Dramatic decline in the Swiss arable flora since the 1920s
Agriculture, Ecosystems & Environment（2017）
Abstract
•We examined changes in arable weed communities since the 1920s.•Species number per plot declined by over 60%, weed cover by 90%.•Neophytes and grasses increased in frequency.•More explicit conservation of rare arable weeds is needed.
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Key words
Arable weeds,Biogeographic regions,Conservation,Functional traits,Rare species,Re-visitation,Switzerland
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