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| Water Purification and productivity of Ipomoea aquatica Grown on River Water Flowing to Xingyun Lake in Yunnan Province |
| Received:July 14, 2014 |
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| KeyWord:Ipomoea aquatic;floating-bed;Xingyun Lake;river water flowing to lake;purification effectiveness;productivity |
| Author Name | Affiliation | | YANG Shao-cong | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | L譈Yan-ling | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | MU Chan | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | ZHANG Yan-jun | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | QIAN Rong-qing | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | LI Xiao-liang | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China | | LI Quan-qing | Yuxi Academy of Agricultural Sciences, Yunnan Province, Yuxi 653100, China |
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| Abstract: |
| Purification of eutrophic water by aquatic plants is an ecological practice widely used in recent years. To make use of N and P resources in river water flowing to Xingyun Lake in Yunnan Province, to reduce the lake eutrophication and to protect the lake ecosystem, micro-plot trials, macro-plot trials, static trials and dynamic trials were carried out from 2010 to 2013. The purification effectiveness and productivity of Ipomoea aquatica grown in floating-beds on river water were studied. Results showed that Ipomoea aquatica had a high purification effectiveness. Under static conditions, removal rates of total N and water-soluble P by Ipomoea aquatica from river water were greater than 90%, while the rates were about 50% under dynamic conditions. Average amount of N, P, and K absorption by Ipomoea aquatica in river water was 348.4 kg·hm-2·a-1, 50.9 kg·hm-2·a-1 and 530.4 kg·hm-2·a-1, respectively. Most of these nutrients (93.0%) were accumulated in the stems and leaves of Ipomoea aquatica. Average amount of river water purified by Ipomoea aquatica calculated by water-soluble N and water-soluble P was 27 321 m3·hm-2·a-1 and 67 569 m3·hm-2·a-1, respectively. The growth of Ipomoea aquatica was positively correlated with N and P concentrations in the river water, and average fresh weight of stems and leaves was up to 112 032.0 kg·hm-2·a-1. Therefore, it is obvious that growing Ipomoea aquatica in floating-bed on river water not only improves water quality in Xingyun Lake, but also provides significaant economic benefits. |
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