![]() ![]() It is also disrupted by physical or faunal processes, including tree blowdowns, mass movement of soil downslope and burrowing animals (especially earthworms). ![]() It also has visible effervescence when dilute HCl is added indicating the presence of calcium carbonate.Īhu: This A horizon is enriched with organic matter that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. And it is affected by cryoturbation, made apparent by a disrupted and broken horizon, incorporation of materials from other horizons, and mechanical sorting in at least half the pedon.Īhk: An A horizon enriched with organic matter that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. It has dull, grayish colors (chroma usually ≤ 2) and/or prominent mottling within 50 cm of the soil surface, indicating permanent or periodic intense reduction. Therefore, it is enriched with organic matter that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. It has also undergone eluviation of clay, Fe, Al and/or organic matter as evidenced, under natural conditions, by streaks and splotches of different shades of gray and often by platy structure.Īhgy: An A horizon dominantly affected by surface vegetation, frequent saturation and cold temperatures. Burial may occur by mass wasting of soil downslope, intermittent flooding or deposition of air-borne material.Īhe: This A horizon is enriched with organic matter that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. Some Ah horizons satisfy the criterion for "f" but are not designated this suffix.Īhb: A buried A horizon enriched with organic matter that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. Disruption due to physical and faunal activities includes tree blowdowns, mass movement of soil on slopes, and burrowing animals (particularly earthworms).Īh: An A horizon enriched with organic matter, that is darker (has a color value at least one unit lower than the original parent material) and/or has 0.5% more organic C than IC. When dry, it is usually lighter colored (higher in color value by one or more units) than an underlying B horizon. It is characterized by the eluviation of clay, Fe, Al, or organic matter alone or in combination. ![]() When dry, it is usually lighter colored (higher in color value by one or more units) than an underlying B horizon.Īeu: An A horizon dominantly affected by eluviation and physical or faunal processes. Secondary features include the presence of faint to distinct mottles within 50 cm of the soil surface.Īej: It denotes an eluvial horizon that is thin, discontinuous, or slightly discernible. It has dull, grayish colors (chroma usually ≤ 2) and/or prominent mottling within 50 cm of the soil surface, indicating permanent or periodic intense reduction.Īegj: An A horizon dominantly characterized by the eluviation of clay, Fe, Al, or organic matter alone or in combination. When dry, it is usually lighter colored (higher in color value by one or more units) than an underlying B horizon.Īeg: An A horizon characterized by the eluviation of clay, Fe, Al, or organic matter alone or in combination. The A horizon features are dominant over B horizon features.Īe: An A horizon characterized by the eluviation of clay, Fe, Al, or organic matter alone or in combination. The dominant horizon is listed first.ĪBgj: An AB horizon characterized by faint to distinct mottling within 50 cm of the soil surface. ![]() It forms at or near the surface in the zone of leaching or eluviation of materials in solution or suspension, or of maximum in situ accumulation of organic matter or both.ĪB or BA: A transitional layer than shows characteristics of both A and B horizons. A: An A horizon is a mineral horizon meaning it contains ≤ 17% organic C (about 30% organic matter) by weight. ![]()
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