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LANDFIRE Biophysical Setting Model Biophysical Setting 0610980 California Montane Woodland and Chaparral

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LANDFIRE Biophysical Setting Model Biophysical Setting 0610980 California Montane Woodland and Chaparral LANDFIRE Biophysical Setting Model Biophysical Setting 0610980 California Montane Woodland and Chaparral This BPS is lumped with: This BPS is split into multiple models: General Information Contributors (also see the Comments field) Date 6/13/2004 Modeler 1 Neil Sugihara [email protected] Reviewer Hugh Safford [email protected] Modeler 2 Joe Sherlock [email protected] Reviewer Modeler 3 Ayn Shlisky [email protected] Reviewer Vegetation Type Dominant Species Map Zone Model Zone ARPA6 Upland Shrubland 6 Alaska Northern Plains CECO California N-Cent.Rockies General Model Sources QUVA Great Basin Pacific Northwest Literature CEIN3 Great Lakes South Central Local Data Hawaii Southeast Expert Estimate Northeast S. Appalachians Southwest Geographic Range Montane chaparral is located from the Southern Cascades, through the Sierra Nevada, the Peninsular and Transverse Ranges and into Baja CA. Biophysical Site Description Primarily occurs at elevations where much of the precipitation occurs as snowfall above 1500m (4500ft). These locations are commonly on steep, exposed slopes with rocky or shallow soils, favoring south and west aspects in canyons, glaciated landscapes, recent volcanics and other areas with low site productivity/ shallow soils. Vegetation Description These are mosaics of woodlands with chaparral understories, shrub-dominated chaparral, or short-lived chaparrals with confier species invading if good seed source is available. Shrubs will often have higher densities than the trees which are more limited due to the rocky/thin soils. These can also be short duration chaparrals in previouslt forested areas that have experienced crown fires. Trees tend to have a scattered open canopy, or can be clustrered, over a usually continuous dense shrub layer. Trees can include PINJEF, ABICON, ABIMAG, PINMONTICOLA, PINLAM, Pinus coulteri, Pinus attenuata, Cupressus forbesii, Cupressus arizonica, Cupressus arizonica ssp. nevadensis (=Cupressus nevadensis). Typical sclerophyllous chaparral shrubs include Arctostaphylos nevadensis, Arctostaphylos patula, Arctostaphylos glandulosa, Ceanothus cordulatus, Ceanothus diversifolius, Ceanothus pinetorum, and Chrysolepis sempervirens (=Castanopsis sempervirens). Some stands can be dominated by winter deciduous shrubs, such as PRUEMA, PRUVIR, Ceanothus integerrimus, HOLDIS, HOLMIC, QUEGARB. Most chaparral species are fire-adapted, resprouting vigorously after burning or producing fire-resistant seeds. Occurrences of this system likely shift across montane forested landscapes with catastrophic fire events. **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. Friday, January 24, 2014 Page 1 of 5 Disturbance Description Stand replacing fires occur mostly in the shrub dominated stages. In the conifer dominated late seral closed stage surface fire is also important. MFRI is generally greater than that of the surrounding forested landscape (including the lower elevation CA Mesic Chaparral - 031097) - perhaps double (Nagel and Taylor, in press) - due to the lack of flammability of many young shrub fields without a long history of fuel accumulation. Adjacency or Identification Concerns This includes several types of montane shrublands on sites that are typically seral to conifers. Montane chaparral is usually embedded within mixed conifer, red fir, white fir, Jeffrey pine, and other conifer forests on sites that are prone to stand replacing fire, or on otherwise disturbed or more open sites. Native Uncharacteristic Conditions Shrub caonopy closure in Class A won't exceed 70%, but in later stages, it could. Trees overtop the shrubs in classes B and C. The mid-open stands will have at least 10%, but not more than 50% canopy closure of trees. The range of canopy closure for trees in class C will exceed 20%, but less than 80%. Class C could also include canopy closure up to 80% of trees <25m. Shrub canopy closure for classes B and C is in the range of 40-90%. Tree canopy closure in excess of 80% would be uncharacteristic. Scale Description Montane chaparral typically originates following large stand replacing fires in conifer forests. A variety of montane shrubs occupy the site and limit establishment and growth of conifers. If these shrublands burn again before succession to late seral closed forest, they can stay shrub dominated for long periods