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(W/MF205) Soil microarthropods and organic matter decomposition as bioindicators of soil agricultural maintenance in French vineyards. Renaud, Angélique1, Poinsot-Balaguer, Nicole1, Cortet, Jérôme1, 1 ABSTRACT- These last years, different alternative soil working techniques have been developed in vineyards to increase vine quality and reduce herbicide treatments. To evaluate the impact of these practices on soils, bioindicators are necessary. In this purpose, we have tested the pertinence of microarthropods and organic matter decomposition and evaluated different sampling methodologies (soil cores and short duration litter-bag colonisation for microarthropods, long duration litter-bag containing straw for organic matter decomposition). In our study, four techniques of soil maintenance have been compared : tillage, controlled natural grass with post-levee herbicides, natural grass, non cultivation with pre and post-levee herbicides. The different techniques adopted for microarthropods sampling showed the greatest abundance of mesofauna in natural grass, while the lowest was observed in tillage treatments. Herbicide treatments also strongly decreased microarthropod populations compared to natural grass. The two sampling methods were complementary. Litter decomposition parameters from long term duration litter-bags should give us other interesting information, especially concerning the impact on soil functioning. Key words: microarthropods, litterbags, herbicides, tillage |
