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Fire History of a Western Larch/Douglas-Fir Forest Type In

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Fire History of a Western Larch/Douglas-Fir Forest Type In Fire History of a Western LarchlDouglasFir ForestType in Northwestern Montana1 Kathleen M.Davis2 Abstract.--Mean frequencies were about 120 years for valleys and montane slopes and 150 years for subalpine slopes in this western larch/Douglas-fir forest from 1735 to 1976. Fires were small and moderately intense with occasional high intensity runs. Single burns thinned the overstory favoring mixed conifer regeneration.Multiple burns created homogeneous stands or shrubfields. INTRODUCTION Forest.3Coram provided a contiguous study unit with documented history of logging operations and fires In coniferous forests of North America fire is since the 1920's. A fire history investigation recognized as an ecological agent of change that, would be a continuation of research in this Bio- in some cases, is essential for continuation of shpere Reserve. Specific objectives of the study certain biotic communities (Muir 1901, Intermountain were: Fire Research Council 1970, Kilgore 1973, Wright l.--Field test the fire methodology that was and Heinselmam 1973). Acknowledging this as an being prepared by Arno and Sneck and develop tech- forest integral factor of some environments, Mutch (1970) niques for sampling logged areas and inesic hypothesized that floral species in a f ire- types. dependent community have flammable characteristics 2.--Determine and describe fire history through that promote fire. Features such as volatile oils, scar analysis and stand age class structure. high resin content, serotinous cones, and fibrous 3.--Interpret the role of fire using the study bark perpetuate fire as a major ecological influence. results and historical information from surrounding However, in a community-that is not fire dependent, areas. species do not display flammable characteristics. As an environmental factor, fire has direct GENERAL DESCRIPTION and indirect effects on all resources; soil, water, air, animals, vegetation, etc. Provided with fire Corain Experimental Forest was established by history information, land managers have an ecological the US Forest Service on June 21, 1933, for the pur- basis on which to suppress fires, develop fire pre- pose of studying the ecology andsilviculture of criptions, and evaluate planning alternatives in western larch (Larix occidentalis) forests. In re- order to maintain and restore natural resources. cent years, research projects have includedother Knowledge of the pattern, behavior, and effects of forest resources and ecological influences such as historic fires gives facts to develop logical re- watershed, soils, pathogens, insects, and fire. source programs. The forest is located on the Hungry Horse Ranger District of the Flathead National Forest in north- western Montana about 11 km (7 mi) south ofGlacier PURPOSE National Park and 34 km (21 mi) northeast of Kalispell, Montana. This study was undertaken to refine sampling techniques and extend fire history investigations Corain encompasses 2984 ha (7460 ft) of the in western Montana into a more mesic forest type western slopes of Desert Mountain drained byAbbott and climate than encountered by Arno (1976) in the Creek. The landform was created by glacial activity. Bitterroot Valley of the Bitterroot National Elevations rise from 1006 m (3300 ft) on Abbott Flats 1Paper presented at the Fire History Workshop. 3Fire history of Coram Experimental Forest (University of Arizona, Tucson, October 20-24, was studied as partial fulfillmentof a Master of The study was supported 1980). Science degree in 1977. with a cooperative agreement between the Research, 2Kathleen M. Davis is Plant/Fire Ecologist, Development, and Application Project, Northern Forest Western Region, National Park Service, San Fran- Fire Laboratory, US Forest Service, and Schoolof cisco, California. Forestry, University of Montana, Missoula. 69 to 1911 in (6370 ft) on the mountain top. Slopes cess of aging and correlating dates of scars and vary up to 80%. Soils are loamy-skeletal, and much identifying age classes of fire-initiated regen- of the area has a thin layer of volcanic ash just eration. below the soil surface. Transects were laid out in a network to cover Coram has a mean temperature of l6C (61F) in all elevations and aspects. They were subjectively summer and -7C (l9F) in winter, and annual pre- placed to maximize sampling obvious burns and other cipitation is about 760 mm (30 in). Seasons are areas likely to have scarred trees and regeneration, distinct. Snow may fall in early October and last such as ridges. Trees that were sampled were located until May in the high elevations. Summers are on or adjacent to the route. When a transect crossed short and cool with the most favorable fire weather a logged unit, the area was intensively and system- occurring during the driest months, July and August. atically examined in a zigzag pattern that covered Summer thunderstorms approach in the late afternoon the cut. from the southwest and are usually weakened by the time they reach the forest since they have travelled The method suggested by Arno and Sneck is a over several mountain ranges. It has been noted reconnaissance walk of the network to identify and that fewer lightning fires occur in forests of locate the best scarred trees then a second walk to northern Idaho and Montana than in forests to the collect samples. However, since trees with external south (Barrows 1951). scars were scarce and since most trees had only one scar, the plan was changed to sample from scarred This is a western larch/Douglas-fir forest trees and stumps on the first walk. type (SAP 212). Habitat types according to Pfister et a]..