La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The effects of NH4+ and NO3− on growth, resource allocation and nitrogen uptake kinetics of Phragmites australis and Glyceria maxima (2005)
Auteurs :	Edita Tylova (Munzarova, Auteur ; Bent Lorenzen, Auteur ; Hans Brix, Auteur ; Olga Votrubová, Auteur
Type de document :	Article
Dans :	Aquatic Botany (81 April 1, 2005)
Article en page(s) :	326-342
Résumé :	The effects of NH4⁺ or NO3⁻ on growth, resource allocation and nitrogen (N) uptake kinetics of two common helophytes Phragmites australis (Cav.) Trin. ex Steudel and Glyceria maxima (Hartm.) Holmb. were studied in semi steady-state hydroponic cultures. At a steady-state nitrogen availability of 34 μM the growth rate of Phragmites was not affected by the N form (mean RGR = 35.4 mg g⁻¹ d⁻¹), whereas the growth rate of Glyceria was 16% higher in NH4⁺-N cultures than in NO3⁻-N cultures (mean = 66.7 and 57.4 mg g⁻¹ d⁻¹ of NH4⁺ and NO3⁻ treated plants, respectively). Phragmites and Glyceria had higher S/R ratio in NH4⁺ cultures than in NO3⁻ cultures, 123.5 and 129.7%, respectively.

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