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| Analysis of the relationship between the distribution of the macrozoobenthos community and nitrogen-phosphorus factors and heavy metals in the Jiaxing river network |
| Received:April 27, 2021 |
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| KeyWord:Jiaxing urban river network;macrobenthos;nitrogen;phosphorus;heavy metal pollution |
| Author Name | Affiliation | E-mail | | HUANG Ziyan | Environmental Analysis and Testing Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Key Laboratory of Water Pollution Control and Wastewater Resource of Anhui Province, College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China | | | DU Shilin | Environmental Analysis and Testing Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | ZHANG Yahui | Environmental Analysis and Testing Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | zhangyahui@craes.org.cn | | ZHANG Jin | Key Laboratory of Water Pollution Control and Wastewater Resource of Anhui Province, College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China | | | MENG Rui | Environmental Analysis and Testing Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | HE Liansheng | Environmental Analysis and Testing Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| This study investigated the distribution characteristics of nitrogen, phosphorus, and heavy metals in water and surface sediments of the Jiaxing river network and the associated response of macrobenthic fauna. Additionally, the seasonal variations of nitrogen, phosphorus, and heavy metals in water and sediment of the Jiaxing river network were analyzed in March(normal season) and July(wet season) of 2019. Based on the benthic survey data of the normal season and wet season, redundancy analysis(RDA) was applied to screen the nitrogen-phosphorus factors and heavy metals(Cr, Cu, Ni, Pb, Zn, Cd, Hg, As) and assess the ecological health of the urban rivers. In total, 18 species of macrobenthos, belonging to 3 phyla, 5 classes, and 14 families, were detected from the survey. There were 9 species of annelids, 6 species of molluscs, and 3 species of arthropods. Bellamya and Limnodrilus hoffmeisteri are widely distributed. The zoobenthos community is characterized by simple structure, low species richness, and high pollution tolerance, and molluscs have the highest density and frequency. RDA showed that total P and total N in surface water[TP(S), TN(S)], and total P in interstitial water[TP(J)] were the main factors influencing the spatial distribution and community structure differences of the benthos. The distribution characteristics of benthos community structure corresponded well with the spatial distribution of water quality indexes. The density of molluscs was higher in the areas with higher nitrogen and phosphorus contents. Correlation analysis between population density and heavy metal content showed that TN(S) in surface water and TP(J) in interstitial water had greater effects on the density of benthos. The Pielou evenness index(J) was significantly positively correlated with TN. Oligochaete density was positively correlated with Hg in the water, and molluscs were positively correlated with Pb in the water. Molluscs were also positively correlated with Ni and Pb in sediments. The Shannon-Wiener diversity index (H'), J, and Margalef richness index(d) were negatively correlated with the heavy metal content in sediments. Therefore, the community structure and spatial distribution of zoobenthos have good correlations with nitrogen, phosphorus, and heavy metals, which can provide a basis for the restoration and management of macrozoobenthos in the Jiaxing river network. |
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