Dataset Listing

Calhoun CZO - Soil Texture (2015-2016)

Variables:  Sample ID, Depth (cm), % clay, % silt, % sand

Standard Variables:  Clay|Sand|Silt|Depth, soil|Recorder code

Date Range:  (2015-2016)

Dataset Creators/Authors:  Heine, Paul R

Contact:  Paul Heine, Duke University, Nicholas School of the Environment, A205 LSRC, Durham, NC 27708.

Field Area:   Calhoun CZO Research Area 1 | Calhoun CZO Research Area 4 | Calhoun CZO Research Area 7

Keywords & XML
  • Description

    These are soil texture data (% sand/silt/clay) for samples collected May-July 2015 and December 2016 in References Areas 1, 4, and 7 during the installation of gas wells. Samples were obtained by coring to depths of 500 cm with a bucket auger. From 50-500 cm, sampling occurred at fixed intervals: 50-100, 100-150, 150-200, 200-250, 250-300, 300-350, 350-400, 400-450, and 450-500 cm. In the upper 50 cm, samples were taken at the following depths: 0-7.5 cm, 7.5-15 cm, 15-30 cm, and 30-50 cm. Extracted soil was mixed on a tarp and sub-sampled in the field. Individual samples were uniquely identified by Reference Area, Gas Well Number, and Depth. Samples were transported to Duke in plastic bags where they were opened and allowed to air-dry for a minimum of 2 weeks. After air-drying, samples were passed multiple times through a #10 sieve (2-mm mesh) to separate soil from > 2-mm fraction. Obtaining pre-sieve bulk soil mass, and post-sieve >2-mm mass, allowed >2-mm mass fraction to be estimated. The < 2-mm fraction was transferred to paper bags for oven-drying at 40C for 48-72 hours. Texture was measured on the oven-dry sample using a standard method based on gravitational sedimentation. The lab SOP is available upon request.
  • Keywords

    Soil texture, Calhoun, gas wells, texture, sand, silt, clay, pipette method

    XML Metadata

    XML is in ISO-19115 geographic metadata format, compatible with ESRI Geoportal Server.

  • Citation for This Webpage

    Heine, Paul R (2016). "CZO Dataset: Calhoun CZO - Soil Texture (2015-2016)." Retrieved 07 Dec 2019, from


Calhoun CZO - Gas Wells Soil Texture Analysis

(xlsx)   Data Level 1

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