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Ecological Site F022AE008CA Frigid Loamy Moraine Slopes

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Ecological Site F022AE008CA Frigid Loamy Moraine Slopes Natural Resources Conservation Service Ecological site F022AE008CA Frigid Loamy Moraine Slopes Accessed: 10/04/2021 General information Figure 1. Mapped extent Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated. MLRA notes Major Land Resource Area (MLRA): 022A–Sierra Nevada Mountains Major Land Resource Area 22A, Sierra Nevada Mountains, is located predominantly in California and a small section of western Nevada. The area lies completely within the Sierra Nevada Section of the Cascade-Sierra Mountains Province. The Sierra Nevada range has s gentle western slope, and a very abrupt eastern slope. The Sierra Nevada consists of hilly to steep mountains and occasional flatter mountain valleys. Elevation ranges between 1,500 and 9,000 ft throughout most of the range, but peaks often exceed 12,000 ft. The highest point in the continental US occurs in this MLRA (Mount Whitney, 14,494 ft). Most of the Sierra Nevada is dominated by granitic rock of the Mesozoic age, known as the Sierra Nevada Batholith. The northern half is flanked on the west by a metamorphic belt, which consists of highly metamorphosed sedimentary and volcanic rocks. Additionally, glacial activity of the Pleistocene has played a major role in shaping Sierra Nevada features, including cirques, aretes, and glacial deposits and moraines. Average annual precipitation ranges from 20 to 80 inches in most of the area, with increases along elevational and south-north gradients. The soil temperature regime ranges from mesic, frigid, and cryic. LRU "E" Northern Sierran Upper Montane: This LRU occurs at the mid elevations of the Sierra Nevada, from the Sonora Pass area to the higher mountains in the vicinity of Quincy. Elevations are typically between 5,500 feet to 8,500 feet, with the lower elevations typically on southern aspects, and the higher elevations on northern aspects. The frost-free season is 60 to 125 days, MAAT ranges from 40 to 50 F, and MAP ranges from 35 to 85 inches. The soil temperature regime is mostly frigid, with some cryic soil temperatures at the upper elevations and northern aspects. Soil moisture regimes are mostly xeric, but may be udic where snow persists through spring. Classification relationships Forested Communities of the Upper Montane in the Central and Southern Sierra Nevada (Potter, 1998) Red Fir- White Fir- Jeffrey Pine p. 185. Forest Alliance = Abies magnifica-Abies concolor – Red fir - White fir forest; Association = tentatively Abies magnifica-Abies concolor [Sierra Nevada]. (Sawyer, John O., Keeler-Wolf, Todd, and Evens, Julie M. 2009. A Manual of California Vegetation. 2nd ed. California Native Plant Society Press. Sacramento, California.) Ecological site concept This site occurs on east-facing aspects on moderately sloping moraine slopes at elevations ranging from approximately 6,200 to 7,500 feet. Slopes are typically between 5 and 30 percent. Soils are very deep and developed from colluvium over till from volcanic parent materials. Vegetation is a California red fir (Abies magnifica) – white fir (Abies concolor) forest. Soils have high moisture holding capacity, and roundleaf snowberry (Symphoricarpos rotundifolius) and creeping snowberry (Symphoricarpos mollis) are dominant shrubs. Moist soils support a diverse forb community, with Fendler’s meadow-rue (Thalactricum fendleri) a characteristic species. Associated sites F022AE013CA Frigid, Loamy, Volcanic Mountain Slopes Occurs on adjacent slopes with loamy, moderately deep to deep andesitic soils. The vegetation is a white fir (Abies concolor) - mixed conifer forest. R022AX107CA Frigid C Channel System This riparian complex occurs along C-B type channels with gravelly to cobbly channel substrates and 2 - 3 percent slopes. The vegetation is characterized by willow (Salix ssp.) - aspen (Populus tremuloides) - cottonwood (Populus balsamifera) communities. Similar sites F022AC008CA Cryic Volcanic Mountain Slopes This site occurs at higher elevations. The overstory is similar, but the understory is much less productive and less diverse. Pinemat manzanita (Arctostaphylos nevadensis) is the dominant understory species. F022AC003CA Frigid-Cryic Sandy Slopes This site occurs on higher elevation slopes with gravelly sandy soils over decomposed granite. Western white pine (Pinus monticola) co-dominates with California red fir (Abies magnifica), and pinemat manzanita (Arctostaphylos nevadensis) is the dominant understory species. F022AC007CA North-Facing Cryic Loamy Mountain Slopes This site occurs at higher elevations on moderately deep andic soils. Mountain hemlock (Tsuga