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RESEARCH PRODUCT

Which traits allow weed species to persist in grass margin strips ?

David A. BohanBruno ChauvelMatthew R. RyanXavier ReboudStéphane Cordeau

subject

0106 biological sciencesfunctional group[SDV]Life Sciences [q-bio]Plant ScienceBiology010603 evolutionary biology01 natural sciencesMonocotyledonEcosystem servicesagri-environmental schemesMargin (machine learning)field marginRuderal species2. Zero hunger[ SDV ] Life Sciences [q-bio]traitEcologyfungiDicotyledonfood and beverages04 agricultural and veterinary sciences15. Life on landbiology.organism_classificationfield edgeDisturbance (ecology)040103 agronomy & agricultureTrait0401 agriculture forestry and fisheriescommunity assemblyWeedAgronomy and Crop Science

description

EASPEGESTADINRA; Sown-grass margin strips, historically established to limit pesticide drift and soil erosion, are now also promoted for enhancing floral diversity and associated ecosystem services. To better understand weed community assembly in grass margin strips, we performed floral surveys in 75 sown-grass margin strips in two regions in France and characterized each species using information from trait databases. We hypothesized that traits of dominant species would differ between newly sown-grass margin strips and older strips. Weed species were separated into functional groups based on their traits using multiple correspondence analysis and hierarchical ascendant classification. Functional group trajectories were investigated in sown-grass margin strips that differed in age using a space-for-time substitution approach. We found that geophyte, competitor, and monocotyledon species were more frequent and abundant in grass margin strips than therophyte, ruderal, and dicotyledon species. Results also showed that floral diversity was greatest in grass margin strips of intermediate age. Our findings have implications for optimizing diversity and ecosystem services on land enrolled in conservation programs and suggest that mowing later in the season and periodic soil disturbance can increase floral diversity. The analytical framework that we introduced in this research can also be used to explore weed community assembly in other systems.

10.1017/wsc.2016.39https://hal.archives-ouvertes.fr/hal-01606098