香溪河库湾水质特征与非回水区水华响应关系

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Abstract

In order to explore the signs and mechanisms of the algal blooms in the river where the backwater of the Xiangxi River are weak. Based on field data during the high-period, such as temperature, conductivity, Chl-a and the flow rate, the Xiangxi River backflow phenomenon basically ended at XX05(XiaKou Town), so the study was conducted at XX06-XX09; the algal blooms happened in July, Chl-a was above 100μg/L, and different kinds of algal blooms on XX05-XX06 and XX07-XX09; in the study area, the water temperature stratification was not obvious. The theory that water temperature stratification was the main cause of blooms was not very suitable for this water area. The study of conductivity showed that there was a significant inflection point in the vertical direction, and the inflection point depth was between the critical layer and the light compensation layer, and had a significant negative correlation with the distribution of chlorophyll a content. The average values of total nitrogen (TN) and total phosphorus (TP) in Xiangxi River were 1.849mg/L and 0.157mg/L, which exceeded the criterion of the eutrophication. The nitrogen and phosphorus content had no significant correlation with Chl-a. Other ions except N and P nutrients played an important role in the algal blooms. After the algal blooms, the conductivity gradually recovered lower from the surface to the bottom vertically, and had obvious response with the bloom and regression of algal blooms.

Key words： Xiangxi River algal blooms conductivity prediction of algal blooms critical depth theory Chl-a

Received: 21 November 2018

PACS:

X524

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	Articles by authors
	ZHANG Qing-wen
	SONG Lin-xu
	JI Dao-bin
	FANG Hai-tao
	HE Jin-yan
	HUO Jing
	LIU Xing-yuan
	WANG Yao-yao
	ZHU Xiao-sheng

Cite this article:

ZHANG Qing-wen,SONG Lin-xu,JI Dao-bin等. Relationship between water quality of Xiangxi River Reservoir and the algal blooms in non-return area in the Three Gorges Reservoir Area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 3018-3026.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/3018

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