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Shannock Soils

Soil Map Unit Description from the RI Soil Survey Report

Sn—Shannock, fine sandy loam .

Link to Official Soil Series Description for Shannock Soils

This subaqueous soil is on lake beds and shorelines of freshwater lakes, ponds, and reservoirs. Shannock soils are formed in recent lacustrine sediments over glacial lacustrine or glacial fluvial material. Mapped areas are irregular in shape and range from 1 to 140 hectares (2 to 350 acres). Slope ranges from 0 to 3 percent.

Typically, this soil has a black or dark gray sand or sandy loam surface layer, 20 to 80 cm thick. The substratum is very dark gray, gray, or grayish brown silt loam, sandy loam, loamy sand, or sandy glacial deposits.

This soil is permanently submerged with up to 3 meters of fresh water. All horizons have a pH of less than 6.0. Phosphorus concentration in the upper 10 cm ranges from 39.2 to 309.4 ppm with a mean of 180.8 ppm. Carbon pools in the upper meter of Shannock soils range from 57 to 352 Mg C ha-¹with a mean of 206 Mg C ha-¹.

Included with this soil in mapping are small areas of Aquapaug and Burlingame soils in areas with less organic matter in the surface layers. Small areas of Wickford and Tuckertown soils may also be included in areas where organic layers overlie glacial parent materials below. Included areas make up about 15 percent of this map unit.

Fishing and recreational boating are common in the areas within this map unit. Most areas are vegetated with native and invasive submerged aquatic vegetation including white pond lily, yellow pond lily, bladderwort, floating hearts, variable pondweed, and variable milfoil.

 

Right: Profile of a Shannock Soil

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