Journal of Dalian Ocean University  2023, Vol. 38 Issue (6): 1020-1031 DOI: 10.16535/j.cnki.dlhyxb.2023-084 |
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| Phytoplankton community structure, functional groups and their relationship with environmental factors in Dongguan Ecological Park |
| ZHAO Junhui，WANG Yang，WANG Yakun，WU Pengju，HUANG Na，CHEN Liping，LIU Qigen，HU Zhongjun*
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| 1.Centre for Research on Environmental Ecology and Fish Nutrition，Ministry of Agriculture and Rural Affairs，Shanghai Ocean University，Shanghai 201306，China；2.Key Laboratory of Freshwater Aquatic Germplasm Resources，Ministry of Agriculture and Rural Affairs，Shanghai Ocean University，Shanghai 201306，China；3.Jiangsu Yunian Agriculture and Forestry Ecological Development Company Limited，Changzhou 213000，China；4.Dongguan Ecological Environmental Protection Research Institute Company Limited，Dongguan 523000，China；5.Water Engineering Construction and Operation Center of Dongguan Songshan Lake Hi-Tec Industrial Development Zone，Dongguan 523000，China |
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Abstract To investigate the structural characteristics of phytoplankton communities, functional groups and their relationship with environmental factors in Dongguan Urban Wetland Park, the phytoplankton community structure and environmental factors in the water environment were quarterly investigated at 7 sites in the Central Islands and Moon Lake of Dongguan Ecological Park from April to December 2019 by the traditional classification method, functional group classification method and comprehensive nutrient status index method. The results showed that 137 species (genera) of phytoplankton were identified in Dongguan Ecological Park, with the most species number in Chlorophyta and all the dominant species in Cyanophyta throughout the year. There were annual average phytoplankton abundance of (16.83±1.97)×107 ind./L and biomass of (23.00±3.00) mg/L, with significant differences in abundance and biomass among seasons (P<0.05), and significant differences between seasons and lake areas (P<0.05). Cluster analysis (CA) showed that there were significant changes in the composition of phytoplankton species between seasons (P<0.05). Phytoplankton in Dongguan Ecological Park was divided into 24 functional groups, with dominant functional groups D, F, H1, J, Lo, MP, P, S1, SN, W1, X1 and Y, and seasonal changes. Redundancy analysis (RDA) revealed that water temperature (WT),  ammonia nitrogen (NH+4-N), pH and total phosphorus (TP) were the main environmental factor affecting the dominant phytoplankton species and functional groups. A comprehensive analysis of the water quality evaluation by single factor evaluation method, trophic level index (TLI), functional group Q index, phytoplankton standing crop, chlorophyll-a and phytoplankton diversity indices showed that Dongguan Ecological Park was in a moderately eutrophic or polluted state, with severe organic pollution and nitrogen as the main pollutant. The phytoplankton community in Dongguan Ecological Park was shown to be dominated by Cyanophyta, and the water environment to be in a moderately eutrophic or moderately polluted state. It is necessary to strictly control external pollution and strengthen the water purification capacity of the water itself.
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Published: 18 January 2024
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