mertensiana) co-dominates with red fir (Abies magnifica). F022AE007CA Frigid, Sandy, Moraines And Hill Slopes This site occurs on soils developed from granitic and mixed parent material, and soils have skeletal textures. Vegetation is white fir (Abies concolor) - Jeffrey pine (Pinus jeffreyi) forest. Table 1. Dominant plant species Tree (1) Abies magnifica (2) Abies concolor Shrub (1) Symphoricarpos rotundifolius (2) Symphoricarpos mollis Herbaceous (1) Thalictrum fendleri Physiographic features This ecological site occurs on moraines at elevations ranging from 6,230 to 7,450 feet. Slopes may range from 5 to 60 percent, but are typically under 30 percent. It is found on all aspects, but is generally orientated on east facing aspects. Runoff class is low to medium. Table 2. Representative physiographic features Landforms (1) Moraine Flooding frequency None Ponding frequency None Elevation 1,899–2,271 m Slope 5–60% Ponding depth 0 cm Water table depth 0 cm Climatic features The average annual precipitation ranges from 31 to 63 inches, mostly in the form of snow in the winter months (November through April). The average annual air temperature ranges from 41 to 46 degrees Fahrenheit. The frost- free (>32F) season is 40 to 90 days and the freeze-free (>28F) season is 60 to 140 days. Climate stations: (1) SO46, Fallen Leaf Lake Snotel. Period of record 1975-2003 Table 3. Representative climatic features Frost-free period (average) 65 days Freeze-free period (average) 100 days Precipitation total (average) 1,194 mm Influencing water features This ecological site is not influenced by wetland or riparian water features. Soil features The soils associated with this ecological site are very deep and formed in colluvium over till derived from volcanic rock. These soils are well drained with moderately rapid permeability. The soil moisture regime is xeric and the soil temperature regime is frigid. Surface rock fragments are generally absent. Surface textures are medial sandy loam. Partially decomposed organic matter overlies the mineral horizons (Oi horizon). Subsurface textures are medial cobbly sandy loam, cobbly sandy loam, and extremely stony coarse sandy loam.Subsurface rock fragments smaller than 3 inches in diameter average 5 percent by volume, and larger fragments average 8 percent (for a depth of 0 to 79 inches). The soils that are correlated to this ecological site are the Paige soils (Medial, mixed, frigid Humic Vitrixerands). This ecological site has been correlated with the following mapunits and soil components in the Tahoe Basin soil survey area (CA693): Musym ; MUname ; Compname ; Local_phase ; Comp_pct 7183 ; Paige medial sandy loam, 30 to 50 percent slopes ; Paige ; ; 84 7181 ; Paige medial sandy loam, 5 to 15 percent slopes ; Paige ; ; 80 7182 ; Paige medial sandy loam, 15 to 30 percent slopes ; Paige ; ; 80 7171 ; Kneeridge gravelly sandy loam, 2 to 9 percent slopes, extremely stony ; Paige ; ; 5 7172 ; Kneeridge gravelly sandy loam, well drained, 5 to 15 percent slopes, very stony ; Paige ; ; 5 7173 ; Kneeridge gravelly sandy loam, 2 to 5 percent slopes, very stony ; Paige ; ; 5 7174 ; Kneeridge gravelly sandy loam, 5 to 15 percent slopes, very stony ; Paige ; ; 5 7121 ; Ellispeak-Rock outcrop complex, 9 to 30 percent slopes ; Paige ; ; 2 7231 ; Waca very gravelly medial coarse sandy loam, 9 to 30 percent slopes ; Paige ; ; 2 7232 ; Waca very gravelly medial coarse sandy loam, 30 to 50 percent slopes ; Paige ; ; 2 7233 ; Waca very gravelly medial coarse sandy loam, 50 to 70 percent slopes ; Paige ; ; 2 7122 ; Ellispeak-Rock outcrop complex, 30 to 50 percent slopes ; Paige ; ; 1 7123 ; Ellispeak-Rock outcrop complex, 50 to 70 percent slopes ; Paige ; ; 1 Table 4. Representative soil features Parent material (1) Ablation till–volcanic breccia Surface texture (1) Medial sandy loam Family particle size (1) Loamy Drainage class Well drained Permeability class Moderately rapid Soil depth 150–201 cm Surface fragment cover <=3" 0% Surface fragment cover >3" 0% Available water capacity 14.99–17.53 cm (0-101.6cm) Calcium carbonate equivalent 0% (0-101.6cm) Electrical conductivity 0 mmhos/cm (0-101.6cm) Sodium adsorption ratio 0 (0-101.6cm) Soil reaction (1:1 water) 5.6–7 (0-101.6cm) Subsurface fragment volume <=3" 5% (Depth not specified) Subsurface fragment volume >3" 8% (Depth not specified) Ecological dynamics Abiotic factors This site occurs on east-facing aspects on moderately sloping moraine slopes at elevations ranging from approximately 6,200 to 7,500 feet. Soils are very deep and developed from colluvium over till from volcanic parent materials. Vegetation is a California red fir (Abies magnifica) – white fir ( Abies concolor) forest. Soils have high moisture holding capacity,
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