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may include stratified layers with sandy loam, sand, or coarse sand with varying amounts of rock fragments. Rock <br /> fragments range from 0 to 35 percent in the underlying material. Soils in this site typically have free carbonates at <br /> the surface, but some soils may be leached from 4 to 10 inches. These soils are saline and alkaline. The high levels <br /> of salinity adversely affects plant species composition and growth. These soils are susceptible to erosion by water <br /> and wind. <br /> Surface soil structure is typically granular, and structure below the surface is subangular blocky, but may include <br /> massive or single-grain. Soil structure describes the manner in which soil particles are aggregated and defines the <br /> nature of the system of pores and channels in a soil. Together, soil texture and structure help determine the ability <br /> of the soil to hold and conduct the water and air necessary for sustaining life. <br /> Major soil series correlated to this ecological site include: Apishapa, Las (saline), Loveland, and Wann (saline) <br /> Other soil series that have been correlated to this site, but may eventually be re-correlated include: Alda variant, <br /> Aquolls, Fluvaquents, Las, Nunn (wet), Nunn (water table), Wann, Heldt (saline), and Limon (saline) <br /> *Feature listed in "( )" relates to the salt content or the wetness of the soil. <br /> The attributes listed below represent 0-40 inches in depth or to the first restrictive layer. <br /> Note: Revisions to soil surveys are on-going. For the most recent updates, visit the Web Soil Survey, the official site <br /> for soils information: http://websoilsurvey.nres.usda.gov/app/WebSoilSurvey.aspx. <br /> The attributes listed below represent 0-40 inches in depth or to the first restrictive layer. <br /> Table 4. Representative soil features <br /> Surface texture (1) Loam <br /> (2) Clay loam <br /> (3) Fine sandy loam <br /> Drainage class Poorly drained to somewhat poorly drained <br /> Permeability class Slow to moderate <br /> Soil depth 80 in <br /> Surface fragment cover<=3" 0% <br /> Surface fragment cover>3" 0% <br /> Available water capacity 3-6.5 in <br /> (0-40in) <br /> Calcium carbonate equivalent 0-10% <br /> (0-40in) <br /> Electrical conductivity 2-16 mmhos/cm <br /> (0-40in) <br /> Sodium adsorption ratio 5-30 <br /> (0-40in) <br /> Soil reaction (1:1 water) 7.4-9 <br /> (0-40in) <br /> Subsurface fragment volume <=3" 0-35% <br /> (Depth not specified) <br /> Subsurface fragment volume >3" 0% <br /> (Depth not specified) <br /> Ecological dynamics <br /> The information in this ESD, including the state-and-transition model diagram (STM), was developed using <br /> archeological and historical data, professional experience, and scientific studies. The information is representative <br />