Ninigret Pond Soil Pedon Description: VBB (Flood-Tidal Delta Slope)

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Pedon Description
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Site Information

Print Date:  

06/15/2004

Description Date:  

09/18/2000

Describer:  

Mike Bradley

 

Site ID:  

VBB

Site Notes:  

Vibracore Description

Pedon ID:  

VBB

Pedon Notes:  

 

Lab Source ID:  

URI

Lab Pedon #:  

 

 

Soil Name as Described/Sampled:  

Flood-Tidal Delta Slope

Soil Name as Correlated:  

 

Classification:  

 

 

 

Pedon Type:  

 

Pedon Purpose:  

research site – Masters Thesis

Taxon Kind:  

 

Associated Soils:  

 

 

Location Information

Country:  

USA

State:  

RI

County:  

Washington

MLRA:  

149B

Soil Survey Area:  

 

Quad Name:  

Quonochataug

 

Location Description:  

Ninigret Pond, Charlestown, RI

Legal Description:  

 

 

Latitude:  

41 degrees 21 minutes 55.66 seconds north

Longitude:  

71 degrees 38 minutes 40.73 seconds west

Datum:  

NAD83

UTM Zone:  

19

UTM Easting:  

278804 meters

UTM Northing:  

4582703 meters

 

Physiographic Division:  

Atlantic Lowland

Physiographic Province:  

Coastal Plain

Physiographic Section:  

Embayed Section

State Physiographic Area:  

 

Local Physiographic Area:  

Ninigret Pond

 

Geomorphic Setting:  

Flood-Tidal Delta Slope

Upslope Shape:  

 

Cross Slope Shape:  

 

 

Primary Earth Cover:  

water cover

Secondary Earth Cover:  

 

Plant Association Name:  

 

Existing Vegetation:  

 

 

Parent Material:  

Silty estuarine sediments

Bedrock Kind:  

 

Bedrock Depth:  

 

Bedrock Hardness:  

 

Bedrock Fracture Interval:  

 

 

Surface Fragments:  

 

 

Particle Size Control Section:  

 

 

Diagnostic Features:  

 

 

 

Pedon Description:

A1--0 to 13 centimeters; black (N 2.5/0), very fine sandy loam; abrupt.

A2--13 to 26 centimeters; very dark gray (5Y 3/1), very fine sandy loam; coarse distinct olive gray (5Y 4/2) mottles; abrupt.

C1--26 to 44 centimeters; very dark gray (5Y 3/1) and dark gray (5Y 4/1), sand; clear.

2Ab--44 to 62 centimeters; black (N 2.5/0), very fine sandy loam; abrupt.

2C1--62 to 69 centimeters; very dark gray (5Y 3/1), sandy loam; abrupt.

3Ab--69 to 86 centimeters; very dark gray (5Y 3/1), fine sandy loam; 1 percent shell fragments; abrupt.

3C1--86 to 93 centimeters; dark gray (5Y 4/1), loamy sand; abrupt.

3C2--93 to 100 centimeters; dark gray (5Y 4/1), loamy sand; abrupt.

4Ab--100 to 108 centimeters; very dark gray (5Y 3/1), sandy loam.

Map Unit Description (Bradley Stolt):

FtdS(A) – Flood-tidal Delta Slope, 1 – 2% slopes:  These soils are found at the edge of the flood-tidal delta along the active and inactive lobes of the delta.  Water depths are moderate (0.8 – 1.1 m). The subaqueous soils are highly stratified and buried ‘A’ horizons are very common.   Surface and buried ‘A’ horizons are 9-30 cm thick and generally very dark olive gray, dark olive gray, and dark gray loams, silt loams, or fine sandy loams.  ‘C’ horizon textures are sandy.  Buried and subsurface horizons can have pH values of 8.5 or greater.  Soils are classified as Typic Fluvaquents and Sodic Psammaquents, with inclusions of Sodic Endoaquents.  Submerged topography is gently sloping toward deeper water.  Eelgrass cover is high (>50%) and buried ‘A’ horizons are old eelgrass beds.

Field Descriptions:

Horizon

Depth (cm)

Boundary

Field

n-value

Munsell

Munsell

Redox features

Field

Shell

 

Notes

 

lower

Dist.

Texture

 

Color

Color

Color/Conc.

Coarse

Frags %

*1

 

boundary

 

Class

 

(matrix)

Name

 

Frags %

 

*2

A1

13

a

vfsl

> 1

N 2.5/

black

 

 

 

 

A2

26

a

vfsl

> 1

5Y 3/1

very dark gray

 

 

 

 

C1

44

c

s

 

5Y (3&4)/1

dark and very dark gray

 

 

 

 

2Ab

62

a

vfsl

> 1

N 2.5/

black

 

 

 

 

2C1

69

a

sl

 

5Y 3/1

very dark gray

 

 

 

 

3Ab

86

a

fsl

 

5Y 3/1

very dark gray

 

 

< 1%

*3

3C1

93

a

ls

 

5Y 4/1

dark gray

 

 

 

*4

3C2

100

a

ls

 

5Y 4/1

dark gray

 

 

 

 

4Ab

108

 

sl

 

5Y 3/1

very dark gray

 

 

 

*5

*1.  Common med coarse eelgrass rhizomes and fragments

*2.  Common distinct coarse mottles 5Y 4/2.  Common med coarse eelgrass frags.

*3.  Plant material.  (Leaves probably old ee surface)

*4.  Fine laminar OM lenses

*5.  Salt marsh surface.  Old Spartina leaves v. common.  Very common medium and fine roots.

Laboratory Analysis:

Horizon

Depth   (cm)

% Coarse Frags

% Shell Frags

% VCO   (1-2 mm)

% CO     (1-0.5 mm)

% M                (0.5-0.25 mm)

% F                 (0.25-0.1 mm)

% VF               (0.1-0.05 mm)

% Total Sand

% Silt

% Clay

USDA Texture Class

A1

13

0

0

8.2

54.8

0

0

0.1

37

54.8

8.2

sil

A2

26

0

0

11

53

0.2

0.3

0.3

36

53

11

sil

C1

44

0

0

1

9

0

0

0.6

90

9

1

vfs

2Ab

62

0.01

0.02

8.3

46.7

0.3

0.3

0

45

46.7

8.3

l

2C

69

0

0

2.3

32.7

1

1

1

65

32.7

2.3

vfsl

3Ab

86

0

0.01

9.3

50

0.1

0.1

0

40.7

50

9.3

l

3C1

93

0

0

1

14.7

0.5

0.8

0.8

84.3

14.7

1

lvfs

3C2

100

0

0

1

18

0.5

0.6

1

81

18

1

lvfs

4Ab

108

0

0

1.5

21.5

0.5

2.5

1.5

77

21.5

1.5

lvfs

Chemical Properties:

Horizon

Depth   (cm)

Total Nitrogen (%)

AVS (ug/g)

CRS (ug/g)

CaCO3 (%)

Organic Carbon (%)

 A1

13

0.146

129

27

0.853

1.616

 A2

26

0.161

NA

NA

0.852

2.020

 C1

44

0.037

0

7.100

0.395

0.390

 2Ab

62

0.111

NA

NA

0.804

1.264

 3Ab

86

0.125

NA

NA

0.850

1.573

Photo of Core VBB