海洋工程建设对连云港近海环境因子和浮游植物的影响

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Abstract Comprehensive investigations were conducted on the spatial distribution characteristics of chlorophyll a (Chl a), phytoplankton community structure and the environmental factors in the coastal area of Lianyungang in May 2009 (before marine engineering construction) and 2016 (after marine engineering construction), with the purpose of understanding the effects of marine engineering construction on environmental factors and phytoplankton community in this area. The results show that the environmental factors of the studying area changed significantly after engineering construction. An obvious high temperature zone was formed near the inshore area after engineering construction, with 3℃ higher than the offshore area. The nutrient concentrations were significantly decreased, and especially the dissolved silicon (DSi) which reduced by 70%. The concentration of Chl a and the biomass of phytoplankton increased obviously, with the dominant community shifting from diatoms alone to the co-dominant of diatoms and dinoflagellates. The main dominant species before engineering construction (e.g., Coscinodiscus asteromphalus and Noctiluca scientillans) were significantly decreased in 2016, while dominance of Skeletonema costatum was significantly increased. Redundancy analysis (RDA) showed that chemical oxygen demand (COD), dissolved inorganic nitrogen (DIN) and salinity (negative correlation) were the main factors affecting phytoplankton community before marine engineering construction, while the influence of temperature (T) was significantly increased after marine engineering construction. The increase of T, BOD₅ and DO may be the main factors that promoted the increase of phytoplankton in spring.

Key words： marine engineering construction phytoplankton nutrient community structure

Received: 29 January 2021

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X834

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	ZHANG Jing-jing
	Wang Yi-bin
	WANG Ying
	WANG Tian-tian
	Lü Qi-ming
	GAO Yan-jie
	Lü Zhen-bo

Cite this article:

ZHANG Jing-jing,Wang Yi-bin,WANG Ying等. Effects of marine engineering construction on environmental factors and phytoplankton in the coastal area of Lianyungang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4253-4262.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4253

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