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Poster communications

Towards Fungal Descriptors as a New Tool for the Assessment of the Quality of Agricultural Soils

Abstract : Typically, ecotoxicological studies concerning the soil ecosystem are performed using a combination of two approaches. The first one deals with the dynamics of toxic compounds in the soil, the second one concerns the effects of these compounds on selected non-target species. In addition, ecotoxicological risk assessment needs probabilistic or modelling features. Nevertheless the interpretation of the results obtained using these approaches is often difficult in the case of soil micro-organisms (the main actors of soil functioning) and can be in many cases non-conclusive. It is especially true regarding cultivated soil ecosystems because of numerous pedoclimatic and environmental situations, agricultural practices, parameters and protocols to measure their levels… Thus, for all these reasons, a biological state of reference is difficult to precise in cultivated soils. We develop an approach intended to combine physico-chemical and biological descriptors of the soil (bacterial/fungal biomass and activity) in order to (i) define characteristics of the biological status of the soil, (ii) assess/rank the effects of soil pollutants (copper) on that state, in excluding the natural variations of the microbial communities in response to pedoclimatic and agricultural conditions. Here, our work is centred on three main topics: -the development of analytical tools to characterize fungal biomass for natural (meadow) or cultivated (crop) soils, -the study of the variation of this microbial community in response to environmental (pollutions) or agronomic (practices) in microcosms, -the validation of these descriptors (ergosterol, PLFAs, 18S DNA) as indication the soil quality. The experimental data will be used for mathematic modelling in order to explain/predict the variation of the fungal biomass compare to the other compartments (bacterial communities and the activities).
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Poster communications
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  • HAL Id : hal-02817893, version 1
  • PRODINRA : 20388

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Marc Legras, Caroline Bailleul, Christophe Gangneux, Patrice Lepeletier, Karine Laval, et al.. Towards Fungal Descriptors as a New Tool for the Assessment of the Quality of Agricultural Soils. 8. European Meeting on Environmental Chemistry, Dec 2007, Inverness, United Kingdom. 2007. ⟨hal-02817893⟩

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