. Age-class structure of old growth ponderosa pine/Douglas-fir stands and its relationship to fire history. Ponderosa pine Montana; Douglas fir Montana; Old growth forests Montana; Forest fires Montana. fire chronology starting in the early 1600's (except plot F-2) was developed for each plot by correlating dates obtained from individual trees. The six dry site stands occurred at relatively high elevations on moderately steep (45 to 55 percent) south-facing slopes on the Bitterroot and Lolo National Forests (fig. 1). These represent the Pinus ponderosa phase of the Pseudotsuga menziesiilCalama
. Age-class structure of old growth ponderosa pine/Douglas-fir stands and its relationship to fire history. Ponderosa pine Montana; Douglas fir Montana; Old growth forests Montana; Forest fires Montana. fire chronology starting in the early 1600's (except plot F-2) was developed for each plot by correlating dates obtained from individual trees. The six dry site stands occurred at relatively high elevations on moderately steep (45 to 55 percent) south-facing slopes on the Bitterroot and Lolo National Forests (fig. 1). These represent the Pinus ponderosa phase of the Pseudotsuga menziesiilCalamagrostis ruhescens habitat type () (Pfister and others 1977), a common dry site-type for serai ponderosa pine. The three Bitterroot National Forest plots are lo- cated within about mile of each other on a broad slope directly north of Fales Flat Campground, south- west of Darby, MT, (fig. 1). This site lies at 5,400 to 5,900 ft elevation and is near the chmatic (cold) Hmits of the ponderosa pine type, where pine/Douglas-fir gives way above to pure Douglas-fir. We located the plots within the large patches where ponderosa pine was a major component of the overstory. Analysis of multiple fire scar sequences (Amo and Sneck 1977). 50 miles Figure 1—General location of the old growth ponderosa pine/fir study plots. 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Arno, Stephen F; Scott, Joe H; Hartwell, Michael G; Intermountain Research Station (Ogden, Utah). Ogden, UT : U. S. Dept. of Agriculture, Forest Service, Intermountain Research Station
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