of time (centuries). Patch size can be quite large, especially in the northern part of the state. Issues/Problems Not sure about historic composition of seral stages. System described over broad area on east and west side of Sierras. It also occurs elsewhere, however, most literature summarized is characteristic of the Sierra Nevada range. Reviewers have commented that this vegetation type is usually seral to mixed conifer types, and so a BpS model would only apply where it is unlikely to succeed to conifers. Comments This model was derived from RA model R2CHAPmn (then R1CHAPmn) and modified by John Foster (08/28/05) for BpS 031098 and 061098. Model evolution comments from the R1CHAPmn model description state that: this model may be redundant with the mixed conifer models (i.e., dominant species in classes B and C are all trees, not shrubs), and could be captured within Vegetation Class A of the mixed conifer, red fir/ white fir, and the red fir/w white pine models, by including shrub species in the descriptions. This issue needs to be rectified when the first draft RA map is constructed, and relationships between forest and montane chaparral PNVGs can be assessed. As modeled, it's possible that montane chaparral could be mapped as a PNVG only in areas where it does not turn into forest with lack of fire and succession. Would this be hard to map? What Shlisky tried with the model: 1) class D (forest) from original model deleted, and reference % of old class D combined with new class C, and 2) surface fire removed and replaced by mixed fire (no surface fire expected in this type). Lots of fire may not necessarily lead to a persistent shrub field except on steep, especially s-facing slopes(?). On thinner soils at higher elevation, fire is not necessary to perpetuate shrubs - trees don't grow there for other reasons. **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. Friday, January 24, 2014 Page 2 of 5 Vegetation Classes Indicator Species and Structure Data (for upper layer lifeform) Class A 25 % Canopy Position Min Max Early Development 1 All Structure ARPA6 Cover 070%% Upper Layer Lifeform Low-Mid Height Shrub 0m Shrub >3.1m Herbaceous CECO Tree Size Class Pole 5-9" DBH Low-Mid Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model QUVA Middle CEIN3 Description Low-Mid Early succession, after large patches of stand replacement fire. Comprised of grass, shrubs, and few tree seedlings to saplings. Prunus emarginata also common. Shrub cover can range up to 70% canopy closure. This class endures for about 30yrs before succeeding to class B. Replacement fire will reset it to the beginning. Indicator Species and Structure Data (for upper layer lifeform) 30 % Class B Canopy Position Min Max Mid Development 1 Open PIPO Cover 11%% 50 Upper Layer Lifeform Upper Height Tree 0m Tree 25m Herbaceous PSME Tree Size Class Large 21-33"DBH Upper Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model ABCO Mid-Upper ABMA Description Mid-Upper Open or closed shrublands with scattered pole to medium sized conifers. Jeffrey pine, ponderosa pine, white fir, red fir, sugar pine, Douglas-fir, incense cedar and lodgepole pine can occur. Prunus emarginata also common. Above listed shrubs co-occur. This class succeeds to class C after about 50yrs (80yrs old). Replacement fire (MFRI=100yrs) resets to class A, more frequent mixed severity fires (MFRI=40yrs) maintain it in class B. Indicator Species and Structure Data (for upper layer lifeform) Class C 45 % Canopy Position Min Max PIJE Late Development 1 Open Cover 21%% 80 Upper Height Tree 25.1m Tree 50m Upper Layer Lifeform PSME Tree Size Class Very Large >33"DBH Herbaceous Upper Upper layer lifeform differs from dominant lifeform. Shrub ABCO Fuel Model Tree Mid-Upper ABMA Mid-Upper Description Open or closed shrublands with scattered large and very large sized conifers, and sometimes medium and **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. Friday, January 24, 2014 Page 3 of 5 small sized shade tolerant conifers. Tree cover greater than 35% can occur in small to moderately sized patches on north aspects and lower slope positions. Jeffrey pine, ponderosa pine, white fir, red fir, sugar pine, Douglas-fir, incense cedar and lodgepole pine can occur. Prunus emarginata also common. Above listed shrubs still present. Stands could endure in this class except that replacement fires (MFRI=100yrs) move stands to class A. Mixed severity fires (MFRI=40yrs) maintain the stand in this relatively open Class C. Indicator Species and Class D 0 % Canopy Position Structure Data (for upper layer lifeform)
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