Weed interference with field-grown soyabean decreases under elevated [CO 2] in a FACE experiment

Research output: Contribution to journalArticle

Abstract

Rising atmospheric [CO 2] is predicted to affect C 3 and C 4 weed interference with crop species differently, with C 3 weeds benefiting more from elevated [CO 2] (eCO 2) than C 4 species. Our aim was to quantify impacts of eCO 2 on C 3 and C 4 weeds at three levels of biological organisation: individual, population and community. We conducted a field study in 2007 and 2008 within the SoyFACE experiment in Champaign, Illinois, USA, in which Amaranthus rudis (C 4) and Chenopodium album (C 3) were grown with soyabean. This is a Free Air CO 2 Enrichment (FACE) experiment. Elevated [CO 2] influenced weeds at all levels of biological organisation. However, community-level impacts were largest. Interference by A. rudis and C. album with soyabean was 37% and 11% lower, respectively, in eCO 2. In residual weed communities under ambient [CO 2] (aCO 2), C 3 and C 4 species were equally likely to dominate the community, whereas in eCO 2, there was a 90% chance of community dominance by C 3 species. Future investigations of weed ecology and global change under FACE conditions may improve their inference space by including sources of environmental stress such as ozone, heat and drought. 2012. This article is a US Government work and is in the public domain in the USA.

Original languageEnglish (US)
Pages (from-to)277-285
Number of pages9
JournalWeed Research
Volume52
Issue number3
DOIs
StatePublished - Jun 1 2012

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weed
weeds
soybeans
air
experiment
Amaranthus tuberculatus
Chenopodium album
environmental stress
global change
ozone
drought
ecology
heat
crop
crops

Keywords

  • Amaranthus rudis
  • C and C photosynthesis
  • Chenopodium album
  • Demography
  • Free Air CO Enrichment
  • Glycine max
  • Growth analysis

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Agronomy and Crop Science
  • Plant Science

Cite this

Weed interference with field-grown soyabean decreases under elevated [CO 2] in a FACE experiment. / Davis, Adam; Ainsworth, Elizabeth.

In: Weed Research, Vol. 52, No. 3, 01.06.2012, p. 277-285.

Research output: Contribution to journalArticle

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