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Université de Neuchâtel

Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

Liernur, Adrien ; Schomburg, Andreas ; Turberg, Pascal ; Guenat, Claire ; Le Bayon, Renée-Claire ; Brunner, Philip

In: Geoderma, 2017, vol. 308, p. 171-186

This paper presents the coupling of freeze-core sampling with X-ray CT scanning for the analysis of the soil structure of fine-grained, low-cohesive soils. We used a medical scanner to image the 3D soil structure of the frozen soil cores, providing X-ray CT data at a millimetric resolution over freeze-cores that are up to 62.5 cm long and 25 cm wide. The obtained data and the changes in gray...

Université de Neuchâtel

Subordinate plant species moderate drought effects on earthworm communities in grasslands

Mariotte, Pierre ; Le Bayon, Renée Claire ; Eisenhauer, Nico ; Guenat, Claire ; Buttler, Alexandre

In: Soil Biology & Biochemistry, 2016, vol. 96, p. 119-126

Loss of plant diversity resulting from forecasted drought events is likely to alter soil functioning and affect earthworm communities. Plant-soil interactions are expected to play an important role in mediating climate change effects on soil decomposers. In this study, we test above-belowground linkages after drought by focusing on the effects of subordinate plant species on earthworm...

Université de Neuchâtel

Rock-Eval pyrolysis discriminates soil macro-aggregates formed by plants and earthworms

Schomburg, Andreas ; Verrecchia, Eric P ; Guenat, Claire ; Brunner, Philip ; Sebag, David ; Le Bayon, Renée Claire

In: Soil Biology & Biochemistry, 2018, vol. 117, p. 117-124

Plants and earthworms, as soil ecosystem engineers, play a crucial role during stabilisation of organic matter in soil through its incorporation into soil aggregates. It is therefore essential to better understand the mechanisms and interactions of soil engineering organisms regarding soil organic matter stabilisation. Several methods have already been successfully applied to differentiate soil...

Université de Neuchâtel

Earthworm communities in alluvial forests : Influence of altitude, vegetation stages and soil parameters

Salomé, Clémence ; Guenat, Claire ; Bullinger-Weber, Géraldine ; Gobat, Jean-Michel ; Le Bayon, Renée-Claire

In: Pedobiologia, 2011, vol. 54S, p. S89-S98

In many terrestrial ecosystems, soil parameters usually regulate the distribution of earthworm communities. In alluvial ecosystems, few studies have investigated the impact of periodic floods and alluvium deposition on soil fauna. In this context, we assumed that earthworm communities may vary depending on altitude (alpine, subalpine, mountain and hill levels), forest successional stage...

Université de Neuchâtel

The modelling of soil-process functional units based on three-dimensional soil horizon cartography, with an example of denitrification in a riparian zone

Cosandey, Anne-Claude ; Guenat, Claire ; Bouzelboudjen, Mahmoud ; Maı̂tre, Véronique ; Bovier, Raphaël

In: Geoderma, 2003, vol. 112, no. 1-2, p. 111–129

This article aims to propose an approach for estimating the three-dimensional (3D) variability of denitrification. The concept of functional horizons is applied to the process of biological denitrification and 3D soil horizon cartography is used to estimate its spatial variation. On one hand, detailed fieldwork (186 pedological auger holes) was undertaken to map 3D horizon distribution within a...

Université de Neuchâtel

Three-dimensional GIS cartography applied to the study of the spatial variation of soil horizons in a Swiss floodplain

Santos Mendonça, M.L ; Guenat, Claire ; Bouzelboudjen, Mahmoud ; Golay, Frederic

In: Geoderma, 2000, vol. 97, no. 3-4, p. 351–366

In this study, we propose to establish a framework for the study of the spatial variability of the soils found in the floodplain of the Sarine River and for the visualisation of soil distribution patterns in two- and three-dimensions (2-D, 3-D). This environment is characterised by a large lateral and vertical spatial variability of soils that corresponds to the temporal and spatial variations of...

Université de Neuchâtel

Heterogeneity of soil carbon pools and fluxes in a channelized and a restored floodplain section (Thur River, Switzerland)

Samaritani, Emanuela ; Shrestha, J. ; Fournier, Bertrand ; Frossard, E. ; Gillet, François ; Guenat, Claire ; Niklaus, P. A. ; Pasquale, N. ; Tockner, K. ; Mitchell, Edward A. D. ; Luster, J.

In: Hydrogeology and Earth System Sciences, 2011, vol. 15, p. 1757-1769

Due to their spatial complexity and dynamic nature, floodplains provide a wide range of ecosystem functions. However, because of flow regulation, many riverine floodplains have lost their characteristic heterogeneity. Restoration of floodplain habitats and the rehabilitation of key ecosystem functions, many of them linked to organic carbon (C) dynamics in riparian soils, has therefore become a...

Université de Neuchâtel

Log decay of Picea abies in the Swiss Jura Mountains of central Europe

Bütler, Rita ; Patty, Lita ; Le Bayon, Renée-Claire ; Guenat, Claire ; Schlaepfer, Rodolphe

In: Forest Ecology and Management, 2007, vol. 242, no. 2-3, p. 791-799

The key importance of coarse woody debris (CWD) for biodiversity is well acknowledged. However, its role in terrestrial nutrient and carbon cycles is less studied, in particular in central Europe. We analysed the decay process of spruce Picea abies (L.) Karst., the most common tree species in Switzerland. The aims were: (i) to examine the usefulness of ultrasonic wave measurements for...

Université de Neuchâtel

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Bullinger-Weber, G. ; Le Bayon, Renée-Claire ; Gobat, Jean-Michel ; Guenat, Claire

In: European Journal of Soil Biology, 2007, vol. 43, no. 1, p. 47-70

This study examines the role of abiotic (texture, calcium carbonates or iron) and biotic parameters (earthworm and enchytraeid activities) on the initial phases of soil aggregation. Our research focused on humus forms in alluvial soils, which are considered as young and heterogeneous environments. We hypothesized that the soil structure formation is determined by both the nature of the recent...