| grassland fires may favor native over introduced plants by reducing pathogen loads. | grasslands have been lost and degraded in the united states since euro-american settlement due to agriculture, development, introduced invasive species, and changes in fire regimes. fire is frequently used in prairie restoration to control invasion by trees and shrubs, but may have additional consequences. for example, fire might reduce damage by herbivore and pathogen enemies by eliminating litter, which harbors eggs and spores. less obviously, fire might influence enemy loads differently for n ... | 2014 | 25163122 |
| effects of low levels of herbicides on prairie species of the willamette valley, oregon. | the relative sensitivity of 17 noncrop plant species from oregon's willamette valley was determined in response to glyphosate, tribenuron methyl (tribenuron), and fluazifop-p-butyl (fluazifop) herbicides. for glyphosate, elymus trachycaulus, festuca arundinacea, madia elegans, potentilla gracilis, and ranunculus occidentalis were the most sensitive species, based on a concentration calculated to reduce shoot dry weight by 25% (ic25 values) of 0.02 to 0.04 × a field application rate of 1112 g act ... | 2013 | 23881750 |
| abiotic constraints on the competitive ability of exotic and native grasses in a pacific northwest prairie. | in prairie ecosystems, abiotic constraints on competition can structure plant communities; however, the extent to which competition between native and exotic plant species is constrained by environmental factors is still debated. the objective of our study was to use paired field and greenhouse experiments to evaluate the competitive dynamics between two native (danthonia californica and deschampsia cespitosa) and two exotic (schedonorus arundinaceus and lolium multiflorum) grass species under v ... | 2008 | 18030496 |