Université de Neuchâtel

Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems

Bertrand, G ; Goldscheider, Nico ; Gobat, Jean-Michel ; Hunkeler, Daniel

In: Hydrogeology journal, 2012, vol. 20, p. 5-25

Aquifers provide water, nutrients and energy with various patterns for many aquatic and terrestrial ecosystems. Groundwater-dependent ecosystems (GDEs) are increasingly recognized for their ecological and socio-economic values. The current knowledge of the processes governing the ecohydrological functioning of inland GDEs is reviewed, in order to assess the key drivers constraining their...

Université de Neuchâtel

Effects of endogeic earthworms on the soil organic matter dynamics and the soil structure in urban and alluvial soil materials

Amossé, Joël ; Turberg, Pascal ; Kohler-Milleret, Roxane ; Gobat, Jean-Michel ; Le Bayon, Renée-Claire

In: Geoderma, 2015, vol. 243-244, p. 50-57

Earthworms are considered as key actors of soil processes at different spatial and temporal scales and provide essential ecosystem services linked to climate regulation or primary production. However, little is known about their basic functional roles (e.g. organic matter decomposition, soil structuring processes) in perturbed systems such as urban or alluvial soils. Alluvial soils are...

Université de Neuchâtel

Structure of microbial communities in Sphagnum peatlands and effect of atmospheric carbon dioxide enrichment

Mitchell, Edward A. D. ; Gilbert, Daniel ; Buttler, Alexandre ; Amblard, Christian ; Grosvernier, Philippe ; Gobat, Jean-Michel

In: Microbial Ecology, 2003, vol. 46, no. 2, p. 187-199

Little is known about the structure of microbial communities in Sphagnum peatlands, and the potential effects of the increasing atmospheric C02 concentration on these communities are not known. We analyzed the structure of microbial communities in five Sphagnum-dominated peatlands across Europe and their response to C02 enrichment using miniFACE systems. After...

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. ...