum salicaria and Scirpus planiculmis. |
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