Early postfire revegetation in a western Montana douglas-fir forest earlypostfirerev319cran Year: 1983 Table 8.—Ravine cover and volume means for ravine stands. Stands 7, 10, and 14 were not visited in all years and are not included in the means Cover Volume 1978 1979 1982 1978 1979 1982 Percent or m^ ha ha- Shrub*?' Acer glabrum Amelanchier ainifolia Physocarpus malvaceus Rubus parviflora Spiraea betulifolia Symphoricarpos albus 36
Early postfire revegetation in a western Montana douglas-fir forest earlypostfirerev319cran Year: 1983 Table 8.—Ravine cover and volume means for ravine stands. Stands 7, 10, and 14 were not visited in all years and are not included in the means Cover Volume 1978 1979 1982 1978 1979 1982 Percent or m^ ha ha- Shrub*?' Acer glabrum Amelanchier ainifolia Physocarpus malvaceus Rubus parviflora Spiraea betulifolia Symphoricarpos albus Vaccinium globulare .5 .4 — .1 .1 Total shrubs Herbs: Seeded grasses Agropyron trichoptiorum .1 .6 .1 .7 Bromus inermis .1 .5 .8 V .3 .5 Dactylis glomerata Festuca arundinacea .1 7 ./ 1 — — — Total seeded grass Other Heros Aster conspicuus .6 .9 .6 Calamagrostis rubescens A A Galium triflorum .5 .3 .5 .1 Mitella stauropetala .4 T .1 .1 Osmorhiza ctiilensis T .3 .4 T Total herbs2 Total vascular plants = trace. 2May Include shrubs under 5 dm tall with less than one-sixth cover in individual plots. ravines the relationship between burn severity and moisture was of particular importance. In the moist, lower ravines where the fire was severe enough to com- pletely expose minereil soil, the seeded grasses exhibit high cover and volume (fig. 10). In microsites where the ravine was wettest, the fire effects were minimal. In these latter areas natural revegetation by the ground layer plants and the presence of unburned duff prevented establishment of seeded grasses on the ravine floor. In steeper, drier ravines the seeded grass either established well, but did not attain the height or cover in comparison to the moist areas, or was absent altogether. Table 9 compares stand
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