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Prescribed Burning as a Restoration Tool

Background As fire ecology research matures, interactions among fire, smoke, seeds, plant growth, and soil have been revealed to be exceedingly complex, often perplexing. A sampling of recent research emphasizes this complexity. Germination of Nicotiana attenuata after wildfire is controlled by both smoke-derived cues (+) and destruction of inhibitory signals in unburned litter (-) (Preston and Baldwin, 1999). Firenutrient interactions influence quality and quantity of browse (Rundel P W, et. al, 1980). Charcoal from forest fires reduces phytotoxic compounds; effect may last 100 years (Zackrisson, et al, 1996). Picogram amounts of unknown compound in smoke separated by gas chromatography stimulates germination of Nicotiana attenuate (Baldwin et al., 1994). Oxides of nitrogen in smog stimulate germination of particular chaparral species. These compounds are also found in smoke from burning vegetation. Smog may untimely cue germination and alter species composition (Keeley and Fotheringham, 1997). Compared to the control, seeds of several range grasses treated with smoke from burning sagebrush grew faster and had greater plant mass (Blank and Young, 1998).