衡水湖湿地水生植物生长对水质的影响

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Abstract To investigate the effect of the growth and decomposition of aquatic plants on the water quality of Hengshui Lake, the dynamic parameters of growth decline of Phragmites australis and Typha latifolia in Hengshui Lake were studied. Based on Environmental Fluid Dynamics Code model, a model of water quality and aquatic plant in Hengshui Lake was built, and the growth process and water quality of Hengshui Lake between 2018 and 2022 were simulated, and the time and space impact of plant growth on water quality was analyzed, and then proposing safeguard measures for fine management of water quality in Hengshui Lake adapted to plant growth process. The results indicated that the index of growth and decomposition dynamics of plants was classified as 0.01d^-1 and 0.05d^-1, and the ecological water quality module of Hengshui Lake was established, and the system simulation was carried out. By comparing the area with the plant and the middle lake area, the effect of the plant was reduced by 40% to 60%, the effect was increased by 60% to 80%, and the effect of the plant growth was effective only in the original position and the surrounding 500~1000m area. While 70% of the leaves and stems were harvested in Oct., the maximum ammonia nitrogen concentration was reduced from 1.833mg/L to 1.095mg/L, and decreased by 40.25%. The total phosphorus was reduced from 0. 172mg/L to 0.119mg/L, and the rate of reduction was 30.78%, and the average annual reduction rate was 25.41% and 21.28% respectively. The improvement of ammonia nitrogen and total phosphorus in the west of the Great Lakes was evident, and there was also some improvement in water quality in the center of the Great Lakes. In addition, considering the water depth of Phragmites australis growing at -0.3 ~ 0.7m and Typha latifolia at 0.24 ~ 0.96m, the water level should be controlled to protect the growing conditions, during May to September.

Key words： Hengshui Lake EFDC model aquatic plant plant growth decomposition emergent macrophyte harvesting wetland management

Received: 15 September 2023

PACS:

X524

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	ZHANG Bing-ye
	XIE Pei
	Sun Ming-dong
	LIU Zhen-jie
	SUN Ning
	HUANG Fa-ming
	QIAO Fei

Cite this article:

ZHANG Bing-ye,XIE Pei,Sun Ming-dong等. Impact of aquatic plant growth process on water quality in Hengshui Lake wetland[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 2247-2255.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I4/2247

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