scholarly journals Dynamics of dissolved organic carbon after a cyanobacterial bloom in hypereutrophic Lake Taihu (China)

Limnologica ◽  
2011 ◽  
Vol 41 (4) ◽  
pp. 382-388 ◽  
Author(s):  
Linlin Ye ◽  
Xiao Shi ◽  
Xiaodong Wu ◽  
Min Zhang ◽  
Yang Yu ◽  
...  



Limnologica ◽  
2015 ◽  
Vol 54 ◽  
pp. 5-13 ◽  
Author(s):  
Linlin Ye ◽  
Xiaodong Wu ◽  
Bo Liu ◽  
Dezhi Yan ◽  
Fanxiang Kong


2014 ◽  
Vol 60 (10) ◽  
pp. 669-680 ◽  
Author(s):  
Xinghong Pang ◽  
Hong Shen ◽  
Yuan Niu ◽  
Xiaoxue Sun ◽  
Jun Chen ◽  
...  

To clarify the relationships between dissolved organic carbon (DOC) and bacterioplankton community composition (BCC), a 1-year survey (June 2009 – May 2010) was conducted in 3 regions of Lake Taihu (Meiliang Bay, Lake Center, and Eastern Taihu), China. Polymerase chain reaction – denaturing gradient gel electrophoresis was used to analyze the composition and heterogeneity of the bacterioplankton community. Canonical correspondence analysis was used to explore the relationships between DOC concentration and BCC. We found a significant negative correlation between DOC concentration and bacterioplankton community diversity (as measured by the Shannon–Wiener index (H′)). The results show that spatial variation in the bacterioplankton population was stronger than the seasonal variation and that DOC concentration influences BCC in Lake Taihu. DOC concentration, followed by macrophyte biomass, water turbidity, and phytoplankton biomass were the most influential factors that account for BCC changes in Lake Taihu. More detailed studies on the relationship between DOC concentration and BCC should focus on differences in DOC concentrations and quality among these lake regions. DOC had a significant impact on BCC in Meiliang Bay. The relationship between DOC and BCC in the 2 other regions studied (Lake Center and Eastern Taihu) was weaker. The results of this study add to our understanding of the BCC in eutrophic lakes, especially regarding the role of the microbial loop in lake ecosystems.







2021 ◽  
Author(s):  
Ning Ma ◽  
Li Gao ◽  
Zhengkui Ge ◽  
En Hu ◽  
Baozhu Pan ◽  
...  

Abstract The chemical composition of groundwater indicates the water quality and provides useful information for identifying pollution sources. The aim of this study was to explore the effects of dissolved organic matter inputs on the ionic composition of groundwater and identify ions that can be used as indicators of pollution sources. Descriptive statistics, a Piper diagram, a Gibbs plot, major ion ratios, and Pearson’s correlation coefficients were used to analyze the chemical data of 40 groundwater samples collected from the shallow aquifer surrounding Lake Taihu. The results showed that the water quality index values of most sampling points were less than 50 (excellent water quality), except for one point in the southeast direction of the lake basin (good water quality). The dominant hydrochemical type of groundwater was Ca–Mg–HCO3 type, and rock dominance was the major mechanism controlling the groundwater chemistry. With an increasing concentration of dissolved organic carbon, the Na+, Mg2+, and HCO3- concentrations all showed a sharp increase followed by a slow increase, while the NO3– concentration initially decreased sharply and then decreased slowly. The K+ concentration was positively correlated with total dissolved nitrogen and phosphorus, nitrate, As, and Cd concentrations (p < 0.05). The Ca2+, Na+, Mg2+, Cl-, HCO3-, and CO32- concentrations were all positively correlated with Pb concentration (p < 0.001). The results indicated that high organic matter inputs can directly or indirectly change the hydrochemical type of groundwater, and K+ can be used as a tracer ion for the sources of As and Cd in groundwater in the study area.



2021 ◽  
Vol 264 ◽  
pp. 112572
Author(s):  
Dong Liu ◽  
Shujie Yu ◽  
Qitao Xiao ◽  
Tianci Qi ◽  
Hongtao Duan


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