Landscape is the main driver of weed assemblages in field margins but is outperformed by crop competition in field cores - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plants Année : 2021

Landscape is the main driver of weed assemblages in field margins but is outperformed by crop competition in field cores

Résumé

Weeds are considered a major pest for crops, and as such have been intensively managed by farmers. However, weeds, by providing resources, also support farmland biodiversity. The challenge for sustainable weed management is therefore to maintain weed diversity without compromising crop production. Meeting this challenge requires determining the processes that shape weed assemblages, and how agricultural practices and landscape arrangement affect them. In this study, we assess the effects of crop competition on weeds, nitrogen input, weed control and landscape on both weed diversity and abundance in the margins and centres of 115 oilseed rape fields in Western France. We show that weed assemblages in field cores were mainly shaped by crop height, a proxy of crop competition. By contrast, weed assemblages in field margins increased with the number of meadows in the landscape, revealing the role of spatial dispersal. Using structural equation modelling, we further show that in the field core, weed assemblages were also indirectly shaped by landscape through spatial dispersal from the field margin. Overall, our study gives empirical support for crop competition as a way to reduce the intensity of chemical weeding, and for meadows as a way to enhance biodiversity in the landscape.

Dates et versions

hal-03559827 , version 1 (07-02-2022)

Identifiants

Citer

Adrien Berquer, Olivier Martin, Sabrina Gaba. Landscape is the main driver of weed assemblages in field margins but is outperformed by crop competition in field cores. Plants, 2021, 10 (10), pp.1-15. ⟨10.3390/plants10102131⟩. ⟨hal-03559827⟩
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