1 / 22

Reporting Frameworks for Continental-Scale Soil Studies

Reporting Frameworks for Continental-Scale Soil Studies. Robert G. Garrett Geological Survey of Canada Natural Resources Canada and Robert G. Eilers National Soils Resource Interpretations Agriculture and Agri-Food Canada Soil Geochemistry Workshop, USGS Denver, March 4-6, 2003. Outline.

kent
Download Presentation

Reporting Frameworks for Continental-Scale Soil Studies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reporting Frameworks forContinental-Scale Soil Studies Robert G. Garrett Geological Survey of Canada Natural Resources Canada and Robert G. Eilers National Soils Resource Interpretations Agriculture and Agri-Food Canada Soil Geochemistry Workshop, USGS Denver, March 4-6, 2003

  2. Outline • Spatial Variation, at what scale is information required? • Sampling Frameworks and Strategy • Considerations for Pedon Sampling • Questions and Identification of Topics for Discussion

  3. Spatial Resolution • What do clients/users require? • Has to meet multi-stakeholder requirements • Political or natural units (frameworks)? • NAFTA-CEC has developed a Tri-National ecological classification for North America • This classification reflects the underlying geology, climate, botany, soil microbiology and pedology

  4. The Ecoregion Classification • The Level II Ecoregion classification will be used by Environment Canada in future Ecological Risk Assessments and for framing Risk Management decisions • Level II ecoclassification has been completed for both Canada and the US. It is a commonly accepted spatial framework • This framework respects and reflects the subject-matter interests of a broad population

  5. An Example - Arsenic • Reframing a 2 site per 800 km2 1992 soil geochemical study of the Canadian Prairies • The 1992 objective was to acquire an unbiassed estimate of mean geochemical levels and identify any systematic spatial variation • Total As (mg/kg - ppm) was determined by Instrumental Neutron Activation Analysis (INAA) in the <2 mm fraction of 0-25 cm surface soils

  6. Considerations for Pedon Sampling • Statistical selection of sample sites • Number and location • Site type and definition • Simple or Deluxe site, or • Mutiple purpose, multi-stakeholder, site • Purpose • Characterization • Monitoring Short term or long term

  7. Considerations for pedon sampling.Basic Landform elements Surface and subsurface soil hydrology Recharge Dissipation Zones Transit Zones Accumulation Zones

  8. Considerations for Pedon Sampling • Spatial Variability at a Site • Representivity of landform elements • Extrapolatability • Temporal Variability at a Site • Replicability • Biological (dynamics) • Sampling Coordination • Temporal independence – pedological and geological • Temporal dependence – biological (seasonal sensitivities)

  9. Considerations for pedon sampling.Basic Landform elements(spatial variability of sample site) Pedon site - Pedology/geology Satellite- sample subsites ? - monitoring sites ?

  10. Considerations for Pedon Sampling(Malegus 1997, U of M.) • Grassland Soils (Profile variability)

  11. Considerations for Pedon Sampling(Malegus 1997, U of M.) • Recently cultivated Forest Soil (Profile variability)

  12. Some Outstanding Questions • What Spatial Framework is both practical and meets client/user needs? • The answer defines the target populations • How do we obtain representative samples from the target populations to meet user/client needs? • How do we physically collect soils on a pedon and local/site scale? • How do we report the results and meet user/client expectations?

  13. Acknowledgements • We thank Glenn Lelyk and Susan Davies for their assistance in preparing the maps and graphics used in this presentation, and to Russ Malegus for the use of his thesis data.

More Related