Université de Neuchâtel

Spatio-temporal dynamics of bacterial communities associated with two plant species differing in organic acid secretion: A one-year microcosm study on lupin and wheat

Weisskopf, Laure ; Le Bayon, Renée-Claire ; Kohler, Florian ; Page, Valérie ; Jossi, Maryline ; Gobat, Jean-Michel ; Martinoia, Enrico ; Aragno, Michel

In: Soil Biology and Biochemistry, 2008, vol. 40, no. 7, p. 1772-1780

Plants are generally assumed to influence the surrounding soil microflora through rhizodeposition. However, the role of rhizodeposits, and especially organic acids, in structuring the bacterial communities is still poorly understood. In this study, we asked the question whether plants differing in organic acid secretion have a different impact on the soil bacterial communities, and if this is the...

Université de Neuchâtel

Soil Microbial Community Changes in Wooded Mountain Pastures due to Simulated Effects of Cattle Grazing

Kohler, Florian ; Hamelin, Jérôme ; Gillet, François ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Plant and Soil, 2005, vol. 278, no. 1-2, p. 327-340

The effect of cattle activity on pastures can be subdivided into three categories of disturbances: herbage removal, dunging and trampling. The objective of this study was to assess separately or in combination the effect of these factors on the potential activities of soil microbial communities and to compare these effects with those of soil properties and plant composition or biomass. Controlled...

Université de Neuchâtel

Seasonal vegetation changes in mountain pastures due to simulated effects of cattle grazing

Kohler, Florian ; Gillet, François ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Journal of Vegetation Science, 2004, vol. 15, no. 2, p. 143-150

Cattle influence grassland dynamics in three ways: herbage removal, dung deposition and trampling. The objective of this study was to assess the effects of these factors, separately or in combination, and to compare them with cattle grazing over a one year period in a field experiment conducted in the Jura Mountains of northwestern Switzerland. A set of controlled treatments simulating the three...

Université de Neuchâtel

Effect of cattle activities on gap colonization in mountain pastures

Kohler, Florian ; Gillet, François ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Folia Geobotanica, 2006, vol. 41, no. 3, p. 289-304

Cattle influences gap dynamics in pastures in two ways: (1) by creating gaps and (2) by affecting the colonization process. This effect of cattle activity on gap revegetation can be subdivided in three main factors: herbage removal, trampling and dung and urine deposition. The objective of this study was to assess how these three effects moderate the plant succession following gap creation. ...

Université de Neuchâtel

Spatial and Seasonal Patterns of Cattle Habitat use in a Mountain Wooded Pasture

Kohler, Florian ; Gillet, François ; Reust, Stéphanie ; Wagner, Helene H. ; Gadallah, Fawziah ; Gobat, Jean-Michel ; Buttler, Alexandre

In: Landscape Ecology, 2006, vol. 21, no. 2, p. 281-295

Management-oriented models of cattle habitat use often treat grazing pressure as a single variable summarizing all cattle activities. This paper addresses the following questions: How does the spatial pattern of cattle effects vary between cattle activities in a highly heterogeneous landscape? Do these patterns change over the grazing season as forage availability decreases? What are the...

Université de Neuchâtel

How elevated pCO2 modifies total and metabolically active bacterial communities in the rhizosphere of two perennial grasses grown under field conditions

Jossi, Maryline ; Fromin, Nathalie ; Tarnawski, Sonia ; Kohler, Florian ; Gillet, François ; Aragno, Michel ; Hamelin, Jérôme

In: FEMS Microbiology Ecology, 2006, vol. 55, no. 3, p. 339-350

The response of total (DNA-based analysis) and active (RNA-based analysis) bacterial communities to a pCO2 increase under field conditions was assessed using two perennial grasses: the nitrophilic Lolium perenne and the oligonitrophilic Molinia coerulea. PCR- and reverse transcriptase-PCR denaturing gradient gel electrophoresis analysis of 16S rRNA genes generated...