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21 Cards in this Set
- Front
- Back
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purpose of the experiment
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characterize the soil parameters in the wetland and
determine whether the soil qualities indicate that hydric soils are present |
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soil
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a collection of natural bodies (mineral and organic) that support or are capable of supporting land plants
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upper limit of soil
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air above ground
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lower limit of soil
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the bedrock level
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hydric soils
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generally type of soil in wetlands
have standing water at or near the surface for extended periods during the growing season |
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hydrophytes
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water-loving plants
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Main features that influence the quality of soils
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topography
climate parent materials depth of soil horizons biota |
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how climate affects soil
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through humidity
how much rainfall area receives water fall from rainfall |
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parent material
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clay, silt, and sand
soils may also contain organic matter, and perhaps stones and rocks |
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in Texas soil contains large _______ component
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clay
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Horizons
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layers of soil, made up of organic material and mineral matter
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A-horizon
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top soil where organic material is still being added to the mineral part of the soil
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B-horizon
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subsoil
maximum accumulation of materials lower organic content than A-horizon |
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C-horizon
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unconsolidated parent material that has not yet been weathered enough to belong to the B-horizon
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Biota
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refers to the contribution of vegetation:
contributing organic matter; influencing how water flows through the wetland, where it flows freely and where it begins to collect |
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what three things are we analyzing?
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color
texture chemistry |
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color
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can be an idicator of the quantity of each parent material and its wtaer-holding ability
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gleyed soils
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- generally hydric soils are
- partially determined from Munsell Soil Color Chart |
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Munsell Soil Color Chart
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the international standard for identifying soil color
measures: - hue (wavelenght of color) - value (lightness or darkness) - chroma (purity of the color) ~ values generally perceived to be one of the best ways to assess soil color |
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two methods of determining soil texture
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- USDA soil texturing flow chart
- mixing the soil with distilled water and separateing the particle fractions by allowing the soil to settle |
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soil chemistry determined by:
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the quantity of moisture in the soil
the pH of the soil |
