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Master Thesis

Étude de l’effet du paysage sur la diversité des assemblages de plantes adventices dans la plaine du Val de Sèvre

Abstract : For a while, weed emerged as highly harmful to farming/cultivation. Today, from an agroecological perspective, they appear as a key element within agroecosystems by privileging pests' wild biodiversity as well as to be favoring agricultural production through pollination and pest biological regulation. However, to provide all those ecosystem services, species diversity from those weed blends must be high. The goal of this internship was to study the way landscape influences this diversity. From the observation of 253 weed plots in the "Plaine & Val de Sèvre" Zone Atelier spread on a 450km² area, we tempted to quantify the influence of landscape variables on weed diversity within cereal, sunflower, or rapeseed parcels, using four landscape variables : the presence of crops sown in winter, of the ones sown in spring or in summer, the presence of pastures and finally the presence of organic fields. We also used two new methods in order to directly estimate the scale of this influence via maximum likelihood, by estimating buffers or spatial influence functions. The acquired data suggest that the weed blends diversity is especially supported by the presence of crops sown at the same date in a 50m to 1,5km area of proximity. Although these first analyses need to be dealt with more depth, they seem to highlight the landscape management as a potential key element in the sustainable management of crop growing.
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Master Thesis
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Submitted on : Thursday, November 28, 2019 - 9:25:25 AM
Last modification on : Monday, July 6, 2020 - 3:38:27 PM
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Mathilde Souillot. Étude de l’effet du paysage sur la diversité des assemblages de plantes adventices dans la plaine du Val de Sèvre. Sciences du Vivant [q-bio]. 2019. ⟨dumas-02383854⟩



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