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LANDFIRE Biophysical Setting Model

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LANDFIRE Biophysical Setting Model LANDFIRE Biophysical Setting Model Biophysical Setting 0210270 Mediterranean California Dry-Mesic Mixed Conifer Forest and Woodland This BPS is lumped with: This BPS is split into multiple models: General Information Contributors (also see the Comments field) Date 7/27/2005 Modeler 1 Darren Borgias [email protected] Reviewer Modeler 2 Tim Bradley [email protected] Reviewer Modeler 3 Steve Norman [email protected] Reviewer Vegetation Type Dominant Species Map Zone Model Zone PSME Forest and Woodland 2 Alaska Northern Plains PIPO California N-Cent.Rockies General Model Sources CADE27 Great Basin Pacific Northwest Literature QUKE Great Lakes South Central Local Data PILA Hawaii Southeast Expert Estimate Northeast S. Appalachians Southwest Geographic Range This type occurs in the Klamath-Siskiyou region (CA and OR), and may extend to the west side of Mount Shasta and the upper Sacramento river; also occurs in theSW OR Cascades up to the south end of the Willamette Valley. Biophysical Site Description This type occurs on all aspects in lower montane zones (600-1800m in N-CA and S-OROregon; 1200- 2150m in S-CA). This system occurs in a variety of topo-edaphic positions, such as upper slopes at higher elevations, canyon sideslopes, ridgetops, and south- and west-facing slopes which burn relatively frequently. Vegetation Description Mixed conifer forests must have at least two codominating species, and typically have three or more species. Pseudotsuga menziesii, Pinus ponderosa, Calocedrus decurrens (CADE27) are the most common conifers. Other conifers that can occasionally be present include Pinus jeffreyi, P. attenuata, and P. lambertiana. P. lambertiana can be significant in OR. Common subcanopy trees include Quercus kelloggii and Q. chrysolepis. Arbutus menziesii commonly occurs in the northern extent and in OR. In CA, Pseudotsuga macrocarpa and Pinus coulteri can be present but are not dominant species, in this system in the south. Understory shrubs include poison oak, Ceanothus intergerrinus, C. velutinus, Arctostaphyllus viscida, Chinqapin (Chrysolepis chrysophylla), Ribes spp., Berberus aquifolium, Symphorocarpus mollis. In OR, Holodiscus discolor and Berberis spp. Can occur. Herbacewous spp are varied, but Festuca californica, **Fire Regime Groups are: I: 0-35 year frequency, surface severity; II: 0-35 year frequency, replacement severity; III: 35-100+ year frequency, mixed severity; IV: 35-100+ year frequency, replacement severity; V: 200+ year frequency, replacement severity. Thursday, January 23, 2014 Page 1 of 6 Elymus glaucus and Whipplea modesta (important in OR). Disturbance Description Fire regimes may be similar to mesic mixed conifer types (03-1028). Mean fire return intervals range from approximately 7-17yrs. Surface fires were frequent (~10yrs) and replacement fires were relatively rare. Surface fire occurs at an average generally between 10-15yrs (Taylor and Skinner 2003, Taylor and Skinner 1998, Sensenig 2002). Kilgore and Taylor (1979) reported a FRI=19-39yrs (N/NE aspects), which may favor mixed and replacement fires. Longer return intervals are possible, 70-110yrs (Frost and Sweeney, 2000). Insect/pathogen and drought-related mortality that does not cause a change in state occurs every 7-10yrs in closed states; that which causes a transition from a late-seral closed to open state occurs about every 100yrs. With historic fire regimes, insect outbreaks may have been much reduced compared to current conditions. Snow breakage occurs in the mid-seral closed state (class B) about every five years. While model is aspatial, most medium and high severity fire may actually occur on mid and upper slope positions (Taylor and Skinner 1998, Taylor 2000, Bekker and Taylor 2001). Adjacency or Identification Concerns May be adjacent to chaparral, oak woodland, and grassland types, or serpentine mixed conifer forests at lower elevations. Upper elevations defined by ecotone with mesic mixed conifer. This type is generally lower in elevation than Mediterranean California mesic mixed conifer (03-1028). When it occurs at higher elevations it is on south-facing slopes and ridges. This type is distinguishable from the mesic mixed conifer type because it lacks white fir. The western ecotone occurs with mixed evergreen forests (east of Happy Camp, middle end of Rogue River Canyon). Native Uncharacteristic Conditions Uncharacteristic density of Douglas-fir and loss of pine species due to selective logging. Some areas converted to hardwood types by historic logging, past prolonged fire free interval and subsequent severe fire. Scale Description This forest type occurs in a small to medium patch size (100-1000 acres) mosaic, driven by variations of topography, historic fire patterns, and fire intensity. May occur in patchy mosaic with chaparral and oak woodland types. Issues/Problems It is unknown if there is a need for a northern (latitude) versus a southern mixed-conifer type. This version is intended to respond to literature inferences that "north" slopes, perhaps especially in the northern Sierra Nevada through the Klamath region, have a longer fire regime and larger patch size than estimated by work in the southern and central Sierra Nevada. Likewise, the Klamath region literature also indicates that the topographic complexity also contributes to disparity between the two types. Even though a FRI difference may exist between N and S aspects, Skinner and Taylor 1998 found that the numbers were not statistically significant in their study. Difference in severity between aspects may be more important. Comments **Fire Regime Groups are: I: 0-35 year frequency, surface severity; II: 0-35 year frequency, replacement severity; III: 35-100+ year frequency, mixed severity; IV: 35-100+ year frequency, replacement severity; V: 200+ year frequency, replacement severity. Thursday, January 23, 2014 Page 2 of 6 Type was derived from CA Mixed Conifer -north slope (R1MCONns) with influence from R#MCONsw. Review at Portland meeting added MZs in OR and adjusted the species and distribution to reflect OR geography. Foster decreased the amount of mixed and surface fires in class E (keeping the same proportion) so that the cumulative fire frequency for class E matched the text provided by the modelers. The model result was to move 10% from class D to class E. Final fire regime statistics remained unchanged. Portland reviewers (Oct.2006) accepted the VDDT model from MZ03 as is. Vegetation Classes Indicator Species and Structure Data (for upper layer lifeform) Class A 10 % Canopy Position Min Max Early Development 1 All Structure PSME Cover 0%% 100 Upper Layer Lifeform Upper Height Tree 0m Tree 10m Herbaceous PIPO Tree Size Class Pole 5-9" DBH Upper Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model PILA 7 Upper Description Early succession, 0-25yrs, Vegetation comprised of grass, shrubs, and shade intolerant tree species seedlings to saplings to poles. Snags are typically present. This stage can occur as small patch (10-100 acres) within mixed severity fire, or less likely as large patches from more extensive fire (100-1000 acres). Replacement fire (MFRI=100yrs) resets to 0. Mixed fire (MFRI=15yrs) and surface fire (MFR=10yrs) also occur. If about 23yrs pass without fire, then it succeeds to class B. Indicator Species and Structure Data (for upper layer lifeform) 5 % Class B Canopy Position Min Max Mid Development 1 Closed PIPO Cover 61%% 100 Upper Layer Lifeform Upper Height Tree 10.1m Tree 25m Herbaceous PSME Tree Size Class Large 21-33"DBH Upper Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model CADE27 10 Upper QUKE Description Middle Pole to large sized conifers (up to 30in DBH) with canopy cover <60%. These stands, between 26 and 100yrs in age, develop as an alternate successional pathway in settings and climatic periods that support longer intervals between mixed severity fires. A fire free interval of about 30yrs. Crowded stands of conifers along with hardwood trees in younger stages. Douglas-fir continue to recruit below ponderosa pine and adult Douglas-fir depending on local site conditions. Ladder fuels and subcanopy low enough for crown fire initiation. Depauperate understory. Surface fuel moderate and complex. Replacement fire (MFRI=200yrs) resets to 0. Mixed fire (MFRI=100yrs) opens it up to class C, and surface **Fire Regime Groups are: I: 0-35 year frequency, surface severity; II: 0-35 year frequency, replacement severity; III: 35-100+ year frequency, mixed severity; IV: 35-100+ year frequency, replacement severity; V: 200+ year frequency, replacement severity. Thursday, January 23, 2014 Page 3 of 6 fire (MFRI=100yrs) maintains in Class B. Indicator Species and Structure Data (for upper layer lifeform) Class C 20 % Canopy Position Min Max PIPO Mid Development 1 Open Cover 21%% 60 Upper Height Tree 10.1m Tree 25m Upper Layer Lifeform PSME Tree Size Class Large 21-33"DBH Herbaceous Upper Upper layer lifeform differs from dominant lifeform. Shrub CADE27 Fuel Model Tree Upper 9 QUKE Middle Description Pole to large sized conifers (up to 30in DBH) with canopy cover averaging between 20-40%, seldom occurs as high as 60%. These stands, between 26-100yrs in age, develop as the typical successional pathway with frequent, low-mixed severity fires, Median FRI 7-17yrs. Open stands of predominately pines and Douglas-fir, with hardwood trees scattered throughout. Calocedrus decurrens can be very sparse, or quite common. Douglas-fir continues to seed in under the ponderosa pine overstory. Rich herbaceous and woody understory. Native grasses and forbs favored with frequent fires. Surface fuel light and complex. Replacement fire (MFR=200yrs) resets to 0. Mixed fire (MFR=200yrs) and surface fire (MFR=10yrs) maintain it in Class C. If about 25 years pass without fire, then it succeeds to class B. Indicator Species and Class D 40 % Canopy Position Structure Data (for upper layer lifeform) Min Max Late Development 1 Open PIPO Cover 21%% 60 Upper Upper Layer Lifeform Height Tree 25.1m Tree 50m PSME Herbaceous Tree Size Class Very Large >33"DBH Shrub Upper Upper layer lifeform differs from dominant lifeform.
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