草型清水态维持与长效运行的营养盐响应机制——以滇池大型围隔试验为例

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Abstract In order to explore the responding mechanism of nutrient concentration on the maintenance and long-term operation of macrophytes-dominated clear water state in lake ecological restoration projects, a large in-situ test enclosure was set up in Caohai, Dianchi Lake. Using the in-situ mesocosms via nonparametric change-point analysis (nCPA) and thresholds indicator taxa analysis (TITAN), nutrient thresholds of chlorophyll a, turbidity, transparency and phytoplankton community were studied. Even in a more successful and long-term clear state enclosure with lower chlorophyll a, the cyanobacteria still absolutely dominated in summer. TN and TP thresholds of the ecological restoration enclosure for chlorophyll a were 1.423 and 0.103mg/L, whereas TN and TP thresholds for transparency were 1.684 and 0.103mg/L, respectively. The mean values of TP in all enclosures was greater than or equal to 0.226mg/L. In the later period, B1, B3, B8 enclosures were in clear water state with the mean values of TN lower than or equal to 1.42mg/L, whereas B5, A1, A2, A3, A4enclosures were in turbid water state with all mean values of TN greater than or equal to 1.78mg/L. These results showed that TN should be primarily considered for the ecological restoration at area with heavy cyanobacteria blooms. When TP concentration severely exceeds the threshold, concentration of TN then becomes the limiting factor, and if kept at low level, the long-term operation of macrophytes-dominated clear water state could still be maintained to achieve the transition from phytoplankton-dominated turbid water state to macrophytes-dominated clear water state.

Key words： eutrophic clear water state maintenance phytoplankton nutrient threshold

Received: 17 February 2020

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X524

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	DAI Liang-liang
	ZHANG Yun
	ZHOU Wei-cheng
	GUO Liang-liang
	LI Gen-bao

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DAI Liang-liang,ZHANG Yun,ZHOU Wei-cheng等. The responding mechanism of nutrient concentration on the maintenance and long-term operation of macrophytes-dominated clear water state: A case study of a large experimental enclosure in Dianchi Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3849-3858.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3849

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