Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function

Lloyd, Jon; null, Tomas; Schrodt, Franziska; Ishida, Francoise Yoko; Feldpausch, Ted R.; Saiz, Gustavo; Quesada, Carlos Alberto; Schwarz, Michael; Torello-Raventos, Mireia; Gilpin, Martin; Marimon, Beatriz Schwantes; Marimon Júnior, Ben Hur; Ratter, James Alexander; Grace, John; Nardoto, G. B.; Veenendaal, Elmar M.; Arroyo, Luzmila P.; Villarroel, Daniel; Killeen, Timothy J.; Steininger, Marc K.; Phillips, Oliver L.

Artigo

Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function

Sampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 m ag-1, savanna soils had consistently lower exchangeable cation concentrations and higher C/N ratios than nearby forest plots. These soil differences were also reflected in canopy averaged leaf traits wi...

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Autor principal:	Lloyd, Jon
Outros Autores:	null, Tomas, Schrodt, Franziska, Ishida, Francoise Yoko, Feldpausch, Ted R., Saiz, Gustavo, Quesada, Carlos Alberto, Schwarz, Michael, Torello-Raventos, Mireia, Gilpin, Martin, Marimon, Beatriz Schwantes, Marimon Júnior, Ben Hur, Ratter, James Alexander, Grace, John, Nardoto, G. B., Veenendaal, Elmar M., Arroyo, Luzmila P., Villarroel, Daniel, Killeen, Timothy J., Steininger, Marc K., Phillips, Oliver L.
Grau:	Artigo
Idioma:	English
Publicado em:	Biogeosciences 2020
Assuntos:	Carbon Ecotone Forest Canopy Leaf Morphology Magnesium Nitrogen Photosynthesis Physiological Response Potassium Precipitation (climatology) Savanna Soil Texture Tropical Region Vegetation Structure Woody Plant Africa Amazon Basin
Acesso em linha:	https://repositorio.inpa.gov.br/handle/1/14911

