scholarly journals Migration Mechanism of Biogenic Elements and Their Quantification on the Sediment-water Interface of Lake Taihu: I.Spatial Variation of the Ammonium Release Rates and Its Source and Sink Fluxes

2004 ◽  
Vol 16 (1) ◽  
pp. 11-21 ◽  
Author(s):  
FAN Chengxin ◽  
◽  
ZHANG Lu ◽  
QIN Boqiang ◽  
HU Weiping ◽  
...  
Keyword(s):  
Lake Taihu ◽  
Biogenic Elements ◽  
Water Interface ◽  
Release Rates ◽  
Migration Mechanism ◽  
Source And Sink

Dredging method effects on sediment resuspension and nutrient release across the sediment-water interface in Lake Taihu, China

2019 ◽  
Vol 27 (21) ◽  
pp. 25861-25869 ◽  
Author(s):  
Chao Chen ◽  
Ming Kong ◽  
Yi-Yao Wang ◽  
Qiu-Shi Shen ◽  
Ji-Cheng Zhong ◽  
...  
Keyword(s):  
Lake Taihu ◽  
Sediment Resuspension ◽  
Nutrient Release ◽  
Water Interface ◽  
Method Effects

scholarly journals On the potential release rates of nutrient from internal sources: A comparative study of typical dredged and un-dredged areas, northwestern Lake Taihu

2014 ◽  
Vol 26 (6) ◽  
pp. 829-836
Author(s):  
CHEN Chao ◽  
◽  
ZHONG Jicheng ◽  
SHAO Shiguang ◽  
LIU Cheng ◽  
...  
Keyword(s):  
Comparative Study ◽  
Lake Taihu ◽  
Release Rates ◽  
Internal Sources

Phosphite flux at the sediment–water interface in northern Lake Taihu

2016 ◽  
Vol 543 ◽  
pp. 67-74 ◽  
Author(s):  
Huimin Qiu ◽  
Jinju Geng ◽  
Hongqiang Ren ◽  
Zhaoyi Xu
Keyword(s):  
Lake Taihu ◽  
Water Interface

Evaluation of in situ simulated dredging to reduce internal nitrogen flux across the sediment-water interface in Lake Taihu, China

2016 ◽  
Vol 214 ◽  
pp. 866-877 ◽  
Author(s):  
Juhua Yu ◽  
Chengxin Fan ◽  
Jicheng Zhong ◽  
Yinlong Zhang ◽  
Changhui Wang ◽  
...  
Keyword(s):  
Lake Taihu ◽  
Water Interface ◽  
Nitrogen Flux

scholarly journals Environmental characteristics of sediment-water interface of phytoplankton and macrophyte dominated zones in Lake Taihu

2013 ◽  
Vol 25 (2) ◽  
pp. 199-208 ◽  
Author(s):  
WANG Yongping ◽  
◽  
ZHU Guangwei ◽  
HONG Dalin ◽  
QIN Boqiang
Keyword(s):  
Lake Taihu ◽  
Water Interface ◽  
Environmental Characteristics

224Ra/228Th disequilibrium in sediments of Lake Taihu: Implications of nitrogen fluxes across the sediment–water interface

2020 ◽  
Author(s):  
Xiaoyan shi ◽  
Xin luo ◽  
Jimmy.Jiu jiao ◽  
Jing huang ◽  
Meiqing lu ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Molecular Diffusion ◽  
Lake Taihu ◽  
Inorganic Nitrogen ◽  
Eastern China ◽  
Water Remediation ◽  
Water Interface ◽  
Benthic Fluxes ◽  
Eutrophic Lakes ◽  
Nitrogen Fluxes

<p>Radium-224 /Thorium-228 (<sup>224</sup>Ra/<sup>228</sup>Th) disequilibrium in sediments is an advanced proxy of benthic processes and has been gradually used to quantify the fluxes and solute transfer across the sediment–water interface (SWI). This study makes the first attempt to explore the nitrogen fluxes across the SWI of Lake Taihu, the third largest and highly eutrophic freshwater lake in eastern China, based on the plumbing of <sup>224</sup>Ra/<sup>228</sup>Th disequilibrium in the lake sediments. The microscopic sediment cores (0-20 cm) were collected in different parts of the lake, and exchangeable <sup>224</sup>Ra and <sup>228</sup>Th in bulk sediments were measured. Dissolved inorganic nitrogen (DIN) in pore water and overlying lake water were also analyzed. Deficits of <sup>224</sup>Ra compared to its parent isotopes <sup>228</sup>Th were observed in the lake sediments, suggesting the influences of mixing processes. The deficits were relatively significant in the western and northern parts, which are consistent with the relative high-eutrophicated areas of the lake. One-dimensional (1D) radium-thorium diagenetic model in the sediment was used to estimate the benthic fluxes based on the <sup>224</sup>Ra deficits. Results show that the benthic fluxes of <sup>224</sup>Ra varied from -0.428 to 1.170 dpm cm<sup>-2</sup> d<sup>-1</sup>, and the bio-irrigation and molecular diffusion are considered to be the major factors. Specifically, in the severely eutrophicated area of the lake, the bio-irrigation predominates in benthic fluxes, reaching up to 97.1% of the deficit of <sup>224</sup>Ra. The DIN benthic fluxes were also quantified, leading to a flux estimation of 3.41 mol m<sup>-2</sup> d<sup>-1</sup>, which exceeds riverine input (2.63 mol m<sup>-2</sup> d<sup>-1</sup>) and the loading derived from lacustrine groundwater discharge (0.02~0.03 mol m<sup>-2</sup> d<sup>-1</sup>). This study reveals that sediment processes could be the vital factors for the lake nutrient loadings, and highly contribute to the lake eutrophication. This study is constructive for the water remediation and ecosystem restoration in Lake Taihu and other large eutrophic lakes elsewhere.</p>

Seasonality in phosphorus release rates from the sediments of a hypereutrophic lake under a matrix of pH and redox conditions

2000 ◽  
Vol 57 (5) ◽  
pp. 1033-1041 ◽  
Author(s):  
Michael R Penn ◽  
Martin T Auer ◽  
Susan M Doerr ◽  
Charles T Driscoll ◽  
Carol M Brooks ◽  
...  
Keyword(s):  
Average Rate ◽  
Sediment Cores ◽  
Redox Status ◽  
Phosphorus Release ◽  
Water Interface ◽  
Concentration Gradients ◽  
Release Rates ◽  
Release Process ◽  
P Release

Phosphorus release rates were measured on intact sediment cores collected from the major depositional basin of Onondaga Lake, a dimictic, calcareous, hypereutrophic system in Syracuse, N.Y., U.S.A. Release experiments were conducted under a matrix of redox and pH conditions to investigate the importance of Ca- and Fe-related physicochemistry on sediment cores collected seasonally, i.e., during the spring, summer, fall, and winter periods. Strong seasonal variation in P release was observed, with rates ranging from ~3 to 38 mg P·m-2·day-1. This variation is attributed to changes in redox status and P concentration gradients at the sediment-water interface. An oxidized microlayer at the sediment-water interface partially inhibits sediment P release under isothermal, well-mixed conditions in the spring and fall. Phosphorus trapped in the oxic microlayer (sorption) is freed when the microlayer is chemically reduced at the onset of anoxia and high P release rates are observed. The oxidized microlayer serves to regulate seasonality in rates of sediment P release but does not influence long-term sediment-water exchange. It is proposed that the long-term P release process is best represented by a time-weighted annual average rate, calculated here to be ~10 mg P·m-2·day-1.

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