Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river

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Hydrosedimentological conditions of floodplain rivers can affect nutrient delivery processes. This study evaluated the effects of sedimentological and hydrological regimes on nitrogen (N) speciation and transport in the floodplain–river system of the Middle Paraná. Relations of sedimentological and...

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Autores principales: Mayora, G., Devercelli, M., Afonso, M.S.
Formato: JOUR
Materias:
Hydrological and sedimentological fluctuations
Middle paraná river
Nitrogen forms
Nitrogen load
Spatial gradient
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_20442041_v7_n4_p461_Mayora
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_20442041_v7_n4_p461_Mayora
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spelling todo:paper_20442041_v7_n4_p461_Mayora2023-10-03T16:38:08Z Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river Mayora, G. Devercelli, M. Afonso, M.S. Hydrological and sedimentological fluctuations Middle paraná river Nitrogen forms Nitrogen load Spatial gradient Hydrosedimentological conditions of floodplain rivers can affect nutrient delivery processes. This study evaluated the effects of sedimentological and hydrological regimes on nitrogen (N) speciation and transport in the floodplain–river system of the Middle Paraná. Relations of sedimentological and hydrological regimes, assessed through turbidity and hydrometric level, with N speciation and concentration were analyzed. Simple linear regressions were performed to assess whether N load changed within the main channel in response to hydrological and sedimentological regimes. From the main channel to the floodplain, dissolved inorganic N decreased; however, the most isolated lake had the highest N concentration, almost totally in organic form. Turbidity was negatively associated with concentrations of nitrate-N (NO3-N), nitrite-N (NO2-N), and dissolved organic N (DON), and relative contributions of these N forms to total N (TN) but was positively correlated to particulate N (PN) and ammonium-N (NH4-N). The hydrometric level was positively associated with DON concentration and its relative contribution at the main channel but negatively associated with DON, PN, and TN concentrations in the most isolated lake. Simple linear regressions showed that the sedimentological regime significantly explained all N forms but not TN load. Flooding increased TN and mainly DON load. The results show that the hydrosedimentological regime largely affects N transport and speciation. The sediment peak incorporates PN to the system and affects dissolved N speciation, probably through effects of suspended particles on redox reactions. The increase of N inputs to the fluvial system during the flood could be caused by DON exportation from the floodplain. © 2017 International Society of Limnology (SIL). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20442041_v7_n4_p461_Mayora
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Hydrological and sedimentological fluctuations
Middle paraná river
Nitrogen forms
Nitrogen load
Spatial gradient
spellingShingle Hydrological and sedimentological fluctuations
Middle paraná river
Nitrogen forms
Nitrogen load
Spatial gradient
Mayora, G.
Devercelli, M.
Afonso, M.S.
Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
topic_facet Hydrological and sedimentological fluctuations
Middle paraná river
Nitrogen forms
Nitrogen load
Spatial gradient
description Hydrosedimentological conditions of floodplain rivers can affect nutrient delivery processes. This study evaluated the effects of sedimentological and hydrological regimes on nitrogen (N) speciation and transport in the floodplain–river system of the Middle Paraná. Relations of sedimentological and hydrological regimes, assessed through turbidity and hydrometric level, with N speciation and concentration were analyzed. Simple linear regressions were performed to assess whether N load changed within the main channel in response to hydrological and sedimentological regimes. From the main channel to the floodplain, dissolved inorganic N decreased; however, the most isolated lake had the highest N concentration, almost totally in organic form. Turbidity was negatively associated with concentrations of nitrate-N (NO3-N), nitrite-N (NO2-N), and dissolved organic N (DON), and relative contributions of these N forms to total N (TN) but was positively correlated to particulate N (PN) and ammonium-N (NH4-N). The hydrometric level was positively associated with DON concentration and its relative contribution at the main channel but negatively associated with DON, PN, and TN concentrations in the most isolated lake. Simple linear regressions showed that the sedimentological regime significantly explained all N forms but not TN load. Flooding increased TN and mainly DON load. The results show that the hydrosedimentological regime largely affects N transport and speciation. The sediment peak incorporates PN to the system and affects dissolved N speciation, probably through effects of suspended particles on redox reactions. The increase of N inputs to the fluvial system during the flood could be caused by DON exportation from the floodplain. © 2017 International Society of Limnology (SIL).
format JOUR
author Mayora, G.
Devercelli, M.
Afonso, M.S.
author_facet Mayora, G.
Devercelli, M.
Afonso, M.S.
author_sort Mayora, G.
title Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
title_short Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
title_full Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
title_fullStr Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
title_full_unstemmed Effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
title_sort effects of the hydrosedimentological regime on nitrogen transport and speciation in a large subtropical floodplain river
url http://hdl.handle.net/20.500.12110/paper_20442041_v7_n4_p461_Mayora
work_keys_str_mv AT mayorag effectsofthehydrosedimentologicalregimeonnitrogentransportandspeciationinalargesubtropicalfloodplainriver
AT devercellim effectsofthehydrosedimentologicalregimeonnitrogentransportandspeciationinalargesubtropicalfloodplainriver
AT afonsoms effectsofthehydrosedimentologicalregimeonnitrogentransportandspeciationinalargesubtropicalfloodplainriver
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