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NC STATE UNIVERSITY DEPARTMENT of SOIL SCIENCE. NC STATE UNIVERSITY DEPARTMENT of SOIL SCIENCE. NC STATE UNIVERSITY DEPARTMENT of SOIL SCIENCE. NC STATE UNIVERSITY DEPARTMENT of SOIL SCIENCE. Redoximorphic Features and Hydric Soils. NC STATE UNIVERSITY

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redoximorphic features and hydric soils

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redoximorphic Features and Hydric Soils

redoximorphic features

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redoximorphic Features
  • Formed by changes in redox conditions in saturated soil
  • Reduction and oxidation of C, Fe, Mn, and S compounds
  • Translocation of C, Fe, Mn, and S compounds
redox transformations

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redox Transformations

Coating of Fe2O3

Remove

Fe

Fe2+

Gray Soil

Brown Soil

Fe3+

2e- + 6H+ + Fe2O3 2Fe(II) + 3H2O

in order to form features

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

In order to form features:
  • must have anaerobic conditions (reduced and saturated)
  • must have Fe and/or Mn (electron acceptor)
  • must have microbes (bugs)
  • must have carbon (food for the bugs)
redoximorphic features1
Redoximorphic Features
  • Redox concentrations – zone where Fe - Mn oxides have accumulated
  • Redox depletions – zone where of Fe – Mn oxide have been stripped out
  • Reduced matrix – low chroma matrix that changes color when exposed to air
redox depletions fe depletions

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redox depletions (Fe depletions)

fe depletions

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Fe depletions

Fe depletion

in ped interior

Fe depletion

on ped face

Fe depletion

on pore

fe depletions1

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Fe depletions
concentrations and depletions
Concentrations and depletions

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

redox concentrations fe masses fe pore linings

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redox concentrations (Fe masses, Fe pore linings)

fe masses and fe pore linings

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Fe masses and Fe pore linings

Fe mass

in matrix

Pore lining on

root channel

Pore lining on

Ped surface

Concretion

Nodule

fe pore linings

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Fe pore linings
fe masses

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Fe masses
reduction oxidation and translocation saturation

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Reduction, oxidation and translocation = saturation
slide16

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

NC STATE UNIVERSITY

DEPARTMENT of SOIL SCIENCE

Redox Concentration (Pore lining)

1. Plant root grows into soil

5. Reduced Fe moves away from decomposing root

Reduced Fe oxidizes, soil turnsred

2. Root dies and starts to decompose

3. Water table rises

4. Bacteria continue to decompose root

Oxygen reduced

Nitrate reduced

Fe reduced and removed, soil turnsgray

6. Water drains from root channel

7. Root completely decomposed

8. Water table drops

Redox depletion

slide17

Redox depletion

Lithochromic mottle

wetland definition as defined by fsa manual and coe 1987 manual
Wetland Definition (as defined by FSA Manual and COE 1987 Manual)
  • has wetland hydrology
  • has a predominance of hydrophytic vegetation
  • the presence of hydric soil
wetland hydrology occurs when
Wetland hydrology occurs when:
  • the water table is at or near the surface (12 inches) and,
  • present for at least 5 percent (consecutive) of the growing season.
determining wetland hydrology
Determining Wetland Hydrology

Month

1

2

3

4

5

6

7

8

9

10

11

12

0

6

12

18

Depth (in.)

24

30

36

42

48

determining the growing season
Determining the Growing Season
  • Use NRCS County Soil Survey for beginning and end dates
  • Determine number of days in season
  • Multiply by 0.05
  • Usually between 12 and 14 days in this region
definition of hydric soil

Definition of Hydric Soil

A hydric soil is a soil that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part

field indicators of hydric soils

Field Indicators of Hydric Soils

Field indicators of hydric soils are designed for on-site identification of hydric soils

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