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LANDFIRE Biophysical Setting Model

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LANDFIRE Biophysical Setting Model LANDFIRE Biophysical Setting Model Biophysical Setting 3415042 Chihuahuan-Sonoran Desert Bottomland and Swale Grassland - Alkali Sacaton This BPS is lumped with: This BPS is split into multiple models:This BpS has been split into a Tobosa Grassland (BpS 2615041) and an Alkali Sacaton (BpS 2615042) system. These types are distinguished by species composition which is driven by soil salinity. The Alkali Sacaton is related to drainages whereas the Tobosa grassland is typically found in topographic low areas with clay soils, not necessarily in drainage systems. General Information Contributors (also see the Comments field) Date 9/7/2006 Modeler 1 Bonnie Warnock [email protected] Reviewer Modeler 2 John Karges [email protected] Reviewer Modeler 3 Lee Elliott [email protected] Reviewer Vegetation Type Dominant Species Map Zone Model Zone SPAI Wetlands/Riparian 34 Alaska Northern Plains SPWR2 California N-Cent.Rockies General Model Sources PLMU3 Great Basin Pacific Northwest Literature PAOB Great Lakes South Central Local Data Hawaii Southeast Expert Estimate Northeast S. Appalachians Southwest Geographic Range Tularosa Basin, Jornada Basin, south of Interstate 10, northwest of Lordsburg, southeast NM, and extending into southeast AZ, in localized settings. In TX this type extends throughout Trans-Pecos, including north of IH-10. Generally associated with flats, swales, bottomlands and cienegas. Biophysical Site Description Desert grassland with extensive clay-loam to loamy, sometimes alkaline, bottomland plains and intermittently flooded swales and cienegas associated with springs (cienegas are minor component of this system). This may also include sub-irrigated alluvial valley sites. Vegetation Description Typically dominated by alkali or giant sacaton (Sporobolis spp), Alkali sacaton (Sporobolus airoides) is often associated with more alkaline and poorly drained areas, and giant sacaton (Sporobolus wrightii) with less alkaline and better drained areas. Other codominants are tobosa (Pleuraphis muticus) and vine mesquite (Panicum obtusum). Within this system, on wetter sites, areas dominated by saltgrass (Distichlis spicata) may occur. Even wetter sites adjacent to cienega springs may be dominated by threesquare (Schoenoplectus americana) and alkali yellowtops (Flaveria campestris). Generally, the shrub cover is less than five percent. Shrub species present may include honey mesquite (P. glandulosa), catclaw mimosa (M. biuncifera) and lotebush (Z.obtusifolia). **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, April 03, 2014 Page 1 of 7 Disturbance Description Periodically flooded to permanently saturated soils. This type has a high fuel load and is more likely to carry fire than surrounding types. Without fire the stands may become decadent. Bare patches can increase with drought and lack of fire (due to senescent grasses). Drought and lack of fire may enable potential shrub invasion honey mesquite (Prosopis glandulosa), catclaw mimosa (Mimosa biuncifera) and lotebush (Ziziphus obtusifolia). Adjacency or Identification Concerns This system may not have obligate riparian species present as a true wetland. The MZ26 modelers are treating the system as including alkali sacaton flats associated with riparian systems, such as along the Pecos River, Rio Grande and short perennial braided marshes. Native Uncharacteristic Conditions Expansion of mesquite. Scale Description This type is concentrated in broad valley bottoms of southern NM and southeast AZ, Trans-Pecos Texas and in localized and linear drainage settings and flats. Issues/Problems Today, tamarisk infestation is a serious problem in some situations. Reduced groundwater outflow may be detrimental to maintenance of hydrologic regime necessary to maintain the system. Comments Mapped in BpS so copied from MZ26 by M.H. Weber at MFSL on 8/7/07. Lynn Loomis ([email protected]), a MZ26 modeler, suggests that this may also be a one-box model. The mesquite canopy (current class C) may not have occurred historically without grazing pressure to allow shrub invasion. The one box model would just have fire as a maintenance process occurring at an interval of 5-10yrs. Vegetation Classes Indicator Species and Structure Data (for upper layer lifeform) Class A 65 % Canopy Position Min Max Early Development 1 Open SPAI Cover 080%% Upper Layer Lifeform Lower Height Herb 0m Herb 1.0m Herbaceous SPWR2 Tree Size Class None Lower Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model Lower Description Lower Early seral stage with vigorous growth in grass species. This stage lasts for 20yrs. Replacement