id	oai:repositorio:1-14911
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spelling	oai:repositorio:1-14911 Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function Lloyd, Jon null, Tomas Schrodt, Franziska Ishida, Francoise Yoko Feldpausch, Ted R. Saiz, Gustavo Quesada, Carlos Alberto Schwarz, Michael Torello-Raventos, Mireia Gilpin, Martin Marimon, Beatriz Schwantes Marimon Júnior, Ben Hur Ratter, James Alexander Grace, John Nardoto, G. B. Veenendaal, Elmar M. Arroyo, Luzmila P. Villarroel, Daniel Killeen, Timothy J. Steininger, Marc K. Phillips, Oliver L. Carbon Ecotone Forest Canopy Leaf Morphology Magnesium Nitrogen Photosynthesis Physiological Response Potassium Precipitation (climatology) Savanna Soil Texture Tropical Region Vegetation Structure Woody Plant Africa Amazon Basin Sampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 m ag-1, savanna soils had consistently lower exchangeable cation concentrations and higher C/N ratios than nearby forest plots. These soil differences were also reflected in canopy averaged leaf traits with savanna trees typically having higher leaf mass per unit area but lower mass-based nitrogen (Nm) and potassium (Km). Both Nm and Km also increased with declining mean annual precipitation (PA), but most area-based leaf traits such as leaf photosynthetic capacity showed no systematic variation with PA or vegetation type. Despite this invariance, when taken in conjunction with other measures such as mean canopy height, area-based soil exchangeable potassium content, [K]sa , proved to be an excellent predictor of several photosynthetic properties (including 13C isotope discrimination). Moreover, when considered in a multivariate context with PA and soil plant available water storage capacity (θP) as covariates, [K]sa also proved to be an excellent predictor of stand-level canopy area, providing drastically improved fits as compared to models considering just PA and/or θP. Neither calcium, nor magnesium, nor soil pH could substitute for potassium when tested as alternative model predictors (ΔAIC > 10). Nor for any model could simple soil texture metrics such as sand or clay content substitute for either [K]sa or θP. Taken in conjunction with recent work in Africa and the forests of the Amazon Basin, this suggests-in combination with some newly conceptualised interacting effects of PA and θP also presented here-a critical role for potassium as a modulator of tropical vegetation structure and function. © 2015 Author(s). 2020-05-07T13:47:21Z 2020-05-07T13:47:21Z 2015 Artigo https://repositorio.inpa.gov.br/handle/1/14911 10.5194/bg-12-6529-2015 en Volume 12, Número 22, Pags. 6529-6571 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Biogeosciences
institution	Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection	INPA-RI
language	English
topic	Carbon Ecotone Forest Canopy Leaf Morphology Magnesium Nitrogen Photosynthesis Physiological Response Potassium Precipitation (climatology) Savanna Soil Texture Tropical Region Vegetation Structure Woody Plant Africa Amazon Basin
spellingShingle	Carbon Ecotone Forest Canopy Leaf Morphology Magnesium Nitrogen Photosynthesis Physiological Response Potassium Precipitation (climatology) Savanna Soil Texture Tropical Region Vegetation Structure Woody Plant Africa Amazon Basin Lloyd, Jon Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
topic_facet	Carbon Ecotone Forest Canopy Leaf Morphology Magnesium Nitrogen Photosynthesis Physiological Response Potassium Precipitation (climatology) Savanna Soil Texture Tropical Region Vegetation Structure Woody Plant Africa Amazon Basin
description	Sampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 m ag-1, savanna soils had consistently lower exchangeable cation concentrations and higher C/N ratios than nearby forest plots. These soil differences were also reflected in canopy averaged leaf traits with savanna trees typically having higher leaf mass per unit area but lower mass-based nitrogen (Nm) and potassium (Km). Both Nm and Km also increased with declining mean annual precipitation (PA), but most area-based leaf traits such as leaf photosynthetic capacity showed no systematic variation with PA or vegetation type. Despite this invariance, when taken in conjunction with other measures such as mean canopy height, area-based soil exchangeable potassium content, [K]sa , proved to be an excellent predictor of several photosynthetic properties (including 13C isotope discrimination). Moreover, when considered in a multivariate context with PA and soil plant available water storage capacity (θP) as covariates, [K]sa also proved to be an excellent predictor of stand-level canopy area, providing drastically improved fits as compared to models considering just PA and/or θP. Neither calcium, nor magnesium, nor soil pH could substitute for potassium when tested as alternative model predictors (ΔAIC > 10). Nor for any model could simple soil texture metrics such as sand or clay content substitute for either [K]sa or θP. Taken in conjunction with recent work in Africa and the forests of the Amazon Basin, this suggests-in combination with some newly conceptualised interacting effects of PA and θP also presented here-a critical role for potassium as a modulator of tropical vegetation structure and function. © 2015 Author(s).
format	Artigo
author	Lloyd, Jon
author2	null, Tomas Schrodt, Franziska Ishida, Francoise Yoko Feldpausch, Ted R. Saiz, Gustavo Quesada, Carlos Alberto Schwarz, Michael Torello-Raventos, Mireia Gilpin, Martin Marimon, Beatriz Schwantes Marimon Júnior, Ben Hur Ratter, James Alexander Grace, John Nardoto, G. B. Veenendaal, Elmar M. Arroyo, Luzmila P. Villarroel, Daniel Killeen, Timothy J. Steininger, Marc K. Phillips, Oliver L.
author2Str	null, Tomas Schrodt, Franziska Ishida, Francoise Yoko Feldpausch, Ted R. Saiz, Gustavo Quesada, Carlos Alberto Schwarz, Michael Torello-Raventos, Mireia Gilpin, Martin Marimon, Beatriz Schwantes Marimon Júnior, Ben Hur Ratter, James Alexander Grace, John Nardoto, G. B. Veenendaal, Elmar M. Arroyo, Luzmila P. Villarroel, Daniel Killeen, Timothy J. Steininger, Marc K. Phillips, Oliver L.
title	Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
title_short	Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
title_full	Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
title_fullStr	Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
title_full_unstemmed	Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
title_sort	edaphic, structural and physiological contrasts across amazon basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function
publisher	Biogeosciences
publishDate	2020
url	https://repositorio.inpa.gov.br/handle/1/14911
_version_	1787142585841614848
score	11.755432

Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function

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