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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, J.; Domingues, T. F.; Schrodt, F.; Ishida, F. Y.; Feldpausch, T. R.; Saiz, G.; Quesada, C. A.; Schwarz, M.; Torello-Raventos, M.; Gilpin, M.; Marimon, B. S.; Marimon-Junior, B. H.; Ratter, J. A.; Grace, J.; Nardoto, G. B.; Veenendaal, E.; Arroyo, L.; Villarroel, D.; Killeen, T. J.; ... mehr


Sampling along a precipitation gradient in tropical South America extending from ca. 0.8 to 2.0 ma$^{-1}$, 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 (N$_{m}$) and potassium (K$_{m}$). Both N$_{m}$ and K$_{m}$ also increased with declining mean annual precipitation (P$_{A}$), but most area-based leaf traits such as leaf photosynthetic capacity showed no systematic variation with P$_{A}$ 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 $^{13}$C isotope discrimination). Moreover, when considered in a multivariate context with P$_{A}$ and soil plant available water storage capacity (θ$_{P}$) 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 P$_{A}$ and/or θ$_{P}$. ... mehr

Volltext §
DOI: 10.5445/IR/120101628
DOI: 10.5194/bgd-12-7879-2015
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1810-6277, 1810-6285
KITopen-ID: 120101628
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Biogeosciences discussions
Verlag Copernicus Publications
Band 12
Heft 22
Seiten 7879-7977
Nachgewiesen in Dimensions
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