Effet des cultures mixtes et pratiques associées sur les carabes

Abstract : Agricultural pratices have damaging effects on biodiversity and consequently on ecosystem services. Current issues are to create better conditions to enhance biodiversity on the trophic chain and particulary in plant communities. In cultivation systems, intercrops can enhance pests regulation by dilution effect (bottom-up) or by increasing natural ennemies (top-down effect). This study focused on ground beetles famed to be a great predator of aphids, slugs and weed seeds. Datas about arthropod fauna have been collected during ten years at the INRA experimental Mirecourt farm after organic conversion. Linear models application permit to predict intercrops effect on ground beetles activity density. The main results are : (1) Intercrop two species are better than intercrop four species. (2) Phytophage and large ground beetles are better improved by cereals than intercrop, nevertheless, small and medium ground beetles are improved by intercrop. (3) Disturbance due to tillage impacts carabids activity-density as well as weeds abondance. However models must be improved, in particulary for tillage variable and weeds abondance variable, in order to optimize intercrop pests control.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2016_MERCIER_ANTONIN.pdf
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Antonin Mercier. Effet des cultures mixtes et pratiques associées sur les carabes. Sciences de l'environnement. 2016. ⟨hal-01824312⟩

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