Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis

Detalhes bibliográficos
Autor(a) principal: Pinto, Renata
Data de Publicação: 2021
Outros Autores: Weigelhofer, Gabriele, Brito, Antonio Guerreiro De, Hein, Thomas
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/21361
Resumo: Background. Sediments frequently exposed to dry-wet cycles are potential biogeochemical hotspots for greenhouse gas (GHG) emissions during dry, wet and transitional phases. While the effects of drying and rewetting on carbon fluxes have been studied extensively in terrestrial and aquatic systems, less is known about the effects of dry-wet cycles on N2O emissions from aquatic systems. As a notable part of lotic systems are temporary, and small lentic systems can substantially contribute to GHG emissions, dry-wet cycles in these ecosystems can play a major role on N2O emissions. Methodology. This study compiles literature focusing on the effects of drying, rewetting, flooding, and water level fluctuations on N2O emissions and related biogeochemical processes in sediments of lentic and lotic ecosystems. Results. N2O pulses were observed following sediment drying and rewetting events. Moreover, exposed sediments during dry phases can be active spots for N2O emissions. The general mechanisms behind N2O emissions during dry-wet cycles are comparable to those of soils and are mainly related to physical mechanisms and enhanced microbial processing in lotic and lentic systems. Physical processes driving N2O emissions are mainly regulated by water fluctuations in the sediment. The period of enhanced microbial activity is driven by increased nutrient availability. Higher processing rates and N2O fluxes have been mainly observed when nitrification and denitrification are coupled, under conditions largely determined by O2 availability. Conclusions. The studies evidence the driving role of dry-wet cycles leading to temporarily high N2O emissions in sediments from a wide array of aquatic habitats. Peak fluxes appear to be of short duration, however, their relevance for global emission estimates as well as N2O emissions from dry inland waters has not been quantified. Future research should address the temporal development during drying-rewetting phases in more detail, capturing rapid flux changes at early stages, and further explore the functional impacts of the frequency and intensity of dry-wet cycles
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spelling Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesisaquatic-terrestrial interfaceintermittentinland watersloticlenticdroughtfloodingBackground. Sediments frequently exposed to dry-wet cycles are potential biogeochemical hotspots for greenhouse gas (GHG) emissions during dry, wet and transitional phases. While the effects of drying and rewetting on carbon fluxes have been studied extensively in terrestrial and aquatic systems, less is known about the effects of dry-wet cycles on N2O emissions from aquatic systems. As a notable part of lotic systems are temporary, and small lentic systems can substantially contribute to GHG emissions, dry-wet cycles in these ecosystems can play a major role on N2O emissions. Methodology. This study compiles literature focusing on the effects of drying, rewetting, flooding, and water level fluctuations on N2O emissions and related biogeochemical processes in sediments of lentic and lotic ecosystems. Results. N2O pulses were observed following sediment drying and rewetting events. Moreover, exposed sediments during dry phases can be active spots for N2O emissions. The general mechanisms behind N2O emissions during dry-wet cycles are comparable to those of soils and are mainly related to physical mechanisms and enhanced microbial processing in lotic and lentic systems. Physical processes driving N2O emissions are mainly regulated by water fluctuations in the sediment. The period of enhanced microbial activity is driven by increased nutrient availability. Higher processing rates and N2O fluxes have been mainly observed when nitrification and denitrification are coupled, under conditions largely determined by O2 availability. Conclusions. The studies evidence the driving role of dry-wet cycles leading to temporarily high N2O emissions in sediments from a wide array of aquatic habitats. Peak fluxes appear to be of short duration, however, their relevance for global emission estimates as well as N2O emissions from dry inland waters has not been quantified. Future research should address the temporal development during drying-rewetting phases in more detail, capturing rapid flux changes at early stages, and further explore the functional impacts of the frequency and intensity of dry-wet cyclesPeerjRepositório da Universidade de LisboaPinto, RenataWeigelhofer, GabrieleBrito, Antonio Guerreiro DeHein, Thomas2021-05-27T08:42:20Z20212021-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/21361engPinto R, Weigelhofer G, Brito AG, Hein T. 2021. Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis. PeerJ 9:e10767http://doi.org/10.7717/peerj.10767info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:50:48Zoai:www.repository.utl.pt:10400.5/21361Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:05:57.747074Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
title Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
spellingShingle Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
Pinto, Renata
aquatic-terrestrial interface
intermittent
inland waters
lotic
lentic
drought
flooding
title_short Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
title_full Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
title_fullStr Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
title_full_unstemmed Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
title_sort Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis
author Pinto, Renata
author_facet Pinto, Renata
Weigelhofer, Gabriele
Brito, Antonio Guerreiro De
Hein, Thomas
author_role author
author2 Weigelhofer, Gabriele
Brito, Antonio Guerreiro De
Hein, Thomas
author2_role author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Pinto, Renata
Weigelhofer, Gabriele
Brito, Antonio Guerreiro De
Hein, Thomas
dc.subject.por.fl_str_mv aquatic-terrestrial interface
intermittent
inland waters
lotic
lentic
drought
flooding
topic aquatic-terrestrial interface
intermittent
inland waters
lotic
lentic
drought
flooding
description Background. Sediments frequently exposed to dry-wet cycles are potential biogeochemical hotspots for greenhouse gas (GHG) emissions during dry, wet and transitional phases. While the effects of drying and rewetting on carbon fluxes have been studied extensively in terrestrial and aquatic systems, less is known about the effects of dry-wet cycles on N2O emissions from aquatic systems. As a notable part of lotic systems are temporary, and small lentic systems can substantially contribute to GHG emissions, dry-wet cycles in these ecosystems can play a major role on N2O emissions. Methodology. This study compiles literature focusing on the effects of drying, rewetting, flooding, and water level fluctuations on N2O emissions and related biogeochemical processes in sediments of lentic and lotic ecosystems. Results. N2O pulses were observed following sediment drying and rewetting events. Moreover, exposed sediments during dry phases can be active spots for N2O emissions. The general mechanisms behind N2O emissions during dry-wet cycles are comparable to those of soils and are mainly related to physical mechanisms and enhanced microbial processing in lotic and lentic systems. Physical processes driving N2O emissions are mainly regulated by water fluctuations in the sediment. The period of enhanced microbial activity is driven by increased nutrient availability. Higher processing rates and N2O fluxes have been mainly observed when nitrification and denitrification are coupled, under conditions largely determined by O2 availability. Conclusions. The studies evidence the driving role of dry-wet cycles leading to temporarily high N2O emissions in sediments from a wide array of aquatic habitats. Peak fluxes appear to be of short duration, however, their relevance for global emission estimates as well as N2O emissions from dry inland waters has not been quantified. Future research should address the temporal development during drying-rewetting phases in more detail, capturing rapid flux changes at early stages, and further explore the functional impacts of the frequency and intensity of dry-wet cycles
publishDate 2021
dc.date.none.fl_str_mv 2021-05-27T08:42:20Z
2021
2021-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/21361
url http://hdl.handle.net/10400.5/21361
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Pinto R, Weigelhofer G, Brito AG, Hein T. 2021. Effects of dry-wet cycles on nitrous oxide emissions in freshwater sediments: a synthesis. PeerJ 9:e10767
http://doi.org/10.7717/peerj.10767
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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