Established native perennial grasses out-compete an invasive annual grass regardless of soil water and nutrient availability

Christopher M. McGlone, Carolyn Hull Sieg, Thomas E Kolb, Ty Nietupsky

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Competition and resource availability influence invasions into native perennial grasslands by non-native annual grasses such as Bromus tectorum. In two greenhouse experiments we examined the influence of competition, water availability, and elevated nitrogen (N) and phosphorus (P) availability on growth and reproduction of the invasive annual grass B. tectorum and two native perennial grasses (Elymus elymoides, Pascopyrum smithii). Bromus tectorum aboveground biomass and seed production were significantly reduced when grown with one or more established native perennial grasses. Conversely, average seed weight and germination were significantly lower in the B. tectorum monoculture than in competition native perennial grasses. Intraspecific competition reduced per-plant production of both established native grasses, whereas interspecific competition from B. tectorum increased production. Established native perennial grasses were highly competitive against B. tectorum, regardless of water, N, or P availability. Bromus tectorum reproductive potential (viable seed production) was not significantly influenced by any experimental manipulation, except for competition with P. smithii. In all cases, B. tectorum per-plant production of viable seeds exceeded parental replacement. Our results show that established plants of Elymus elymoides and Pascopyrum smithii compete successfully against B. tectorum over a wide range of soil resource availability.

Original languageEnglish (US)
Pages (from-to)445-457
Number of pages13
JournalPlant Ecology
Volume213
Issue number3
DOIs
StatePublished - Mar 2012

Fingerprint

Bromus tectorum
plant available water
nutrient availability
soil nutrient
water availability
soil nutrients
soil water
grass
grasses
Pascopyrum smithii
Elymus elymoides
seed productivity
resource availability
seed production
seed
reproductive potential
intraspecific competition
interspecific competition
aboveground biomass
monoculture

Keywords

  • Bromus tectorum
  • Competition
  • Greenhouse
  • Nitrogen
  • Phosphorus
  • Water availability

ASJC Scopus subject areas

  • Ecology
  • Plant Science

Cite this

Established native perennial grasses out-compete an invasive annual grass regardless of soil water and nutrient availability. / McGlone, Christopher M.; Sieg, Carolyn Hull; Kolb, Thomas E; Nietupsky, Ty.

In: Plant Ecology, Vol. 213, No. 3, 03.2012, p. 445-457.

Research output: Contribution to journalArticle

McGlone, Christopher M. ; Sieg, Carolyn Hull ; Kolb, Thomas E ; Nietupsky, Ty. / Established native perennial grasses out-compete an invasive annual grass regardless of soil water and nutrient availability. In: Plant Ecology. 2012 ; Vol. 213, No. 3. pp. 445-457.
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