The role of salinity in shaping dissolved inorganic nitrogen and N2O dynamics in estuarine sediment–water interface

2013 ◽  
Vol 66 (1-2) ◽  
pp. 225-229 ◽  
Author(s):  
Catarina Teixeira ◽  
Catarina Magalhães ◽  
Samantha B. Joye ◽  
Adriano A. Bordalo
Keyword(s):  
Inorganic Nitrogen ◽  
Estuarine Sediment ◽  
Water Interface ◽  
Dissolved Inorganic Nitrogen

Dissolved Inorganic Nitrogen Fluxes at Sediment-Water Interface in Yangtze Estuarine Tidal Flat

2013 ◽  
Vol 726-731 ◽  
pp. 288-295 ◽  
Author(s):  
Huan Guang Deng ◽  
Dong Qi Wang ◽  
Zhen Lou Chen
Keyword(s):  
Tidal Flat ◽  
Environmental Gradients ◽  
Inorganic Nitrogen ◽  
Yangtze Estuary ◽  
Water Interface ◽  
Dissolved Inorganic Nitrogen ◽  
Overlying Water ◽  
Spatial Differences ◽  
Estuary Sediment ◽  
Temporal And Spatial

Yangtze estuary data, collected over three years, indicates that the temporal and spatial distributions of the environmental gradients reflect complicated seasonal changes and spatial differences in the exchange flux of the dissolved inorganic nitrogen (DIN= NH4++ NO3-+ NO2-) across the sediment-water interface. Overall in northern sites of Yangtze estuary, sediment was a source of ammonium (NH4+) (-3.67~10.65 mmol·m-2·d-1) probably because of higher salinities. Sediment was a sink for NH4+ in southern sites (-18.45~3.33 mmol·m-2·d-1) during most years. The exchange behavior of nitrate (NO3-) showed temporal and spatial variation from the upper to lower estuary and ranged from-32.8 mmol·m-2·d-1 to 35.8 mmol·m-2·d-1. The interface exchange direction of ammonium was affected by NH4+ concentration, but the relationship between NO3- concentration and the direction of flux was not obvious. The concentration of nitrite (NO2-) was very low and its interface flux was not related to DIN concentration. Overall, the sediment of Yangtze Estuarine tidal flat was a source of DIN to overlying water in the spring, but a sink for DIN during the other three seasons of the year.

scholarly journals Regeneration of inorganic nutrient in sediment water interface by Pseudomonas perfectomarina

2013 ◽  
Vol 22 (1) ◽  
pp. 21-28
Author(s):  
Md Abdul Karim ◽  
Kimio Fukami
Keyword(s):  
Inorganic Nitrogen ◽  
Experimental System ◽  
Inorganic Phosphorus ◽  
Inorganic Nutrient ◽  
Water Interface ◽  
Bacterial Cells ◽  
Dissolved Inorganic Nitrogen ◽  
Different Temperatures ◽  
Inorganic Phosphorous ◽  
Porous Substrates

Pseudomonas perfectomarina was isolated from a eutrophic bottom environment and introduced to stimulate heterotrophic and decomposing activities. The bacterial cells re-suspension was added to the experimental system after absorbing with porous substrates. The strain enhanced net regeneration of dissolved inorganic nitrogen and inorganic phosphorus from the sediment by two to fivefolds at different temperatures. The bacteria P. perfectomarina enhance net regeneration of 83.20, 148.08, 127.58 and 193.31 μM dissolved inorganic nitrogen and 14.12, 13.24, 14.43 and 23.21 μM dissolved inorganic phosphorous from the sediment at 20, 23, 24 and 26ºC, respectively. Results suggested that the application of P. perfectomarina with substrates would be promising for improvement of eutrophic sediment water interface during summer. Dhaka Univ. J. Biol. Sci. 22(1): 21-28, 2013 (January)

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