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Chasing a Spodic Horizon along the St. Johns River, Florida. Jason O’Donoughue SOS 5716C 12 April, 2010. Lake George. http://sjr.state.fl.us/springs/marion/images/silver_glen_aerial.jpg. Putnam. Marion. Volusia. Lake. http://sjr.state.fl.us/springs/marion/images/juniper_pool.jpg.

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Chasing a spodic horizon along the st johns river florida

Chasing a Spodic Horizon along the St. Johns River, Florida

Jason O’Donoughue

SOS 5716C

12 April, 2010


Lake George

http://sjr.state.fl.us/springs/marion/images/silver_glen_aerial.jpg

Putnam

Marion

Volusia

Lake

http://sjr.state.fl.us/springs/marion/images/juniper_pool.jpg


Immokalee sand: deep, poorly to very poorly drained spodosols, with a Bh horizon at ~90 cmbs

Pomello sand: very deep, moderately well to somewhat poorly drained spodosols, with a Bh horizon at ~105 cmbs

St. Lucie sand: very deep, excessively drained, very rapidly permeable entisols on dune-like ridges; A – C pedon


“Problems arising from fixed-depth assessment of deeply weathered sandy soils”*

Immokalee

Pomello

St. Lucie

A

A

A

C

E

E

Bh

Bh

*W.G. Harris, S.H. Crownover, J. Hinchee, 2005, Geoderma 126:161-165


St. Lucie Sand weathered sandy soils”*

Ap

Ap: 0-16 cm, 10YR 6/1 sand, loose, clear boundary

E1: 16-78 cm, 10YR 8/2, sand, loose, clear boundary

E2: 78-128 cm, 10YR 8/1, sand, very friable, abrupt boundary

Bh1: 128-134 cm, 7.5YR 2.5/2, sand, friable, clear boundary

Bh2: 134-142 cm, 7.5YR 4/4, sand, very friable, gradual boundary

E1’: 142-170 cm, 10YR 4/4, sand, very friable, diffuse boundary

E2’: 170-210 cm, 10YR 4/3, sand, very friable, gradual boundary

E3: 210-270+ cm, 10YR 3/6, sand, very friable, saturated

E1

E2

Bh1

Bh2

E1’

E2’

E3


Ap weathered sandy soils”*

E2’

E2

Bh1

E1

Bh2

E3

E1’


St. Lucie Sand weathered sandy soils”*

Ap

Infiltration Rate: High

Hydraulic Conductivity: High

Available Water: Very low

SHWT = 100 to 150 cm

Limitations

Dwellings with basement – Slight

Septic tank absorption field – Moderate

Local roads and streets – Slight

Site Characteristics

Upland position

Marine parent material

Nearly level slope (0-2%)

Very slow surface runoff

Very low erosion potential

Classification:

Ochric Epipedon

Albic Horizon

Spodic Horizon

Spodosol!

E1

E2

Bh1

Bh2

E1’

E2’

E3


Immokalee Sand weathered sandy soils”*

Oi

Oi: 0-10 cm, 5YR 5/2, sand, loose, abrupt boundary

Ap1: 10-18 cm, 10YR 4/1, sand, very friable, clear boundary

Ap2: 18-26 cm, 10YR 5/1, sand, very friable, clear boundary

E1: 26-50 cm, 10YR 6/2, sand, very friable, clear boundary. Few redox depletions.

E2: 50-86 cm, 10YR 5/2, sand, very friable, clear boundary, saturated

E3: 86-130+ cm, 10YR 5/3, sand, very friable, saturated

Ap1

Ap2

E1

E2

E3


Immokalee Sand weathered sandy soils”*

Oi

Infiltration Rate: High

Hydraulic Conductivity: High

Available Water: Very low

SHWT = 25 to <50 cm

Limitations

Dwellings with basement – Severe

Septic tank absorption field – Severe

Local roads and streets – Moderate

Site Characteristics

Upland position

Marine parent material

Nearly level slope (0-2%)

Very slow surface runoff

Very low erosion potential

Classification:

Ochric Epipedon

Albic Horizon

Entisol!

Ap1

Ap2

E1

E2

E3


Concluding thoughts… weathered sandy soils”*

  • Soil mapped as St. Lucie sand (Entisol) contained a Bh at ~134 cmbs and was classified as a Spodosol

  • Spodic horizon not encountered in soil mapped as Immokalee sand (Spodosol), but only investigated to 130 cmbs

  • Illustrates 2 points:

    • scale of soil maps – boundaries do not always map precisely on the ground

    • problem with fixed-depth assessment – may be fine for classification, but can’t be used for pedological assessment

  • Genesis of St. Lucie sand – any thoughts?

  • Questions?


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