Guanica Forest NEON (GUAN) Soil Descriptions

Pedon Descriptions

Pit‐level observations and field measurements reported using the standard NRCS format. They contain volume estimates for coarse fragments > 20 mm where applicable.

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Site Level Plot Summary

A narrative summary that places the sampled soil pedons in the broader context of soils and geomorphology for the entire NEON site.

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soil profile

D04 GUAN megapit soil profile 0-93 cm

soil profile

D04 GUAN megapit soil profile 13-200 cm

soil profile

D04 GUAN megapit soil profile 0-32 cm

soil profile

D04 GUAN megapit soil profile 25-58 cm

soil profile

D04 GUAN megapit soil profile 51-92 cm

soil profile

D04 GUAN megapit soil profile 84-111

soil profile

D04 GUAN megapit soil profile 104-130 cm

soil profile

D04 GUAN megapit soil profile 124-162 cm

soil profile

D04 GUAN megapit soil profile 156-200 cm

Megapit Pedon Description

Print Date Mar 11 2016
Description Date Apr 9 2015
Describer M. Matos, S. Rios
Site ID S2015PR055001
Pedon ID S2015PR055001
Lab Source ID KSSL
Lab Pedon # 15N0543
Soil Name as Correlated Altamira
Classification Coarse-loamy, carbonatic, isohyperthermic Typic Haplocalcids
Pedon Purpose research site
Taxon Kind series
Associated Soils La Covana, Seboruco
Physiographic Division Caribbean Basin
Physiographic Province Caribbean Islands Province
Physiographic Section Greater Antilles (Puerto Rico)
Local Physiographic Area Carenero Ward, Dry Forest; Guanica, Puerto Rico
Geomorphic Setting on backslope of side slope of hills
on backslope of side slope of hillslope
Upslope Shape linear
Cross Slope Shape concave
Description origin NASIS
Country United States
State Puerto Rico
County Guanica
MLRA 271 -- Semiarid Mountains and Valleys
Soil Survey Area PR787 -- San German Area, Southwestern Puerto Rico
3-MAZ -- Mayaguez, Puerto Rico
Map Unit LcE -- La Covana-Limestone outcrop-Seboruco complex, 12 to 40 percent slopes
Quad Name Punta Verraco, Puerto Rico
Std Latitude 17.9688200
Std Longitude -66.8688800
Latitude 17 degrees 58 minutes 7.80 seconds north
Longitude 66 degrees 52 minutes 8.00 seconds west
Datum WGS84
UTM Zone 19
UTM Easting 725687 meters
UTM Northing 1988033 meters
Primary Earth Cover Tree cover
Secondary Earth Cover Other grass/herbaceous cover
Parent Material residuum weathered from limestone and siltstone
Bedrock Kind limestone and siltstone
Description database KSSL
Diagnostic Features ochric epipedon 0 to 30 cm.
calcic horizon 30 to 105 cm.
Slope (%) 8.0
Elevation (meters) 133.0
Aspect (deg) 220
Drainage Class well
Horizon Details

A--0 to 30 centimeters (0.0 to 11.8 inches); clay loam, dark gray (10YR 4/1) broken face, moist; strong medium granular, and strong coarse granular structure; slightly hard, firm, moderately sticky, moderately plastic; very fine roots throughout and medium roots throughout; strong effervescence, by HCl, 1 normal; slightly alkaline, pH 7.5, Unspecified; clear wavy boundary. Lab sample # 15N02901, 15N02909

Bk1--30 to 55 centimeters (11.8 to 21.7 inches); silty clay, grayish brown (10YR 5/2) broken face, moist; moderate medium subangular blocky, and moderate coarse subangular blocky structure; very hard, extremely firm, moderately sticky, very plastic; very fine roots throughout and medium roots throughout; 5 percent distinct slickensides (pedogenic) on top faces of peds; 15 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 15 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; strong effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; gradual wavy boundary. Lab sample # 15N02902, 15N02910

