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Master Thesis

Can traits help us understanding the response of weed flora to viticultural practices?

Abstract : The aim of this study was to understand the impact of viticultural practices on weed flora using a trait-based approach, to help winegrowers managing the weeds in an environmentally friendly way without economic losses. The study takes place in 101 Bordeaux vineyards plots, where floristic samples have been made twice (April, June 2015) in two distinct areas (rows, inter-rows). Statistical analyses have been performed to test the relationships between species trait values, environmental variables (weather, soil properties, landscape) and management practices, using linear models, and multivariate analyses (RLQ – fourth corner analyses). Three approaches have been developed at different levels of management practices (using either organic versus conventional, homogeneous groups of plots with similar management systems based on a multivariate classification of raw variables, or directly the raw variables). First, the results showed a difference in the Grime CSR strategies along a gradient of disturbance. In disturbed areas (on the rows and where herbicides and/or tillage was applied), a convergence of trait values of weeds was observed with a ruderal strategy, characterized by an annual life cycle, an auto-apogamous reproduction and a baro-autochory dispersal. In less disturbed areas (on the inter-rows and were mowing was applied), the range of trait values of weeds was higher and they harbor a competitive strategy characterized by a pluri-annual life cycle (hemicryptophytes), an entomogamous pollination and an animal dispersal. To a lesser extent, an influence of the resource gradient was also highlighted with more competitive species (higher seed mass and stature) found on richer soils (higher soil pH). The clustering of groups with similar management practices appeared as a good compromise to understand patterns and to communicate towards winegrowers.
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Master Thesis
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Cécile Blanchet. Can traits help us understanding the response of weed flora to viticultural practices?. Life Sciences [q-bio]. 2019. ⟨dumas-02362702⟩

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