Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness

Abstract Models predict that vertical gradients of foliar nitrogen (N) allocation, increasing from bottom to top of plant canopies, emerge as a plastic response to optimise N utilisation for carbon assimilation. While this mechanism has been well documented in monocultures, its relevance for mixed s...

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Autores principales:	Alexandru Milcu, Arthur Gessler, Christiane Roscher, Laura Rose, Zachary Kayler, Dörte Bachmann, Karin Pirhofer-Walzl, Saša Zavadlav, Lucia Galiano, Tina Buchmann, Michael Scherer-Lorenzen, Jacques Roy
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ffe70475fe654933a965270fe48531c7
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spelling	oai:doaj.org-article:ffe70475fe654933a965270fe48531c72021-12-02T11:40:20ZTop canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness10.1038/s41598-017-08819-92045-2322https://doaj.org/article/ffe70475fe654933a965270fe48531c72017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08819-9https://doaj.org/toc/2045-2322Abstract Models predict that vertical gradients of foliar nitrogen (N) allocation, increasing from bottom to top of plant canopies, emerge as a plastic response to optimise N utilisation for carbon assimilation. While this mechanism has been well documented in monocultures, its relevance for mixed stands of varying species richness remains poorly understood. We used 21 naturally assembled grassland communities to analyse the gradients of N in the canopy using N allocation coefficients (K N ) estimated from the distribution of N per foliar surface area (KN-F) and ground surface area (KN-G). We tested whether: 1) increasing plant species richness leads to more pronounced N gradients as indicated by higher K N -values, 2) K N is a good predictor of instantaneous net ecosystem CO2 exchange and 3) functional diversity of leaf N concentration as estimated by Rao’s Q quadratic diversity metric is a good proxy of K N . Our results show a negative (for KN-G) or no relationship (for KN-F) between species richness and canopy N distribution, but emphasize a link (positive relationship) between more foliar N per ground surface area in the upper layers of the canopy (i.e. under higher KN-G) and ecosystem CO2 uptake. Rao’s Q was not a good proxy for either K N .Alexandru MilcuArthur GesslerChristiane RoscherLaura RoseZachary KaylerDörte BachmannKarin Pirhofer-WalzlSaša ZavadlavLucia GalianoTina BuchmannMichael Scherer-LorenzenJacques RoyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexandru Milcu Arthur Gessler Christiane Roscher Laura Rose Zachary Kayler Dörte Bachmann Karin Pirhofer-Walzl Saša Zavadlav Lucia Galiano Tina Buchmann Michael Scherer-Lorenzen Jacques Roy Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
description	Abstract Models predict that vertical gradients of foliar nitrogen (N) allocation, increasing from bottom to top of plant canopies, emerge as a plastic response to optimise N utilisation for carbon assimilation. While this mechanism has been well documented in monocultures, its relevance for mixed stands of varying species richness remains poorly understood. We used 21 naturally assembled grassland communities to analyse the gradients of N in the canopy using N allocation coefficients (K N ) estimated from the distribution of N per foliar surface area (KN-F) and ground surface area (KN-G). We tested whether: 1) increasing plant species richness leads to more pronounced N gradients as indicated by higher K N -values, 2) K N is a good predictor of instantaneous net ecosystem CO2 exchange and 3) functional diversity of leaf N concentration as estimated by Rao’s Q quadratic diversity metric is a good proxy of K N . Our results show a negative (for KN-G) or no relationship (for KN-F) between species richness and canopy N distribution, but emphasize a link (positive relationship) between more foliar N per ground surface area in the upper layers of the canopy (i.e. under higher KN-G) and ecosystem CO2 uptake. Rao’s Q was not a good proxy for either K N .
format	article
author	Alexandru Milcu Arthur Gessler Christiane Roscher Laura Rose Zachary Kayler Dörte Bachmann Karin Pirhofer-Walzl Saša Zavadlav Lucia Galiano Tina Buchmann Michael Scherer-Lorenzen Jacques Roy
author_facet	Alexandru Milcu Arthur Gessler Christiane Roscher Laura Rose Zachary Kayler Dörte Bachmann Karin Pirhofer-Walzl Saša Zavadlav Lucia Galiano Tina Buchmann Michael Scherer-Lorenzen Jacques Roy
author_sort	Alexandru Milcu
title	Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
title_short	Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
title_full	Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
title_fullStr	Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
title_full_unstemmed	Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
title_sort	top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ffe70475fe654933a965270fe48531c7
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Top canopy nitrogen allocation linked to increased grassland carbon uptake in stands of varying species richness

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