Denitrification and Organic Carbon Availability in Riparian Wetland Soils and Subsurface Sediments

2004 ◽  
Vol 68 (1) ◽  
pp. 320 ◽  
Author(s):  
Alan R. Hill ◽  
Mia Cardaci
Keyword(s):  
Organic Carbon ◽  
Wetland Soils ◽  
Riparian Wetland ◽  
Carbon Availability ◽  
Subsurface Sediments

scholarly journals Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

2013 ◽  
Vol 10 (2) ◽  
pp. 905-916 ◽  
Author(s):  
S. Strohmeier ◽  
K.-H. Knorr ◽  
M. Reichert ◽  
S. Frei ◽  
J. H. Fleckenstein ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
High Frequency ◽  
Groundwater Table ◽  
Wetland Soils ◽  
Short Term ◽  
Fluorescence Excitation ◽  
Riparian Wetland ◽  
Forested Catchment ◽  
Frequency Measurements

Abstract. Concentrations of dissolved organic carbon (DOC) in runoff from catchments are often subject to substantial short-term variations. The aim of this study was to identify the compartmental sources of DOC in a forested catchment and the causes for short-term variations in runoff. Furthermore, we investigated the implication of short-term variations for the calculation of annual runoff fluxes. High frequency measurements (30 min intervals) of DOC in runoff, of discharge and groundwater table were conducted for one year in the 4.2 km2 forested Lehstenbach catchment, Germany. Riparian wetland soils represent about 30% of the catchment area. The quality of DOC was investigated by three dimensional fluorescence excitation-emission matrices in samples taken from runoff, deep groundwater and shallow groundwater from the riparian wetland soils. The concentrations of DOC in runoff were highly variable at an hourly to daily time scale, ranging from 2.6 mg L−1 to 34 mg L−1 with an annual average of 9.2 mg L−1. The concentrations were positively related to discharge, with a counter clockwise hysteresis. Relations of DOC to discharge were steeper and the degree of hysteresis larger in the summer/fall than in the winter/spring period. Dynamics of groundwater table, discharge, DOC concentrations and DOC quality parameters indicated that DOC in runoff originated mainly from the riparian wetland soils, both under low and high flow conditions. The annual export of DOC from the catchment was 84 kg C ha−1 yr−1 when calculated from the high frequency measurements. If the annual export was calculated by simulated samplings of >2 days intervals substantial deviations resulted. Predicted changes in precipitation and discharge patterns as well as generally increasing temperatures likely will cause raising DOC exports from this catchment.

scholarly journals Concentrations and fluxes of dissolved organic carbon in runoff from a forested catchment: insights from high frequency measurements

2012 ◽  
Vol 9 (8) ◽  
pp. 11925-11959 ◽  
Author(s):  
S. Strohmeier ◽  
K.-H. Knorr ◽  
M. Reichert ◽  
S. Frei ◽  
J. H. Fleckenstein ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
High Frequency ◽  
Groundwater Table ◽  
Wetland Soils ◽  
Short Term ◽  
Fluorescence Excitation ◽  
Riparian Wetland ◽  
Forested Catchment ◽  
Frequency Measurements

Abstract. Concentrations of dissolved organic carbon (DOC) in runoff from catchments are often subject to substantial short term variations. The aim of this study was to identify the spatial sources of DOC and the causes for short term variations in runoff from a forested catchment. Furthermore, we investigated the implication of short term variations for the calculation of annual runoff fluxes. High frequency measurements (30 min intervals) of DOC in runoff, of discharge and groundwater table were conducted for one year in the 4.2 km2 forested Lehstenbach catchment, Germany. Riparian wetland soils represent about 30% of the catchment area. The quality of DOC was investigated by three dimensional fluorescence excitation-emission matrices in samples taken from runoff, deep groundwater and shallow groundwater from the riparian wetland soils. The concentrations of DOC in runoff were highly variable at an hourly to daily time scale, ranging from 2.6 mg l−1 to 34 mg l−1 with an annual average of 9.2 mg l−1. The concentrations were positively related to discharge, with a pronounced, counter clockwise hysteresis. Relations of DOC to discharge were steeper in the summer/fall than in the winter/spring season. Dynamics of groundwater table, discharge, DOC concentrations and DOC quality parameters indicated that DOC in runoff originated mainly from the riparian wetland soils, both under low and high flow conditions. The annual export of DOC from the catchment was 84 kg C ha−1 yr−1 when calculated from the high frequency measurements. If the annual export was calculated by simulated random fortnightly samplings, the range was 47 to 124 kg C ha−1 yr−1. Calculations of DOC export fluxes might result in significant errors when based on infrequent (e.g. fortnightly) sampling intervals. Future changes in the precipitation and discharge patterns will influence the DOC dynamics in this catchment, with largest effects in the summer season.

