Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest

Nitrogen (N) deposition () drives forest carbon (C) sequestration but the size of this effect is still uncertain. In the field, an estimate of these effects can be obtained by applying mineral N fertilizers over the soil or forest canopy. A 15 N label in the fertilizer can be then used to trace the...

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Autores: Nair, Richard K. F., Perks, Michael P., Mencuccini, Maurizio|||0000-0003-0840-1477
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:216888
Acceso en línea:https://ddd.uab.cat/record/216888
https://dx.doi.org/urn:doi:10.1111/gcb.13450
Access Level:acceso abierto
Palabra clave:15 N-nitrogen
Forest
Isotope trace
Litter decomposition
Litter nitrogen
Nitrogen fertilization
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spelling Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forestNair, Richard K. F.Perks, Michael P.Mencuccini, Maurizio|||0000-0003-0840-147715 N-nitrogenForestIsotope traceLitter decompositionLitter nitrogenNitrogen fertilizationNitrogen (N) deposition () drives forest carbon (C) sequestration but the size of this effect is still uncertain. In the field, an estimate of these effects can be obtained by applying mineral N fertilizers over the soil or forest canopy. A 15 N label in the fertilizer can be then used to trace the movement of the added N into ecosystem pools and deduce a C effect. However, N recycling via litter decomposition provides most of the nutrition for trees, even under heavy inputs. If this recycled litter nitrogen is retained in ecosystem pools differently to added mineral N, then estimates of the effects of on the relative change in C (∆C/∆N) based on short-term isotope-labelled mineral fertilizer additions should be questioned. We used 15 N labelled litter to track decomposed N in the soil system (litter, soils, microbes, and roots) over 18 months in a Sitka spruce plantation and directly compared the fate of this 15 N to an equivalent amount in simulated treatments. By the end of the experiment, three times as much 15 N was retained in the O and A soil layers when N was derived from litter decomposition than from mineral N additions (60% and 20%, respectively), primarily because of increased recovery in the O layer. Roots expressed slightly more 15 N tracer from litter decomposition than from simulated mineral (7.5% and 4.5%) and compared to soil recovery, expressed proportionally more 15 N in the A layer than the O layer, potentially indicating uptake of organic N from decomposition. These results suggest effects of on forest ∆C/∆N may not be apparent from mineral 15 N tracer experiments alone. Given the importance of N recycling, an important but underestimated effect of is its influence on the rate of N release from litter. 22017-01-0120172017-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/216888https://dx.doi.org/urn:doi:10.1111/gcb.13450reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2168882026-06-06T12:50:31Z
dc.title.none.fl_str_mv Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
title Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
spellingShingle Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
Nair, Richard K. F.
15 N-nitrogen
Forest
Isotope trace
Litter decomposition
Litter nitrogen
Nitrogen fertilization
title_short Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
title_full Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
title_fullStr Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
title_full_unstemmed Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
title_sort Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
dc.creator.none.fl_str_mv Nair, Richard K. F.
Perks, Michael P.
Mencuccini, Maurizio|||0000-0003-0840-1477
author Nair, Richard K. F.
author_facet Nair, Richard K. F.
Perks, Michael P.
Mencuccini, Maurizio|||0000-0003-0840-1477
author_role author
author2 Perks, Michael P.
Mencuccini, Maurizio|||0000-0003-0840-1477
author2_role author
author
dc.subject.none.fl_str_mv 15 N-nitrogen
Forest
Isotope trace
Litter decomposition
Litter nitrogen
Nitrogen fertilization
topic 15 N-nitrogen
Forest
Isotope trace
Litter decomposition
Litter nitrogen
Nitrogen fertilization
description Nitrogen (N) deposition () drives forest carbon (C) sequestration but the size of this effect is still uncertain. In the field, an estimate of these effects can be obtained by applying mineral N fertilizers over the soil or forest canopy. A 15 N label in the fertilizer can be then used to trace the movement of the added N into ecosystem pools and deduce a C effect. However, N recycling via litter decomposition provides most of the nutrition for trees, even under heavy inputs. If this recycled litter nitrogen is retained in ecosystem pools differently to added mineral N, then estimates of the effects of on the relative change in C (∆C/∆N) based on short-term isotope-labelled mineral fertilizer additions should be questioned. We used 15 N labelled litter to track decomposed N in the soil system (litter, soils, microbes, and roots) over 18 months in a Sitka spruce plantation and directly compared the fate of this 15 N to an equivalent amount in simulated treatments. By the end of the experiment, three times as much 15 N was retained in the O and A soil layers when N was derived from litter decomposition than from mineral N additions (60% and 20%, respectively), primarily because of increased recovery in the O layer. Roots expressed slightly more 15 N tracer from litter decomposition than from simulated mineral (7.5% and 4.5%) and compared to soil recovery, expressed proportionally more 15 N in the A layer than the O layer, potentially indicating uptake of organic N from decomposition. These results suggest effects of on forest ∆C/∆N may not be apparent from mineral 15 N tracer experiments alone. Given the importance of N recycling, an important but underestimated effect of is its influence on the rate of N release from litter.
publishDate 2017
dc.date.none.fl_str_mv 2
2017-01-01
2017
2017-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/216888
https://dx.doi.org/urn:doi:10.1111/gcb.13450
url https://ddd.uab.cat/record/216888
https://dx.doi.org/urn:doi:10.1111/gcb.13450
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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