CONTENTS

Abstract
Introduction
     Scope and Objectives
     Approach
Methods
     Data Compilation
     Data Synthesis
          Requirements for Pedon Data
          Data Linkage Models
     Comparability of MUIR and SIR Data with Pedon Data
     Calculations
          SOC Storage (Mass Per Unit Area)
          SOC Inventory (Mass Per Total Area)
          Estimation of Missing Layer/Horizon Data
          Bulk Density
          Empirical Soil Texture Class
          Soil Horizon Groupings
          Interpolation of Missing Data
Results and Discussion
     SOC Storage and Inventory for the MRB
     Geographic Patterns in SOC Storage
     STATSGO/SSURGO Regional Comparisons
          Minnesota
          North Carolina
     Factors Affecting SOC Estimation
     Suitability of Soil-Carbon Data for SOC Assessment
          Map Scale
          Geographic and Temporal Coverage
          Soil Taxonomy
Conclusions
References Cited

FIGURES

1. Map showing U.S. Geological Survey hydrologic regions of the Mississippi River Basin
2–6. Site-specific soil pedon data sets for:
     2. Dillsboro soil, Yancey County, North Carolina
     3. Unnamed soil in Carbon County, Montana
     4. Cathedral or Cathedral-like soil, Fremont County, Colorado
     5. Memphis soil, Crittenden County, southwestern Kentucky
     6. Gepp soil, Randolph County, Arkansas
7. Schematic showing a representative pedon profile for a soil series
8. Maps showing component area-weighted mean coarse-fragment volume for STATSGO and SSURGO map units, Mitchell and Yancey Counties, North Carolina
9. Schematic showing the relation between STATSGO map units and STATSGO map-unit components for Mitchell and Yancey Counties, North Carolina
10. Percentage of rock outcrop in STATSGO and SSURGO map units, Mitchell and Yancey Counties, North Carolina
11. Relations among soil bulk density, organic carbon, and clay for selected A and E horizons of soils in the Mississippi River Basin
12–17. Soil organic carbon storage estimates for mineral soils in:
     12. Mississippi River Basin, site-specific data linked to STATSGO map unit
     13. Nicollet, Renville, and Sibley Counties, Minnesota, site-specific data linked to STATSGO map units
     14. Nicollet, Renville, and Sibley Counties, Minnesota, site-specific data linked to SSURGO map units
     15. Mitchell and Yancey Counties, North Carolina, site-specific data linked to STATSGO map unit
     16. Mitchell and Yancey Counties, North Carolina, site-specific data linked to SSURGO map unit
     17. Mitchell and Yancey Counties, North Carolina, site-specific data linked to SSURGO map units, calculated by two methods
18. Component area-weighted mean depth to bedrock for STATSGO and SSURGO map units, Mitchell and Yancey Counties, North Carolina
19. Geographic extent of soil orders based on SSURGO taxonomy—Nicollet, Renville, and Sibley Counties, Minnesota, and Mitchell and Yancey Counties, North Carolina

TABLES

1. Median bulk densities of mineral soils at:
     A. 1/3-bar tension moisture content for the standard U.S. Department of Agriculture soil texture classes by soil horizon
     B. Oven-dry moisture content for the standard U.S. Department of Agriculture soil texture classes by soil horizon
2. U.S. Department of Agriculture STATSGO map units with and without site-specific, series-level soil organic carbon data for the U.S. Geological Survey hydrologic regions in           the Mississippi River Basin
3–4. Soil organic carbon storage and inventory for the surface meter of mineral soil for:
     3. U.S. Geological Survey hydrologic regions and region subbasins in the Mississippi River Basin
     4. Selected county areas of the Mississippi River Basin

U.S. Department of the Interior, U.S. Geological Survey
URL: https://pubsdata.usgs.gov/pubs/pp/2004/1686a/contents.html
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