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| Purification of Eutrophic Water by Bermudagrass and Ryegrass Rotation |
| Received:February 27, 2015 |
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| KeyWord:eutrophic water;water purification;bermudagrass;ryegrass |
| Author Name | Affiliation | E-mail | | XU Fang | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China
College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China | | | ZONG Jun-qin | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China | | | NIU Jia-wei | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China
College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Jing-bo | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China | | | LI Dan-dan | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China | | | LI Lan-lan | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China | | | LIU Jian-xiu | Institute of Botany Province & Chinese Academy of Science, Nanjing 210014, China | turfunit@aliyun.com |
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| Abstract: |
| Purification of eutrophic water by biological methods has aroused increasing interests. Here a warm-season forage — Cynodon dactylon Tifton 85 and three cool-season forages— Lolium multiflorum(Tetragold, Jumbo and Maximus) were grown in rotation to examine their purifying abilities for eutrophic water in order to screen out a proper forage combination that can be used year-roundly. The removals of total nitrogen(TN), total phosphorus(TP), and chemical oxygen demand(COD) in the eutrophic water and the nitrogen(N) and phosphorus(P) accumulation in the plants were employed as the indexes for evaluating performance of those plants. The dry biomass of the above-water parts of those plants accounted for more than 71.0% of total dry biomass, and the N and P uptake by above-water parts amounted to more than 76.0% and 84.0% of the total removal by the system, respectively. Purifying abilities of those different plants were significantly higher than that of the control. After 16 days of Tifton 85 treatment, the removal efficiencies of TN、TP and COD were 98.2%,98.3% and 70.7%, respectively, and the TN and TP reduced to non-eutrophic levels while COD dropped to moderate eutrophic level. After 25 days of growth, Tetragold showed the best performance among three ryegrass cultivars, its TN and TP removal efficiencies were 96.8% and 92.1%, respectively, and the COD dropped to moderate eutrophication. All the results indicate that Tifton 85 and Tetragold could be used as an excellent forage combination for purifying eutrophic water over the whole year in the delta region south of Yangtze River. |
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