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	Provedor de dados ArchiMer (1) Autor Auby, Isabelle (1) Bourgues, S (1) Dewit, R (1) Welsh, Dt (1) Palavra-chave Acetylene reduction (1) Ammonium (1) Carbon sources (1) Nitrogen fixation (1) Plant photosynthesis (1) Rhizosphere (1) Root exudates (1) Zostera noltii (1) Mais... Tipo do documento Text (1) Ano 1997 (1) País France (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Effect of plant photosynthesis, carbon sources and ammonium availability on nitrogen fixation rates in the rhizosphere of Zostera noltii ArchiMer Welsh, Dt; Bourgues, S; Dewit, R; Auby, Isabelle. Rates of nitrogen fixation (measured as acetylene reduction) in the rhizosphere of the seagrass Zostera noltii were highly dependent upon plant photosynthetic activity being significantly stimulated at elevated CO2 concentrations and by light, both in the short-term and over diurnal cycles. Stimulation by light became insignificant when 5 mM sucrose was added to the sediment porewater, indicating that in the absence of added carbon sources, light stimulation was due to direct inputs of plant photosynthate to the rhizosphere. Addition of a range of carbon sources to the rhizosphere sediment stimulated rates of acetylene reduction, with this stimulation being significant for sucrose and lactate. Surprisingly, whilst low additions of ammonium to the sediment... Tipo: Text Palavras-chave: Acetylene reduction; Nitrogen fixation; Rhizosphere; Zostera noltii; Plant photosynthesis; Root exudates; Carbon sources; Ammonium. Ano: 1997 URL: http://archimer.ifremer.fr/doc/00151/26266/24350.pdf Registros recuperados: 1 Primeira ... 1 ... Última

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