fire occurs every 10yrs and resets age to zero. **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, April 03, 2014 Page 2 of 7 Indicator Species and Structure Data (for upper layer lifeform) 10 % Canopy Position Class B Min Max Mid Development 1 Open SPAI Cover 020%% Upper Layer Lifeform Lower Height Shrub 0m Shrub 1.0m Herbaceous SPWR2 Tree Size Class None Lower Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model PRGL2 Middle MIACB Description Middle As a mature stand these grasses will become decadent. This stage lasts 21-999yrs, with replacement fire every 20yrs returning site to class A. In the absence of fire for 30yrs, alternate sucession causes a transition to class C. Indicator Species and Structure Data (for upper layer lifeform) Class C 25 % Canopy Position Min Max SPAI Mid Development 2 Open Cover 060%% Lower Height Shrub 1.1m Shrub >3.1m Upper Layer Lifeform SPWR2 Tree Size Class None Herbaceous Lower Upper layer lifeform differs from dominant lifeform. Shrub PRGL2 Fuel Model Tree Mid-Upper MIACB Middle Description Sparse mesquite (Prosopis glandulosa) canopy at three meters in height with a dense graminoid cover of sacaton (Sporobolus spp). When Prosopis gets to a certain height it escapes fire effects and becomes an almost permanent sparse canopy. Replacement fire occurs infrequently (every 500yrs) and takes this back to class A. Also returning this class to A would be flooding which kills the Prosopis overstory (every 50yrs). Surface fire in this type, every 20yrs, maintains the grassland understory but does not remove the Prosopis canopy. Indicator Species and Class D 0 % Canopy Position Structure Data (for upper layer lifeform) Min Max [Not Used] [Not Used] Cover %% Upper Layer Lifeform Height Herbaceous Tree Size Class Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model Description **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, April 03, 2014 Page 3 of 7 Class E Indicator Species and Structure Data (for upper layer lifeform) 0 % Canopy Position Min Max [Not Used] [Not Used] Cover %% Upper Layer Lifeform Height Herbaceous Tree Size Class Shrub Upper layer lifeform differs from dominant lifeform. Tree Fuel Model Description Disturbances Fire Intervals Fire Regime Group**: II Avg FI Min FI Max FI Probability Percent of All Fires Replacement 15 0.06667 82 Historical Fire Size (acres) Mixed Avg 0 Surface 70 0.01429 18 Min 0 All Fires 12 0.08096 Max 0 Fire Intervals (FI): Fire interval is expressed in years for each fire severity class and for all types of fire Sources of Fire Regime Data combined (All Fires). Average FI is central tendency modeled. Minimum and Literature maximum show the relative range of fire intervals, if known. Probability is the inverse of fire interval in years and is used in reference condition modeling. Percent of all Local Data fires is the percent of all fires in that severity class. Expert Estimate Additional Disturbances Modeled Insects/Disease Native Grazing Other (optional 1) Wind/Weather/Stress Competition Other (optional 2) References Arno, S.F. 2000. Fire in western forest ecosystems. Pages 97-120 in: J.K. Brown and J. Kapler-Smith, eds. Wildland fire in ecosystems: effects of fire on flora. Gen. Tech. Rep. RMRS-GTR-42-vol. 2. Ogden, UT: USDA Forest Service, Rocky Mountain Research Station. 257 pp. Baker, W.L. and D J. Shinneman. 2004. Fire and restoration of pinyon-juniper woodlands in the western United States. A review. Forest Ecology and Management 189: 1-21. Barton, A.M. 2002. Intense wildfire in southeastern Arizona: transformation of a Madrean oak-pine forest to oak woodland. Forest Ecology and Management 165: 205-212. Barton, A.M. 1999. Pines versus oaks: effects of fire on the composition of Madrean forests in Arizona. Forest Ecology and Management 120: 143-156. Brown, D.E. (editor) 1982. Biotic communities -- southwestern United States and northwestern Mexico. Desert Plants 4(1-4): 1-342. Brown, J.K. and J. Kapler-Smith, eds. 2000. Wildland fire in ecosystems: effects of fire on flora. Gen. Tech. **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, April 03, 2014 Page 4 of 7 Rep. RMRS-GTR-42. vol 2. Ogden, UT: USDA Forest Service, Rocky Mountain Research Station. 257 pp. DeBano, L.F., P.F. Ffolliott, A. Ortega-Rubio, G.J. Gottfried, R.H. Hamre and C.B. Edminster (technical coordinators), Biodiversity and Management of the Madrean Archipelago: The Sky Islands of the Southwestern United States and Northern Mexico. USDA Forest Service Rocky Mountain Experiment Station General Technical Report RM-264. Dick-Peddie, W.A. 1993. New Mexico vegetation: past, present, and future. University of New Mexico Press, Albuquerque, NM. 244 pp. Ffolliott, P.F., G.J. Gottfried, D.A. Bennett, V.M.
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