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21 Cards in this Set

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