Dissolved organic N in shallow tropical lakes and reservoirs: Contribution to total dissolved N and relationships with eutrophication

2019 ◽  
Vol 104 (5-6) ◽  
pp. 106-115 ◽  
Author(s):  
Iola Gonçalves Boëchat ◽  
Aparecida Beatriz das Mercês Paiva-Magela ◽  
Helbert Rocha Reis ◽  
Björn Gücker
Keyword(s):  
Tropical Lakes ◽  
Organic N ◽  
Lakes And Reservoirs ◽  
Dissolved Organic N

The relationship between inorganic and organic nutrients in sea water

1979 ◽  
Vol 59 (1) ◽  
pp. 239-250 ◽  
Author(s):  
E. I. Butler ◽  
Susan Knox ◽  
M. I. Liddicoat
Keyword(s):  
Seasonal Variations ◽  
Sea Water ◽  
Organic N ◽  
English Channel ◽  
Organic Nutrients ◽  
Dissolved Organic N ◽  
The Relationship ◽  
Inorganic And Organic

The seasonal variations of dissolved inorganic and organic N and P in the waters of the English Channel during an 11-year study are discussed. The N results show that as NO3 is utilized by phytoplankton there is an increase in the concentration of the dissolved organic N fraction and there are always significant amounts of dissolved N in some form in the water.

scholarly journals Spatial and Temporal Hydrochemical Variation of a Third Order River Network in a Quasi Pristine Coastal Watershed, at Southern Bahia, Brazil

2013 ◽  
Vol 85 (4) ◽  
pp. 1357-1370 ◽  
Author(s):  
ELLY R.S. DE SOUZA ◽  
FRANCISCO C.F. DE PAULA
Keyword(s):  
Dissolved Oxygen ◽  
Electric Conductivity ◽  
Fecal Coliforms ◽  
Organic N ◽  
Third Order ◽  
Total N ◽  
Coastal Watershed ◽  
Southern Bahia ◽  
Hydrochemical Variation ◽  
Dissolved Organic N

ABSTRACT Rio da Serra watershed presents well preserved fragments of rain forest at the headwaters and small farms at middle and final stretches. These features allowed the study of fluvial hydrochemistry, under quasi pristine conditions. Sampling stations were established in order to represent the basin, and visited during dry, intermediate and wet periods. Obtained results are: temperature (22.1 – 28.6 °C); electric conductivity (34 – 52 µS/cm); dissolved oxygen (35 – 110%); pH (3.8 – 7.7); total suspended solids (1.1 – 20 mg/L); chlorophyll (1.0 – 9.2 µg/L); total N (74 – 580 µmol/L); particulate N (60 – 550 µmol/L); N-NO3 (0.1 – 9.3 µmol/L); dissolved organic N (4 -70 µmol/L); total phosphorous (5.3 – 47 µmol/L); particulate P (4.4 – 59 µmol/L); P-PO4 (0.1 – 0.7 µmol/L); dissolved organic P (0.01 – 2.0 µmol/L); silicate (30 -90 µmol/L); fecal coliforms (80 – 700 CFU/100mL). In seasonal terms dissolved oxygen, electric conductivity, nitrate and silicate concentrations were higher during the dry, whereas TSS was higher during the wet period. Seasonal differences of dissolved oxygen, temperature, pH and nitrate were also detected near wetlands areas. Along the basin results showed a distinction between headwaters and other sections, revealing a control of fluvial hydrochemistry by the preserved area, mostly for the dissolved organic N and P species and phosphate.

scholarly journals TERRESTRIAL C SEQUESTRATION AT ELEVATED CO2AND TEMPERATURE: THE ROLE OF DISSOLVED ORGANIC N LOSS

2005 ◽  
Vol 15 (1) ◽  
pp. 71-86 ◽  
Author(s):  
Edward B. Rastetter ◽  
Steven S. Perakis ◽  
Gaius R. Shaver ◽  
Göran I. Ågren
Keyword(s):  
C Sequestration ◽  
Organic N ◽  
N Loss ◽  
Dissolved Organic N

scholarly journals Hydrodynamic and ecological 3D modeling in tropical lakes

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Lais F. Amorim ◽  
José Rodolfo Scarati Martins ◽  
Fabio F. Nogueira ◽  
Fabio P. Silva ◽  
Bárbara P. S. Duarte ◽  
...  
Keyword(s):  
Water Quality ◽  
High Frequency ◽  
3D Model ◽  
3D Models ◽  
Tropical Lakes ◽  
Hydrodynamic Behavior ◽  
Frequency Monitoring ◽  
Lakes And Reservoirs ◽  
Bed Material ◽  
Good Agreement

AbstractConservation and improvement of water quality in water bodies is an important matter to maintain all of its uses as well as other human necessities like microclimate regulation and leisure. Lakes and reservoirs have a complex circulation behavior with vertical temperature profiles changes along the time, resulting in differences in water density and a vertical stratification condition. This characteristic can directly affect the water quality conditions perturbing its main indicators. This study aims to evaluate the quasi-3D models' capacity to represent the hydrodynamic behavior of a tropical lake and its effects on the main variables that characterize its water quality. To achieve this objective, high-frequency monitoring data were collected, the lake was represented in a quasi-3D model, and the accuracy of the result was evaluated by applying statistical indices. The evaluation showed good agreement between field measures and simulated results when compared with other applications. The connections between hydrodynamic behavior and water quality were seen with the simulations results analysis, which showed that mixing events and long stratification periods perturb the water quality, the first with re-suspended bed material and the second blocking the surface and bottom exchanges. The application of a 3D model gives the capacity to reproduce the reservoir spatial variability and its vertical profiles, which is necessary to study the constituents' distributions across the water column. Therefore, the hydrodynamic and water quality behavior of lakes was accurately represented by the model, as well as the importance of improving high-frequency monitoring techniques.

The dynamics of dissolved organic N in the fumigated soils

2011 ◽  
Vol 47 (7) ◽  
pp. 833-837 ◽  
Author(s):  
Chenglei Zhang ◽  
Guitong Li ◽  
Qimei Lin ◽  
Aocheng Cao ◽  
Xiaorong Zhao
Keyword(s):  
Organic N ◽  
Dissolved Organic N
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