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

Competition and resource availability influence invasions into native perennial grasslands by nonnative 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 gro...

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Veröffentlicht in:Plant ecology 2012-03, Vol.213 (3), p.445-457
Hauptverfasser: McGlone, Christopher M., Sieg, Carolyn Hull, Kolb, Thomas E., Nietupsky, Ty
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container_title Plant ecology
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creator McGlone, Christopher M.
Sieg, Carolyn Hull
Kolb, Thomas E.
Nietupsky, Ty
description Competition and resource availability influence invasions into native perennial grasslands by nonnative 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.
doi_str_mv 10.1007/s11258-011-9992-1
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subjects Aboveground biomass
Applied Ecology
Atmospheric carbon dioxide
Biodiversity
Biological competition
Biomedical and Life Sciences
Bromus tectorum
Community & Population Ecology
Competition
Ecology
Elymus elymoides
Evaluation
Germination
Grasses
Grasslands
Life Sciences
Moisture content
Monoculture
Nitrogen
Nonnative species
Nutrient availability
Perennials
Phosphorus
Plant competition
Plant Ecology
Plant production
Plant reproduction
Plants
Resource availability
Root biomass
Seed industry
Seed production
Soil moisture
Soil water
Terrestial Ecology
Water
Water availability
Water treatment
title Established native perennial grasses out-compete an invasive annual grass regardless of soil water and nutrient availability
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