Nitrogen fertiliser rate affects the frequency of nitrate-dissimilating <i>Pseudomonas</i> spp. in the rhizosphere of <i>Lolium perenne</i> grown under elevated pCO<sub>2</sub> (Swiss FACE)
Tarnawski, Sonia Estelle
Date de parution
Soil Biology and Biochemistry, 2005/37/1962-1965
The effect of elevated pCO<sub>2</sub> (60 Pa) on the frequency of nitrate-dissimilating <i>Pseudomonas</i> (NDP) was investigated in the rhizosphere of fertilised <i>Lolium perenne</i> swards in the Swiss Free Air Carbon dioxide Enrichment (FACE) experiment. Numbers of cultivable root-associated <i>Pseudomonas</i> were greater under elevated (60 Pa) than under ambient (36 Pa) pCO<sub>2</sub> in both high and low N-fertilised swards. For both pCO<sub>2</sub> conditions, the NDP frequency decreased with closer root proximity to <i>L. perenne</i> roots in low fertilised swards. Anyway, in high N swards the NDP frequency was similar in root and soil fractions. Thus, N availability may be a major factor influencing NDP populations under elevated pCO<sub>2</sub>, most likely due to increased competition for N between plant and nitrate-dissimilating bacteria.
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger