scholarly journals Driving Factors and Dynamics of Phytoplankton Community and Functional Groups in an Estuary Reservoir in the Yangtze River, China

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1184 ◽  
Author(s):  
Changtao Yang ◽  
Jing Nan ◽  
Jianhua Li
Keyword(s):  
Water Temperature ◽  
Functional Groups ◽  
Yangtze River ◽  
Light Availability ◽  
Ecological Status ◽  
Water Source ◽  
Driving Factors ◽  
Nutrient Concentrations ◽  
Drinking Water Source ◽  
The Yangtze River

Qingcaosha Reservoir, an estuary reservoir on the Yangtze River and a drinking water source, is facing phytoplankton blooms and the factors driving changes in phytoplankton composition and distribution have not been well understood so far. To facilitate the understanding of this problem, we collected surface water samples from January to December 2014 monthly at 12 sampling sites. A total of 205 taxa classified into eight major taxonomic groups were identified. Cyclotella meneghiniana, Melosira varians, Melosira granulata, Cryptomonas ovata and Chlorella vulgaris were the species dominating at least one season. The long stratification period and high nutrient concentration resulted in high chlorophyll a concentration (36.1 ± 18.5 μg L−1) in the midstream and downstream during summer, and mass phytoplankton growth and sedimentation process led to nutrients decrease. In the reservoir, neither P or N limitation was observed in the study period. We observed that water temperature, nutrient concentrations and light availability (Zeu/Zmix) are critical in selecting functional groups. These results highlight that the functional groups characterized the water body well and showed a good ecological status based on the assemblage index (Q average = 4.0). This work also highlights that mixing regime, water temperature and light availability were the driving factors that determine phytoplankton dynamics.

Risk assessment of organochlorine pesticides in drinking water source of the Yangtze River

2019 ◽  
Vol 182 ◽  
pp. 109390 ◽  
Author(s):  
Xiaoling Jin ◽  
Yan Liu ◽  
Xiaocui Qiao ◽  
Rui Guo ◽  
Chengyou Liu ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Organochlorine Pesticides ◽  
Yangtze River ◽  
Water Source ◽  
Drinking Water Source ◽  
The Yangtze River

scholarly journals Polychlorinated Biphenyls in the Drinking Water Source of the Yangtze River: Characteristics and Risk Assessment

2019 ◽  
Author(s):  
Xiaoai Cui ◽  
Jing Dong ◽  
Zhifeng Huang ◽  
Chengyou Liu ◽  
Xiaocui Qiao ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Polychlorinated Biphenyls ◽  
Yangtze River ◽  
Organic Pollutant ◽  
Water Source ◽  
Potential Ecological Risk ◽  
Drinking Water Source ◽  
The Yangtze River ◽  
Water And Sediment

Abstract Background As the longest river in Asia, the Yangtze River flows through the most industrialized cities in China and provides critical ecological services for agriculture, industry, and transportation. Polychlorinated biphenyls (PCBs) have been banned for many years, but trace amounts of PCBs still exist as persistent organic pollutant in drinking water and are an ecotoxicological problem. In this work, we collected water, sediment, and suspended particulate matter (SPM) samples along the Yangtze River, to study the distribution and transport of PCBs for the risk assessment of the Yangtze River as a drinking water source.Results The ΣPCBs concentrations in water, sediment, and SPM ranged in 0.044–10.98 ng/L, 0.33–69.43 ng/g, and 0.72–152.66 ng/L, respectively. The main pollutants were PCB17, 18, 28, 47 and 118 in the Yangtze River. The ff SW value of PCB18 and PCB28 all exceeded 0.5, whereas the ff SW value of PCB47 and PCB118 (except for PCB118 at Y-4) were less than 0.5. The toxic equivalent quantity (TEQ) range of PCBs in water and in sediment was 0–5.55 pg-TEQ/L and 0–2.51 pg-TEQ/g, respectively.Conclusions In both water and sediment, lower chlorinated PCBs are dominant in the middle reaches and higher chlorinated PCBs are dominant at downstream. In contrast, SPM is dominated by tetra-CBs. The ff SW values reveal a net redissolution of lower PCBs from sediments to water but a net sorption of higher PCBs from water to sediment. The PCBs in water and sediment at downstream pose potential ecological risk, but the drinking water does not have a non-carcinogenic risk for humans.

scholarly journals Polychlorinated Biphenyls in the Drinking Water Source of the Yangtze River: Characteristics and Risk Assessment

2020 ◽  
Author(s):  
Xiaoai Cui ◽  
Jing Dong ◽  
Zhifeng Huang ◽  
Chengyou Liu ◽  
Xiaocui Qiao ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Polychlorinated Biphenyls ◽  
Yangtze River ◽  
Organic Pollutant ◽  
Water Source ◽  
Potential Ecological Risk ◽  
Drinking Water Source ◽  
The Yangtze River ◽  
Water And Sediment