Denitrification potential of nontidal riparian wetland soils in the Virginia Coastal Plain

1996 ◽  
Vol 30 (11) ◽  
pp. 2798-2804 ◽  
Author(s):  
Edelgard W. Pavel ◽  
Raymond B. Reneau ◽  
Duane F. Berry ◽  
Eric P. Smith ◽  
Saied Mostaghimi
Keyword(s):  
Coastal Plain ◽  
Wetland Soils ◽  
Riparian Wetland ◽  
Denitrification Potential

Organic carbon accumulation capability of two typical tidal wetland soils in Chongming Dongtan, China

2011 ◽  
Vol 23 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Shiping Zhang ◽  
Lei Wang ◽  
Jiajun Hu ◽  
Wenquan Zhang ◽  
Xiaohua Fu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Accumulation ◽  
Wetland Soils ◽  
Tidal Wetland

scholarly journals Fractionation of Organic Carbon in Arial Beel Wetland Soils of Bangladesh

2018 ◽  
Vol 14 (2) ◽  
pp. 86-94
Author(s):  
Monera Akter Eva ◽  
Mahmudul Islam Piash ◽  
Md. Faruque Hossain ◽  
Zakia Parveen
Keyword(s):  
Organic Carbon ◽  
Wetland Soils

scholarly journals Copper availability governs nitrous oxide accumulation in wetland soils and stream sediments

2021 ◽  
Author(s):  
Neha Sharma ◽  
Elaine Flynn ◽  
Jeffrey Catalano ◽  
Daniel Giammar
Keyword(s):  
Nitrous Oxide ◽  
Kinetic Model ◽  
Solid Phase ◽  
Stream Sediments ◽  
Microbial Reduction ◽  
Aquatic Systems ◽  
Wetland Soils ◽  
Nitrogen Species ◽  
Riparian Wetland ◽  
Abiotic Reduction

Denitrification is microbially-mediated through enzymes containing metal cofactors. Laboratory studies of pure cultures have highlighted that the availability of Cu, required for the multicopper enzyme nitrous oxide reductase, can limit N2O reduction. However, in natural aquatic systems, such as wetlands and hyporheic zones in stream beds, the role of Cu in controlling denitrification remains incompletely understood. In this study, we collected soils and sediments from three natural environments -- riparian wetlands, marsh wetlands, and a stream -- to investigate their nitrogen species transformation activity at background Cu levels and different supplemented Cu loadings. All of the systems displayed low solid-phase associated Cu (40 - 280 nmol g-1), which made them appropriate sites for evaluating the effect of limited Cu availability on denitrification. In laboratory incubation experiments, high concentrations of N2O accumulated in all microcosms lacking Cu amendment except for one stream sediment sample. With Cu added to provide dissolved concentrations at trace levels (10-300 nM), reduction of N2O to N2 in the wetland soils and stream sediments was enhanced. A kinetic model could account for the trends in nitrogen species by combining the reactions for microbial reduction of NO3- to NO2-/N2O/N2 and abiotic reduction of NO2- to N2. The model revealed that the rate of N2O to N2 conversion increased significantly in the presence of Cu. For riparian wetland soils and stream sediments, the kinetic model also suggested that overall denitrification is driven by abiotic reduction of NO2- in the presence of inorganic electron donors. This study demonstrated that natural aquatic systems containing Cu at concentrations less than or equal to crustal abundances may display incomplete reduction of N2O to N2 that would cause N2O accumulation and release to the atmosphere.

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