The nitrogen cycle in shallow water sediment systems of rice fields. Part 1: The denitrification process

Hydrobiologia ◽  
1988 ◽  
Vol 159 (2) ◽  
pp. 189-202 ◽  
Author(s):  
F. Minzoni ◽  
C. Bonetto ◽  
H. L. Golterman
Keyword(s):  
Shallow Water ◽  
Nitrogen Cycle ◽  
Rice Fields ◽  
Shallow Water Sediment ◽  
Denitrification Process

scholarly journals Tracing the Origin of Groundwater Nitrate in an Area Affected by Acid Rain Using Dual Isotopic Composition of Nitrate

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Tianming Huang ◽  
Zhenbin Li ◽  
Baoqiang Ma ◽  
Yin Long
Keyword(s):  
Isotopic Composition ◽  
Acid Rain ◽  
Nitrogen Cycle ◽  
Soil Nitrogen ◽  
Average Concentration ◽  
Mountainous Area ◽  
Rock Weathering ◽  
High Concentration ◽  
Groundwater System ◽  
Denitrification Process

Acid rain with a relatively high concentration of ammonium and nitrate can accelerate rock weathering. However, its impact on groundwater nitrate is uncertain. This study evaluated the dual isotopic composition of nitrate (δ15N-NO3- and δ18O-NO3-) from precipitation to groundwater in a rural mountainous area affected by acid rain. The average concentration for NH4+ is 1.25 mg/L and NO3- is 2.59 mg/L of acid rain. Groundwater NO3- concentrations ranged from <0.05 to 11.8 mg/L (baseline), and NH4+ concentrations ranged from 0.06 to 0.28 mg/L. The results show that groundwater δ18O-NO3- values (-4.7‰ to +4.2‰) were lower than the values of rainfall δ18O-NO3- (+24.9‰ to +67.3‰), suggesting that rainfall NO3- contributes little to groundwater NO3-. Groundwater δ15N-NO3- values (+0.1‰ to +7.5‰) were higher than the values of δ15N-NO3- derived from the nitrification of rainfall NH4+ (less than -4.7‰ in the study area), suggesting that nitrification of rainfall NH4+ also contributes little to groundwater NO3-. This implies that rainfall NO3- and NH4+ have been utilized. The dual isotopic composition of nitrate shows that baseline groundwater NO3- is derived mainly from nitrification of soil nitrogen. The denitrification process is limited in the groundwater system. This study shows that the rainfall NO3- and NH4+ contribute little to groundwater NO3-, improving the understanding of the nitrogen cycle in areas with a high concentration of NH4+ and NO3- in rainfall.

Shallow water sediment properties derived from high-frequency shear and interface waves

1992 ◽  
Vol 97 (B4) ◽  
pp. 4739 ◽  
Author(s):  
John Ewing ◽  
Jerry A. Carter ◽  
George H. Sutton ◽  
Noel Barstow
Keyword(s):  
Shallow Water ◽  
High Frequency ◽  
Sediment Properties ◽  
Interface Waves ◽  
Shallow Water Sediment

Ensuring very shallow-water sediment properties: case study from Capo Granitola harbour, Sicily (Italy)

2017 ◽  
Vol 38 (3) ◽  
pp. 313-323
Author(s):  
Michele Punzo ◽  
Giuseppe Cavuoto ◽  
Daniela Tarallo ◽  
Vincenzo Di Fiore
Keyword(s):  
Shallow Water ◽  
Sediment Properties ◽  
Shallow Water Sediment

Outer Darwin Harbour shallow water sediment survey 2016: GA0356-post-survey report

2017 ◽  
Author(s):  
L. Radke ◽  
N. Smit ◽  
J. Li ◽  
T. Nicholas ◽  
K. Picard
Keyword(s):  
Shallow Water ◽  
Survey Report ◽  
Shallow Water Sediment

scholarly journals Moderate frequency acoustic penetration of a sandy shallow water sediment

1994 ◽  
Vol 96 (5) ◽  
pp. 3265-3265 ◽  
Author(s):  
Nicholas P. Chotiros ◽  
Åge Kristensen ◽  
Enzo Michelozzi
Keyword(s):  
Shallow Water ◽  
Moderate Frequency ◽  
Acoustic Penetration ◽  
Shallow Water Sediment
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