Abstract Background As the longest river in Asia, the Yangtze River flows through the most industrialized cities in China and provides critical ecological services for agriculture, industry, and transportation. Polychlorinated biphenyls (PCBs) have been banned for many years, but trace amounts of PCBs still exist as persistent organic pollutant in drinking water and are an ecotoxicological problem. In this work, we collected water, sediment, and suspended particulate matter (SPM) samples along the Yangtze River, to study the distribution and transport of PCBs for the risk assessment of the Yangtze River as a drinking water source. Results The ΣPCBs concentrations in water, sediment, and SPM ranged in 0.044–10.98 ng/L, 0.33–69.43 ng/g, and 0.72–152.66 ng/L, respectively. The main pollutants were PCB17, 18, 28, 47 and 118 in the Yangtze River. The ff SW value of PCB18 and PCB28 all exceeded 0.5, whereas the ff SW value of PCB47 and PCB118 (except for PCB118 at Y-4) were less than 0.5. The toxic equivalent quantity (TEQ) range of PCBs in water and in sediment was 0–5.55 pg-TEQ/L and 0–2.51 pg-TEQ/g, respectively. Conclusions In both water and sediment, lower chlorinated PCBs are dominant in the middle reaches and higher chlorinated PCBs are dominant at downstream. In contrast, SPM is dominated by tetra-CBs. The ff SW values reveal a net redissolution of lower PCBs from sediments to water but a net sorption of higher PCBs from water to sediment. The PCBs in water and sediment at downstream pose potential ecological risk, but the drinking water does not have a non-carcinogenic risk for humans.

Experimental investigation on water quality standard of Yangtze River water source heat pump

2012 ◽  
Vol 66 (5) ◽  
pp. 1103-1109 ◽  
Author(s):  
Zenghu Qin ◽  
Mingwei Tong ◽  
Lin Kun
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Water ◽  
Heat Pump ◽  
Yangtze River ◽  
Water Source ◽  
Quality Standard ◽  
Heat Pumps ◽  
The Yangtze River ◽  
Water Conditions

Due to the surface water in the upper reaches of Yangtze River in China containing large amounts of silt and algae, high content of microorganisms and suspended solids, the water in Yangtze River cannot be used for cooling a heat pump directly. In this paper, the possibility of using Yangtze River, which goes through Chongqing, a city in southwest China, as a heat source–sink was investigated. Water temperature and quality of the Yangtze River in the Chongqing area were analyzed and the performance of water source heat pump units in different sediment concentrations, turbidity and algae material conditions were tested experimentally, and the water quality standards, in particular surface water conditions, in the Yangtze River region that adapt to energy-efficient heat pumps were also proposed. The experimental results show that the coefficient of performance heat pump falls by 3.73% to the greatest extent, and the fouling resistance of cooling water in the heat exchanger increases up to 25.6% in different water conditions. When the sediment concentration and the turbidity in the river water are no more than 100 g/m3 and 50 NTU respectively, the performance of the heat pump is better, which can be used as a suitable river water quality standard for river water source heat pumps.

Phytoplankton functional groups response to environmental parameters in Muling River basin of northeast China

2019 ◽  
Vol 55 ◽  
pp. 17
Author(s):  
Xu Sun ◽  
Patteson Chula Mwagona ◽  
Isaac Ekyamba Shabani ◽  
Wenjiu Hou ◽  
Xiaoyu Li ◽  
...  
Keyword(s):  
Functional Groups ◽  
River Basin ◽  
Light Availability ◽  
Seasonal Succession ◽  
Environmental Parameters ◽  
N:P Ratio ◽  
Ammonium Nitrogen ◽  
Nutrient Concentrations ◽  
Phytoplankton Functional Groups

The present study was carried out in the biggest tributary of Ussuri River of boundary between China and Russia. The Muling River basin has undergone a long-term dredging works, and waterbody became seriously turbid. The succession of phytoplankton functional groups succession and environmental factors in the river were sampled in 2015. We totally identified 83 species, belonging to 17 functional groups which 5 were predominant, including group F, M, MP, P and Y. The seasonal succession of phytoplankton functional groups was M/P-F/MP/P-MP/P. Results of Spearman correlation analysis and canonical correspondence analysis (CCA) revealed that phytoplankton functional groups were mainly influenced by nutrient concentrations and light availability including total nitrogen (TN), ammonium nitrogen (NH4+–N), nitrate nitrogen (NO3−–N), N:P ratio (N:P), water depth (D) and transparency (SD) in the basin.

Bacterial communities along a 4500-meter elevation gradient in the sediment of the Yangtze River: what are the driving factors?

2020 ◽  
Vol 177 ◽  
pp. 109-130
Author(s):  
Wenlong Zhang ◽  
Haolan Wang ◽  
Yi Li ◽  
Xiaoxiao Zhu ◽  
Lihua Niu ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Yangtze River ◽  
Elevation Gradient ◽  
Driving Factors ◽  
The Yangtze River
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