水生植物种类及覆盖率水质净化效果研究

doi:10.16378/j.cnki.1003-1111.21193

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Abstract In order to evaluate the purification effect of different aquatic plant species and floating bed coverage on aquaculture water, s100 g of 7species of aquatic macrophytes including Hydrilla verticillata, water spinach (Ipomoea aquatica), iris (Iris tectorum), lettuce (Lactuca sativa), mushroom grass (Hydrocotyle nymphoides), Typha orientalis and Oenanthe javanica were fixed on a 20 cm×30 cm floating bed in a plastic bucket with length of 108 cm×width 60 cm×height 65 cm, and H.verticillata were directly soaked in the water. The experimental water was from an aquacultureaerated pond covered with a light-transmitting plastic sheet at a salinity of 4.5. Meanwhile, 2.0 m×4.0 m PVC pipe structure ecological floating beds were set up in 9 aquaculture ponds with an area of about 6670 m², and water spinach was arranged according to the coverage rate of 2.5%, 5.0% and 10.0%, and the removal of main water quality indicators by each aquatic plant was analyzed at different times.Results showed that water spinach had the maximal removal of total nitrogen, total phosphorus, and chemical oxygen demand, and H.verticillata had the best removing effect on ammonia nitrogen and nitrate nitrogen.The principal component analysis revealed that water spinach showed the best comprehensive purification effect of eutrophic water, followed by Iris tectorum,T.orientalis, H.nymphoides, H.verticillata, O.javanicaand L. sativa.There were significantly lower contents of total nitrogen, total phosphorus, ammonia nitrogen, nitrate nitrogen, and chemical oxygen demand at different floating bed coverage than those in control group, with the best effect in 10.0% coverage group.Therefore,water spinach led to significantly reduce the eutrophication level and to improve the water quality of aquaculture ponds. The removal rate of total nitrogen, total phosphorus, ammonia nitrogen, nitrate nitrogen, and chemical oxygen demand was in accordance with the coverage of floating bed. The floating bed coverage rate of 10% is recommended.

Key words： aquatic macrophyte floating bed coverage water purification Ipomoea aquatica

Received: 12 September 2021

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	Articles by authors
	NI Meng
	CHU Tianjiang
	LIU Mei
	LIAN Qingping
	GUO Aihuan
	ZOU Songbao
	ZHOU Dan
	ZHOU Zhiming
	YUAN Julin

Cite this article:

NI Meng,CHU Tianjiang,LIU Mei, et al. Effects of Different Aquatic Macrophytes and Coverages on Purification of Aquaculture Wastewater[J]. Fisheries Science, 2023, 42(6): 1063-1071.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.21193 OR https://www.shchkx.com/EN/Y2023/V42/I6/1063

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