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Wei J.,Shandong University | Wei J.,Shandong Provincial Engineering Center on Environmental Science and Technology | Cao P.,The Water Council | Hu W.,Shandong University | And 8 more authors.
Research of Environmental Sciences | Year: 2015

To explore the impacts of the South-to-North Water Diversion Project on the change of planktonic diatom abundance and community in Nansi Lake, the diatom community and water quality were analyzed through monthly sampling from May 2010 to April 2013. The similarity of the diatom community from different sampling sites and seasons was analyzed by non-metric multi-dimensional scaling. Redundancy analysis and Pearson correlation analysis were applied to analyze the relationships between the diatom community and environmental factors. The results showed that the diatom community contained 23 genera and 69 species, and diatom abundance ranged from 14.3×104 to 663.2×104 L-1, being greater in winter and spring than in summer and autumn. The diatom community showed an obvious seasonal succession; Synedra acus was the dominant genus in winter for 15.3% and spring for 24.0%, while Cyclotella comta, which represented warm assemblages, was dominant in summer for 17.8% and autumn for 19.1%. Nitrogen and phosphorus nutrients, pH and temperature were the main environmental factors affecting the change of the diatom community. The diatom community in Nansi Lake showed sensitivity to the change in environmental factors, and is suggested to be monitored over the long term as a potential indicator. ©, 2015, Editorial department of Molecular Catalysis. All right reserved. Source


Pei H.,Shandong University | Pei H.,Research Center on Environmental Science and Engineering | Liu Q.,Shandong University | Hu W.,Research Center on Environmental Science and Engineering | Xie J.,Shandong Environmental Monitoring Central Station
International Journal of Environmental Research | Year: 2011

This study was carried out from June to October 2008 in Nansi Lake. Based on the data collected from five sampling stations, phytoplankton taxonomic composition, abundance, temporal variations and spatial distribution were examined. About 94 species, including 48 species of Chlorophyta, 22 species of Bacillariophyta, and 1 water bloom causative species were identified. Average phytoplankton diversity index and evenness values were 1.59 and 0.58, respectively, revealing moderate biodiversity of phytoplankton biocoenosis. The phytoplankton abundance averaged 1.52×10 7 cells/L, and was much higher than previous investigation carried out in the same months in 1995. The species of Chlorophyta, Bacillariophyta dominated phytoplankton community. The main dominant species were Scenedesmus dimorphus, Chlorella vulgaris, Synedra acus, Aulacoseira granulata, Merismopedia tenuissima and Monallantus brevicylindrus. Concerning nutrient stoichiometry, it was suggested that the higher TN: TP ratio indicated potential P-limitation for phytoplankton growth in Nansi Lake. The environmental conditions of water quality and phytoplankton community composition indicated that Nansi Lake was eutrophic in summer. Source


Tian C.,Shandong University | Pei H.,Shandong University | Pei H.,Shandong Provincial Engineering Center on Environmental Science and Technology | Hu W.,Shandong University | And 2 more authors.
Journal of Environmental Sciences (China) | Year: 2012

Nansi Lake is located on the east line of the South-to-North Water Diversion Project in China. A comprehensive study was carried out to investigate the spatial and temporal distribution of cyanobacteria in the lake from June 2008 to May 2011 based on monthly sample monitoring from five stations. The effect of environmental factors on cyanobacterial abundance was also evaluated. The cyanobacterial community contained 15 genera and 23 species. The cyanobacterial abundance of each monitoring station ranged from 0 to 1.53×107 cells/L with an average of 1.45×106 cells/L, which accounted for 11.66% of the total phytoplankton abundance. The dominant species of cyanobacteria were Pseudanabaena (32.94%) and Merismopedia (19.85%), not the bloom-forming algae such as Microcystis and Anabaena. In addition, the cyanobacterial community structure and water quality variables changed substantially over the survey period. Redundancy analysis (RDA) suggested that temperature and phosphorus were important environmental factors that affected cyanobacteria. Temperature was the most important factor affecting cyanobacterial abundance. The effect of phosphorus on cyanobacterial abundance was more notable in warm periods than in periods with low temperature. © 2012 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences. Source


Lu X.,Shandong University | Tian C.,Shandong University | Tian C.,Shandong Provincial Engineering Center on Environmental Science and Technology | Tian C.,University of Technology, Sydney | And 5 more authors.
Journal of Environmental Sciences (China) | Year: 2013

The present study was conducted to provide a detailed understanding of the variation in cyanobacterial communities of Dongping Lake, which is the final water volume adjusting and storing lake in the east route of the South-to-North Water Diversion Project in China. The spatial and temporal distribution of cyanobacteria was assessed from May 2010 to October 2012 based on monthly samples collected from three stations. Over the 30-month survey, 15 genera and 25 species of cyanobacteria were identified, with cyanobacterial abundance at each monitoring station ranging from undetected to 3.04×107 cells/L, average of 4.27×106 cells/L. The dominant cyanobacterial species were Pseudanabaena limnetica and Aphanizomenon issatschenkoi and not the usual bloom-forming genera such as Microcystis and Anabaena. Cyanobacterial community structure and water quality variables exhibited substantial changes over the period of survey. Redundancy analysis, Pearson correlations, and regression analysis were applied to analyze the relationships among the variables. The results suggested that temperature and chemical oxygen demand were key drivers of the cyanobacterial community composition in Dongping Lake. In addition, the concentration of inorganic nitrogen in the lake had a profound effect on the cyanobacterial abundance as a non-limiting factor in warm periods. © 2013. Source


Tian C.,Shandong University | Lu X.,Shandong University | Pei H.,Shandong University | Hu W.,Research Center on Environmental Science and Engineering | Xie J.,Shandong Environmental Monitoring Central Station
Environmental Monitoring and Assessment | Year: 2013

Dongping Lake is the final adjusting and storing lake in the east route of the South-to-North Water Diversion Project in China, and there has been serious concern regarding the water quality. Understanding the process of phytoplankton variation can be particularly useful in water quality improvement and management decisions. In this study, the phytoplankton taxonomic composition, abundance, temporal variations, spatial distribution, and diversity were studied based on a monthly sampling campaign from three sampling stations between May 2010 and May 2011. A total of 132 species (8 phyla, 72 genera), including 64 species of Chlorophyta, 26 species of Bacillariophyta, 21 species of Cyanophyta, 12 species of Euglenophyta, 3 species of Cryptophyta, 2 species of Xanthophyta, 1 species of Pyrrophyta, and 3 species of Chrysophyta were identified. Average phytoplankton diversity index and evenness values were 3.83 and 0.77, respectively, revealing a high biodiversity of phytoplankton community. The phytoplankton abundance averaged 5.11 × 106 cells/L, with Bacillariophyta dominant in winter and spring, but Cyanophyta in summer and autumn. There were 14 predominant species including Pseudanabaena limnetica, Chlamydomonas simplex, Cyclotella stelligera, and Chroomonas acuta. Phytoplankton community structure and water quality variables changed substantially over the survey period; redundancy analysis, Pearson correlations, and regression analysis as an integrated approach were applied to analyze the relationships among them. Total phosphorus and ammonium played governing roles in the phytoplankton dynamics of Dongping Lake during all periods investigated. © 2012 Springer Science+Business Media B.V. Source

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