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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Fog as a source of nitrogen for redwood trees: evidence from fluxes and stable isotopes
Auteurs :	Pamela H. Templer, Auteur ; Kathleen C. Weathers, Auteur ; Holly A. Ewing, Auteur ; Todd E. Dawson, Auteur ; Stefania Mambelli, Auteur ; Amanda M. Lindsey, Auteur ; Jeramy Webb, Auteur ; Vanessa K. Boukili, Auteur ; Mary K. Firestone, Auteur
Type de document :	Article
Dans :	Journal of Ecology (103(6) NOV 2015)
Article en page(s) :	1397-1407
Langues:	Anglais
Résumé :	A defining feature of the redwood forest in coastal California is the presence of fog in the summer months, a time when there is typically little rainfall. Our goal was to determine the role of summer fog in canopy transformation of nitrogen, nitrogen uptake by trees and photosynthesis within a coastal redwood forest ecosystem. We measured horizontal and vertical inputs of nitrogen, the isotopic composition of nitrogen in a variety of atmospheric sources (summer fog, winter rain and throughfall throughout the year), nitrogen pools (soil solution) and plant tissue (roots and foliage), as well as rates of photosynthesis and nitrogen uptake by trees. Throughfall nitrogen fluxes were greater at the forest edge compared to the interior both within the canopy (sampled 10m above-ground) and onto the forest floor (sampled 1m above-ground; P0.05). Nitrification in the forest floor, rather than the canopy, is the primary source of NO3- in these soils throughout the year. Synthesis. Summer fog provides nitrogen directly and indirectly to redwood trees, especially those at the forest edge, and affects the physiologic function of redwood trees.

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