Seedling Growth of Intermountain Perennial and Weedy Annual Grasses

Abstract

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Rhizosphere-mediated effects of the invasive grass Bromus tectorum L. and native Elymus elymoides on nitrogen cycling in Great Basin Desert soils

“…Under conditions used here, E. elymoides was much slower growing than B. tectorum, both in monoculture and mixed plantings. This may be expected given their annual versus perennial growth strategies, but is still noteworthy considering that E. elymoides is thought to be one of the more competitive native grasses in the Great Basin and therefore a good candidate for restoration projects at B. tectorum-invaded sites (e.g., Arrendondo et al 1998;Jones et al 2010). We should note that native perennial plants in the Great Basin can be good competitors against B. tectorum when they are well-established (Chambers et al 2007), and B. tectorum is more likely to inhibit the growth of seedlings than mature native plants (Humphrey and Schupp 2004).…”

Biología del pasto rosado Melinis repens (Willd.) e implicaciones para su aprovechamiento o control

“…Otros trabajos reportan para gramíneas ya desarrolladas una relación raíz parte aérea de 3 en B. gracilis y 2.5 en Hilaria mutica (45) , 4.3 en Sorghastrum nutans y 4.9 en Bouteloua curtipendula (46) y 5.5 en Sporobolus airoides, 4 en Distichlis spicata y 3 en Leymus triticoides (47) . Los valores altos representan mayor inversión de biomasa en raíces para la búsqueda de recursos (48,49) . Al comparar los valores obtenidos en el pasto rosado de la relación raíz parte aérea es importante mencionar que estos fueron obtenidos en los primeros 120 días de crecimiento.…”

“…The high values represent a higher biomass investment in roots for the search of resources (48,49) . When the values obtained for the root/shoot ratio for natal grass are compared, it is important to mention that these were obtained in the first 120 d of growth.…”

Journal of Range Management, Volume 56, Number 3 (May 2003)

“…Defining these mechanisms requires evaluation of the specific growth and/or functional traits that are altered by N availability. Do invasive annual grasses perform better than perennial grasses under high soil N availability because annuals have higher relative growth rates (Poorter et al 1990, Lambers andPoorter 1992)? Although evidence exists that demonstrates that cheatgrass and medusahead have higher relative growth rates than native perennial grasses (Arredondo et al 1998), it is unclear whether these annuals will be favored under conditions of high N availability, which has been observed for annuals in other plant communities (e.g., Aerts and Berendse 1988). Conversely, does low N availability reduce growth rates of invasive annual grasses so that relative performance of annual and perennial grasses are similar?…”