(1977) are Abies lasiocarpa/Clintonia Sampling procedures entailed: uniflora h.t. (subalpine fir/queen cup beadlily); l.--Describing habitat types and existing Abies lasiocarpa/Menziesia ferruginea h.t. (sub- vegetation. alpine fir/menziesia); Abies lasiocarpa/Linnaea 2.--Cutting cross sections with a chainsaw from borealis h.t. (subalpine fir/twinflower); Ahies scarred trees and stumps (or making field counts lasiocarpa/Xerophyllum tenax h.t. (subalpine fir! on stumps when unable to get a sound cut). beargrass); Pseudotsuga nenziesii/Physocarpus 3.--Coring fire-initiated regeneration to age malvaceus h.t. (Douglas-fir/ninebark); Tsuga stands. heterophylla/Clintonia uniflora h.t. (western 4.--Describing in detail all trees, stumps, and hemlock/queen cup beadlily); and Abies lasiocarpa/ regeneration sampled. Oplopanax horridum h.t. (subalpine fir/devil's club). Adjacent logged areas of the Flathead National Forest were selectively studied when it became obvious The forest canopy becomes open at high elevations that Corain's history was different from the extensive, and there are very few trees on the top of Desert stand-replacing fires reported for surrounding forests. Mountain. Here where local climate is cold, soils The purpose of examining outlying areas was to look are poorly developed, and snow lingers, vegetation for evidence of past fires in order to better under- cover is hardy perennial herbs. On lower slopes stand the history of the region and draw a comparison the forest is dense and continuous. Mixed con- for Coram. ifer stands are common but small pockets of larch, lodgepole pine (Pinus contorta), Douglas-fir, sub- Attempts were made to document each fire year alpine fir, and hemlock do occur. Spruce (Picea with a combination of cross sections, stump ring glauca x Picea engelmannii) is found in mixed stands counts, or stand age classes. For some years this mainly with Douglas-fir and subalpine fir.Ponderosa was not possible because of limited evidence. Cross pine (Pinus ponderosa), western white pine (Pinus sections were cut from lower tree trunks at a position monticola), and whitebark pine (Pinus albicaulis) to obtain the best scar and pith record. Annual rings are scarce. on unsound stumps were counted enough times to obtain a good estimate of fire scar and pith dates. Cores Light to medium fuel loadings prevail through- to age regeneration were mainly taken from seral out. Undergrowth, litter, and debris less than trees, usually larch, lodgepole, and Douglas-fir. 8 cm (3 in) diameter constitite the bulk of the In a few cases the climax species were used to age ground fuels. Heavy accumulations occur as down- stands when it was obvious they represented the im- fall where intense fires have burned or Douglas-fir mediate post fire sere. All sampling was done at bark beetle have occurred. Fuel model H is appro- approximately 0.3 m (1 ft) height to obtain more priate and depicts a situation where fires are accurate dates and standardize the information. typically slow spreading becoming intense only in scattered areas where the downed woody material is Total age for each sample was determined by concentrated (Deeming et al. 1978). adding to the pith count the estimated number of years for each species to reach 0.3 m. Throughout the study area, several seedlings of all species METHODS about 0.3 m tall were aged. This resulted in a growth factor by species for the period between germination The methodology used to investigate fire history and attaining O.3m in height. Factor for larch, in forested and logged areas is described by Arno lodgepole, ponderosa, and white pine was four years, and Sneck (1977). The techniques were a simple pro- for Douglas-fir five years, and subalpine fir, 70 whitebark pine, and spruce was six years.A ten 1602 to 1976. Fire years from 1602 to 1718 should year span was allowed as the maximum time for be considered as approximate because sample sizes establishment after fire because of the many factors were small and accuracy diminishes with time.From influencing seed germination and development. 1718 to 1976 they are probably within a year of the actual date because more evidence was available. In the laboratory, cross sections and incre- When dates are based solely on stand age classes ment cores were air dried, sanded or shaved, and they were felt to be within three to five years of examined with a binocular microscope.
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