Bk2--55 to 86 centimeters (21.7 to 33.9 inches); silty clay loam, light yellowish brown (2.5Y 6/4) broken face, moist; moderate fine subangular blocky, and moderate medium subangular blocky structure; moderately hard, firm, slightly sticky, moderately plastic; very fine roots throughout and medium roots throughout and fine roots throughout; 2 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 2 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; violent effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; clear wavy boundary. Lab sample # 15N02903, 15N02911

Bk3--86 to 105 centimeters (33.9 to 41.3 inches); silty clay loam, light yellowish brown (2.5Y 6/4) broken face, moist; weak fine subangular blocky, and weak medium subangular blocky structure; moderately hard, firm, slightly sticky, moderately plastic; very fine roots throughout; 5 percent faint pressure faces on all faces of peds; 1 percent fine prominent 10YR 5/6), moist, masses of oxidized iron throughout and 1 percent medium prominent 10YR 5/6), moist, masses of oxidized iron throughout; 30 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 30 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; violent effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; clear smooth boundary. Lab sample # 15N02904, 15N02912

BCk--105 to 126 centimeters (41.3 to 49.6 inches); silty clay loam, light yellowish brown (2.5Y 6/3) broken face, moist; weak coarse prismatic, and weak fine subangular blocky, and weak medium subangular blocky structure; very hard, extremely firm, slightly sticky, moderately plastic; very fine roots throughout; 5 percent faint pressure faces on all faces of peds; 25 percent fine prominent 10YR 5/6), moist, masses of oxidized iron throughout and 25 percent medium prominent 10YR 5/6), moist, masses of oxidized iron throughout; 2 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 2 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; strong effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; From 105-108 cm presence of preached water table. 80% 2.5Y 6/2; 15% 10YR 8/1 horizontal carbonate masses along of the unconformity; 5% 7.5YR 4/6 iron masses between peds.; clear smooth boundary. Lab sample # 15N02905, 15N02913

C--126 to 161 centimeters (49.6 to 63.4 inches); silty clay loam, pale yellow (2.5Y 7/3) broken face, moist; weak medium subangular blocky, and weak coarse subangular blocky structure; very hard, extremely firm, slightly sticky, moderately plastic; very fine roots in cracks; 5 percent fine prominent 7.5YR 4/6), moist, masses of oxidized iron throughout and 5 percent medium prominent 7.5YR 4/6), moist, masses of oxidized iron throughout and 20 percent medium prominent 2.5Y 6/2), moist, masses of reduced iron throughout and 20 percent coarse prominent 2.5Y 6/2), moist, masses of reduced iron throughout and 25 percent fine prominent 10YR 5/8), moist, masses of oxidized iron throughout and 25 percent medium prominent 10YR 5/8), moist, masses of oxidized iron throughout; 2 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 2 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; strong effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; From 123-131 cm presence of preached water table. 80% 2.5Y 6/2; 10% 10YR 8/1 horizontal carbonate masses along of the unconformity; 10% 7.5YR 4/6 iron masses between peds.; gradual smooth boundary. Lab sample # 15N02906, 15N02914

Cr--161 to 203 centimeters (63.4 to 79.9 inches);, pale yellow (2.5Y 7/4) broken face, moist; massive; 5 percent fine prominent 7.5YR 4/6), moist, masses of oxidized iron throughout and 5 percent medium prominent 7.5YR 4/6), moist, masses of oxidized iron throughout and 20 percent medium prominent 2.5Y 6/2), moist, masses of reduced iron throughout and 20 percent coarse prominent 2.5Y 6/2), moist, masses of reduced iron throughout and 25 percent fine prominent 10YR 5/8), moist, masses of oxidized iron throughout and 25 percent medium prominent 10YR 5/8), moist, masses of oxidized iron throughout; 15 percent fine prominent 10YR 8/1), moist, carbonate masses throughout and 15 percent medium prominent 10YR 8/1), moist, carbonate masses throughout; strong effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, Unspecified; Moderately weathered calcareous siltstone. Lab sample # 15N02907, 15N02915.

Credits: This megapit soil pedon description was generously created by USDA Natural Resource Conservation Service staff, with particular thanks to Larry West, Jon Hempel, and numerous field staff.