Rapid Carbon Assessment of the U.S.: Project Overview and Summary
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This presentation was presented during the 3 Parallel session on Theme 1, Monitoring, mapping, measuring, reporting and verification (MRV) of SOC, of the Global Symposium on Soil Organic Carbon that took place in Rome 21-23 March 2017. The presentation was made by Ms. Skye Wills, from USDA - USA, in FAO Hq, Rome
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Rapid Carbon Assessment of the U.S.: Project Overview and Summary
- 1. Rapid Carbon Assessment of US Rapid Carbon Assessment of the U.S. : Project Overview and Summary Skye Wills Terry Loecke, Stephen Roecker, Zamir Libohova, and Soil Survey Staff March 21 – 23, 2017 Presentation for the Global Soil Partnership, Global Symposium on Soil Organic Carbon
- 2. Rapid Carbon Assessment of US Objective: Base-line inventory of soil carbon stocks for conterminous U.S. Evaluate impact of ecosystems, land use and cover
- 3. Rapid Carbon Assessment of US Multi-stage Stratified Random Sampling ► Not enough resources to sample all soil series ► Target sampling ► Stratified Random Sampling – 17 regions • (conterminous U.S.) ► Within region Stratification ► 8 – 20 groups of soil series* ► 6 LULC ► 5 types of Land use / cover (LULC): Cropland, Pastureland, Rangeland, Forest land, Wetland *Wills et al., 2013
- 4. Rapid Carbon Assessment of US RaCA Data Collected Information collected on – 6,147 sites – 32, 053 pedons – 144,833 samples
- 5. Rapid Carbon Assessment of US RaCA Data Collected Site Information: landscape, vegetation, management Pedon Description and sample collection – 5 pedons described – Samples collected by horizon to 1m – Bulk density samples collected to 50cm Lab Analysis – All pedons • Bulk Density* • Visible – Near Infrared Spectra – Central pedon (1 per site) • Combustion – total carbon • Calcimeter – inorganic carbon *Sequiera et al., 2014
- 6. Rapid Carbon Assessment of US % SOC by Depth Bulk Density (g cm-3)
- 7. Rapid Carbon Assessment of US Summaries
- 8. Rapid Carbon Assessment of US Land Use – Land Cover SOC stocks stacked by depth increment
- 9. Rapid Carbon Assessment of US Area Weighted - Land Use – Land Cover SOC stocks stacked by depth increment
- 10. Rapid Carbon Assessment of US
- 11. Rapid Carbon Assessment of US
- 12. Rapid Carbon Assessment of US Preliminary Stocks (1 m)
- 13. Rapid Carbon Assessment of US Conclusions • RaCA collected 6,000 pedons across the conterminous United States • SOC stocks are skewed with a few very high values • Most SOC occurs within 5 – 30cm • Wetlands have the highest typical SOC stocks and Rangelands have the lowest • A satisfactory map was made across the conterminous US
- 14. Rapid Carbon Assessment of US Questions?
- 15. Rapid Carbon Assessment of US References – Wills, S., Seybold, C., Chiaretti, J., Sequeira, C., & West, L. (2013). Quantifying tacit knowledge about soil organic carbon stocks using soil taxa and official soil series descriptions. Soil Science Society of America Journal, 77(5), 1711-1723. – Sequeira, C. H., Wills, S. A., Seybold, C. A., & West, L. T. (2014). Predicting soil bulk density for incomplete databases. Geoderma, 213, 64-73. – Soil Survey Staff and T. Loecke. 2016. Rapid Carbon Assessment: Methodology, Sampling, and Summary. S. Wills (ed.). U.S. Department of Agriculture, Natural Resources Conservation Service. – Kern, J. S. (1994). Spatial patterns of soil organic carbon in the contiguous United States. Soil Science Society of America Journal, 58(2), 439-455. – Guo, Y., Amundson, R., Gong, P., & Yu, Q. (2006). Quantity and spatial variability of soil carbon in the conterminous United States. Soil Science Society of America Journal, 70(2), 590-600.
- 16. Rapid Carbon Assessment of US Data Availability Search engine: RaCA soil All methodology and data (including R scripts used to make these figures) https://go.usa.gov/xXCjD – Full url: https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/?cid=nrcs142p2_054164 #methodology R package: soilDB – fetchraca() https://go.usa.gov/xXCjD
- 17. Rapid Carbon Assessment of US Example slides to follow…………
- 18. Rapid Carbon Assessment of US
- 19. Rapid Carbon Assessment of US
- 20. Rapid Carbon Assessment of US
Editor's Notes
- Each region has its own groups Soils that occur in multiple regions (most of them) were grouped separately for each region The group numbers are meaningless outside of a region The groups were chosen to get a range of soil carbon stock values The data is not appropriate for producing fine-scale spatially explicit information about soil carbon stocks (no detailed, mu-level maps) The data only make sense when aggregated
- Sampling domain is all of US with SSURGO map in 2010 does not include water and developed (urban) lands Uses National Resource Inventory as a framework 2 stage design ensures both spatial coverage and randomness Covers all of US– no information for federal lands
- Regional averages follow expected trends: based on known pedogenic relationships between climate and SOC
- Using map of soil groups and land use/cover classes produces a relatively detailed map. Some local geographic features are visible such as: Low areas in the sand hills, and high values in norther Minnesota ‘boundary waters’
- This plot contrasts the CONUS SOC pool estimates and ranges from Guo et al., 2006 (old) and RaCA (new). The old/old line (old/old) is Guo median estimate (cross) and min/max range using STATSGO data and the midpoint approach (old stat approach). The new/old line (orange) is RaCA data estimated using the midpoint approach (old). The new/new line (blue) is RaCA data estimated using the RaCA sampling design. The main point here is that RaCA advananced our understanding of the CONUS SOC pool by both providing greater sampling density and a much better sampling design – which allowed for a hierarchical statistical analysis instead of the midpoint approach.