La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	C(3) and C(4) Biomass Allocation Responses to Elevated CO(2) and Nitrogen: Contrasting Resource Capture Strategies
Auteurs :	K. P. White, Auteur ; J. A. Langley, Auteur ; D. R. Cahoon, Auteur ; J. P. Megonigal, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (35(4) JUL 2012)
Article en page(s) :	1028-1035
Résumé :	Plants alter biomass allocation to optimize resource capture. Plant strategy for resource capture may have important implications in intertidal marshes, where soil nitrogen (N) levels and atmospheric carbon dioxide (CO(2)) are changing. We conducted a factorial manipulation of atmospheric CO(2) (ambient and ambient + 340 ppm) and soil N (ambient and ambient + 25 g m(-2) year(-1)) in an intertidal marsh composed of common North Atlantic C(3) and C(4) species. Estimation of C(3) stem turnover was used to adjust aboveground C(3) productivity, and fine root productivity was partitioned into C(3)-C(4) functional groups by isotopic analysis. The results suggest that the plants follow resource capture theory. The C(3) species increased aboveground productivity under the added N and elevated CO(2) treatment (P

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