Biography:

In the past Sébastien Barot has collaborated on articles with Kam-Rigne Laossi and Tanvir Shahzad. One of their most recent publications is Effects of an endogeic and an anecic earthworm on the competition between four annual plants and their relative fecundity. Which was published in journal Soil Biology and Biochemistry.

More information about Sébastien Barot research including statistics on their citations can be found on their Copernicus Academic profile page.

Sébastien Barot's Articles: (10)

Effects of an endogeic and an anecic earthworm on the competition between four annual plants and their relative fecundity

AbstractCompetition between plants for essential resources determines the distribution of biomasses between species as well as the composition of plant communities through effects on species reproductive potentials. Soil organisms influence plant competitive ability and access to resources; thus they should modify plant community composition. The effects of an endogeic (Aporrectodea caliginosa) and an anecic (Lumbricus terrestris) earthworm species on the competition between grass (Poa annua), two forbs (Veronica persica and Cerastium glomeratum) and legume (Trifolium dubium) were investigated in a greenhouse experiment. We established two types of plant communities: monocultures and polycultures of the four species. L. terrestris increased the biomass of P. annua and V. persica (in monocultures as well as in polycultures). However, the presence of L. terrestris allowed the grass to produce the highest biomass in polycultures suggesting that this earthworm species promoted the growth of P. annua against the other plant species. In monocultures as well as in polycultures, the presence of L. terrestris to increased the number of seeds of T. dubium and the total seed mass of V. persica. These results suggest that L. terrestris enhanced the short term competitive ability of P. annua by promoting its growth. The increased number of seeds of T. dubium in the presence of L. terrestris suggests that this earthworm species could enhance the long-term competitive ability of this legume and may increase its number of individuals after several generations.

Contribution of exudates, arbuscular mycorrhizal fungi and litter depositions to the rhizosphere priming effect induced by grassland species

Highlights•Role of root exudates, AMF and roots in rhizosphere priming effect (RPE) was disentangled.•Differentially permeable meshes and continuous 13C labeling of grassland monocultures were used.•Root exudation induced 58–96 % of total RPE whereas the rest was contributed by roots.•RPE efficiency was 3–7 times higher for exudates than roots.•Microbial allocation of plant C to mineralizing activity than growth explains higher RPE for exudates.

Review PaperContrasting effects of grasses and trees on microbial N-cycling in an African humid savanna

Highlights•Dominant savanna grass species inhibit nitrification and savanna tree species not.•Denitrification is higher under trees than under grasses.•Archaea nitrifiers are strongly involved in nitrification in savanna.•Dominant grasses likely inhibit the archaeal nitrification pathway.•These results should be considered to predict savanna N budget and N2O emissions.

Universality of priming effect: An analysis using thirty five soils with contrasted properties sampled from five continents

Highlights•The importance of soil properties, land use, and soil fractions on the direction and magnitude of the priming effect (PE) is still unclear.•A positive PE was observed in a large range of soil types and land uses including grassland, cropland, forest, savannah and an orchard.•Land use did not explain variations in the PE, but the PE was significantly higher in surface than deep soils (0–20 cm vs 40–60 cm).•The intensity of PE increased with soil organic matter (SOM) fractions free of minerals and rich in nitrogen (N).•PE is a widespread process and must be integrated in ecosystem and Earth system models for better predictions of SOM dynamics.

Trace element concentrations along a gradient of urban pressure in forest and lawn soils of the Paris region (France)

Highlights•The anthropogenic trace elements are cadmium, copper, lead and zinc.•The anthropogenic concentrations increase from the rural to the urban area.•The first source of pollution for anthropogenic trace elements is the road traffic.•Cement plants are the second source of cadmium.•The trace element pollutions are impacted by the legacy of the soil history.

Urban ecology, stakeholders and the future of ecology

Highlights•A research agenda for urban ecology was built by scientists and stakeholders.•Questions on biodiversity, ecosystems, interactions with humans are distinguished.•For all types of issue it is possible to ask fundamental and applied questions.•Urban ecology will likely be more and more influential in the development of ecology.•The future of towns, their biodiversity and the life of city dwellers is at stake.

The indirect impact of encroaching trees on gully extension: A 64 year study in a sub-humid grassland of South Africa

AbstractGully erosion and woody plant encroachment are frequently observed in grasslands worldwide. Gully erosion driven by water processes is usually affected by topography, land-use change and vegetation cover. We hypothesised that trees, through their potential link with overland and subsurface flow, may have an impact on gully extension. However, very few studies have simultaneously considered tree encroachment and gullies. We used aerial photographs to study Acacia sieberiana encroachment and gully erosion in a South African grassland (KwaZulu-Natal Province) for a period lasting 64 years. At the catchment scale, results showed that acacias started invading after 1976 and transformed the grassland into a savanna with 9.45% of tree cover in 2009. Gully area increased by 3.9% in the last 64 years and represented 12.76% of catchment area in 2009. Mean estimated sediment loss was 200 Mg ha− 1 of gully y− 1, indicating a high erosion rate mainly due to the collapse of gully banks after swelling and shrinking. Volumetric retreat rate (V) of 15 gully heads was correlated with drainage area (Drain.A) by a power function explaining 64% of the variance: V = 0.02*Drain.A0.83. A positive correlation between gully retreat rate and Acacia canopy area was measured between 2001 and 2009 when established tree encroachment was observed. These results, associated with the susceptibility of this soil to subsurface flow and the observation of pipe erosion systems in the field, showed that both surface and subsurface processes occur in this sub-humid grassland and that trees can be indirectly associated with increased gully erosion.

Impact of soil engineering by two contrasting species of earthworms on their dispersal rates

Highlights•Dispersal behaviour and activity of two common earthworm species in temperate areas.•Impact of earthworm activities and their accumulation on their dispersal.•Dispersal rates of one species decreased with the earthworm activities.•Indications on the existence of a niche construction process in earthworms.

Positive effects of wheat variety mixtures on aboveground arthropods are weak and variable

Highlights•Wheat variety mixtures have contrasting effects on aboveground arthropod communities.•Wheat intraspecific diversity has a weak positive effect on predator abundances.•Wheat intraspecific and functional diversity have a weak negative effect on spider evenness.•Few wheat stand characteristics have effects on ground or rove beetles.

Ecological engineering: from concepts to applications Foreword

AbstractThe International Congress “Ecological Engineering; from concepts to applications”, Paris, was held on 2-4 December, 2009 [3]. These three days were dedicated to the exploration of new breakthroughs in ecological engineering and reflections on the way to develop the field and ground it on sound ecological and conceptual bases

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