Establishment of a native bunch grass and an invasive perennial on disturbed land using straw-amended soil.

摘要: Native grasslands around the word face increased threats from non-native species. Fescue prairie in North America, good rangeland condition, is dominated by perennial bunch grass, Festuca hallii, whereas disturbances are often colonized Poa pratensis, an introduced rhizomatous grass which competitive nitrogen rich soils. F. hallii thrives typical low grassland soils and recovers poorly once disturbed. Disturbance to soil caused well site construction may decrease organic carbon potassium, increase nitrogen, phosphorus, pH electrical conductivity, creating conditions conducive invasion P. pratensis. This research tested hypothesis that would tolerate depleted soil, through addition of as a straw amendment newly reclaimed sites, better than Our second was negatively affected disturbed pratensis not. We treated three sites with rates, seeded monocultures monitored establishment over years. biomass, root leaf length cover response treatments, showed little response. positively prior-year water, current-year ammonium potassium. potassium nitrate. responded higher conductivity found poorly. The positive relationship above 7 could explain why it can invade grassland; negative reaction might its failure recover. concluded possible solution poor hallii.