Print PageFire-related cues such as smoke and heat can provide an ecological signal that previously existing plants have been cleared from the site, releasing space and nutrients for establishment of new plants. Such signals may alter the germination of some fire-adapted species. We examined the germination responses of 12 species (grasses, forbs, and shrubs) native to the Southern High Plains to smoke, heat, and their interaction, with the goal of understanding how such treatments might be used in a restoration setting. Smoke treatments were applied by soaking seeds in 1:5, 1:10, or 1:100 “Regen 2000®” smoke solution for 22 hours. Heat treatments were applied by placing seeds in a warm oven at 50°C or 80°C for 5 minutes.
Results/Conclusions
Smoke water treatment increased the germination of two species (Salvia reflexa and Gutierrezia sarothrae) and decreased the germination of two species (Coreopsis tinctoria and Digitaria ciliaris). Heat increased the germination of 1 species (Solanum eleagnifolium). The interaction of heat and smoke both enhanced and inhibited germination of two Salvia species (S. azurea and S. reflexa), depending on treatment levels. Fire-mimic treatments, such as smoke water, have potential for use as management options to target specific species in a restoration setting.
