The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective

The influence ofMediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective Riparian zones are considered natural filters of nitrogen (N) within catchments because they can substantially diminish the exports of N from terrestrial to aquatic ecosystems. However,...

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Detalhes bibliográficos
Autores: Lupon Navazo, Anna, Sabater i Comas, Francesc, Bernal Berenguer, Susana
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2017
País:España
Recursos:Universidad de Barcelona
Repositório:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/118846
Acesso em linha:https://hdl.handle.net/2445/118846
Access Level:Acceso aberto
Palavra-chave:Boscos
Riberes
Mediterrània (Regió)
Nitrogen
Forests
Shorelines
Mediterranean Region
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spelling The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspectiveLupon Navazo, AnnaSabater i Comas, FrancescBernal Berenguer, SusanaBoscosRiberesMediterrània (Regió)NitrogenForestsShorelinesMediterranean RegionNitrogenThe influence ofMediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective Riparian zones are considered natural filters of nitrogen (N) within catchments because they can substantially diminish the exports of N from terrestrial to aquatic ecosystems. However, understanding the influence of riparian zones on regulating N exports at the catchment scale still remains a big challenge in ecology, mainly because upscaling plot scale results is difficult, as it is disentangling the effects of riparian, upland, and in-stream processes on stream water chemistry. In this review, we summarize previous studies examining key hydrological and biogeochemical processes by which Mediterranean riparian zones regulate catchment water and N exports.We focus onMediterranean regions because they experience a marked climatic seasonality that facilitates disentangling the close link between climate, riparian hydrology, and stream N exports. We show that Mediterranean riparian soils can be hot spots of N mineralization and nitrification within catchments given their relatively moist conditions and large stocks of N-rich leaf litter. Extremely large nitrification rates can occur during short-time periods (i.e. hot moments) and lead to increases in stream N loads, suggesting that riparian soils can be a potential source of N to adjacent aquatic systems. Moreover, riparian trees can contribute to decrease riparian groundwater level during the vegetative period, and promote reverse fluxes from the stream to the riparian zone. During periods of high hydrological retention, stream water exports to downstream ecosystem decrease, while stream water chemistry is mostly determined by in-stream processes. Riparian tree phenology can also affect catchment N exports by shaping the temporal pattern of both light and litter inputs into the stream. In spring, light enhances in-stream photoautotrophic N uptake before riparian leaf-out, while riparian leaf litter inputs promote in-stream N mineralization in summer and fall. Finally, we illustrate that the impact of Mediterranean riparian zones on stream hydrology and biogeochemistry increases along the stream continuum, and can ultimately influence catchment N exports to downstream ecosystems. Overall, findings gathered in this review question the well-established idea that riparian zones are efficient N buffers, at least for Mediterranean regions, and stress that an integrated view of upland, riparian, and stream ecosystems is essential for advancing our understanding of catchment hydrology and biogeochemistry.Asociación Ibérica de Limnología2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/118846Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.23818/limn.36.18Limnetica, 2017, vol. 36 , num. 2, p. 507-523https://doi.org/10.23818/limn.36.18(c) Lupon Navazo, Anna et al., 2017info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1188462026-05-27T06:46:51Z
dc.title.none.fl_str_mv The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
title The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
spellingShingle The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
Lupon Navazo, Anna
Boscos
Riberes
Mediterrània (Regió)
Nitrogen
Forests
Shorelines
Mediterranean Region
Nitrogen
title_short The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
title_full The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
title_fullStr The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
title_full_unstemmed The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
title_sort The influence of Mediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective
dc.creator.none.fl_str_mv Lupon Navazo, Anna
Sabater i Comas, Francesc
Bernal Berenguer, Susana
author Lupon Navazo, Anna
author_facet Lupon Navazo, Anna
Sabater i Comas, Francesc
Bernal Berenguer, Susana
author_role author
author2 Sabater i Comas, Francesc
Bernal Berenguer, Susana
author2_role author
author
dc.subject.none.fl_str_mv Boscos
Riberes
Mediterrània (Regió)
Nitrogen
Forests
Shorelines
Mediterranean Region
Nitrogen
topic Boscos
Riberes
Mediterrània (Regió)
Nitrogen
Forests
Shorelines
Mediterranean Region
Nitrogen
description The influence ofMediterranean riparian forests on stream nitrogen dynamics: a review from a catchment perspective Riparian zones are considered natural filters of nitrogen (N) within catchments because they can substantially diminish the exports of N from terrestrial to aquatic ecosystems. However, understanding the influence of riparian zones on regulating N exports at the catchment scale still remains a big challenge in ecology, mainly because upscaling plot scale results is difficult, as it is disentangling the effects of riparian, upland, and in-stream processes on stream water chemistry. In this review, we summarize previous studies examining key hydrological and biogeochemical processes by which Mediterranean riparian zones regulate catchment water and N exports.We focus onMediterranean regions because they experience a marked climatic seasonality that facilitates disentangling the close link between climate, riparian hydrology, and stream N exports. We show that Mediterranean riparian soils can be hot spots of N mineralization and nitrification within catchments given their relatively moist conditions and large stocks of N-rich leaf litter. Extremely large nitrification rates can occur during short-time periods (i.e. hot moments) and lead to increases in stream N loads, suggesting that riparian soils can be a potential source of N to adjacent aquatic systems. Moreover, riparian trees can contribute to decrease riparian groundwater level during the vegetative period, and promote reverse fluxes from the stream to the riparian zone. During periods of high hydrological retention, stream water exports to downstream ecosystem decrease, while stream water chemistry is mostly determined by in-stream processes. Riparian tree phenology can also affect catchment N exports by shaping the temporal pattern of both light and litter inputs into the stream. In spring, light enhances in-stream photoautotrophic N uptake before riparian leaf-out, while riparian leaf litter inputs promote in-stream N mineralization in summer and fall. Finally, we illustrate that the impact of Mediterranean riparian zones on stream hydrology and biogeochemistry increases along the stream continuum, and can ultimately influence catchment N exports to downstream ecosystems. Overall, findings gathered in this review question the well-established idea that riparian zones are efficient N buffers, at least for Mediterranean regions, and stress that an integrated view of upland, riparian, and stream ecosystems is essential for advancing our understanding of catchment hydrology and biogeochemistry.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/118846
url https://hdl.handle.net/2445/118846
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.23818/limn.36.18
Limnetica, 2017, vol. 36 , num. 2, p. 507-523
https://doi.org/10.23818/limn.36.18
dc.rights.none.fl_str_mv (c) Lupon Navazo, Anna et al., 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Lupon Navazo, Anna et al., 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Asociación Ibérica de Limnología
publisher.none.fl_str_mv Asociación Ibérica de Limnología
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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