Soil Information.

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Presentation transcript:

Soil Information

Soil mapping is problematic: Issues of scale Level of generalization

County Soil Surveys Paper copy available from County NRCS office For counties that have been surveyed Free to public PDF file at NRCS website

Other useful links Soil series descriptions MN NRCS site Official Series Descriptions :OSDs MN NRCS site

Digital Soil data Extends useful life of soil reports : Easily updated Tailored to future needs Spatially referenced GIS-compatible format Geographic Information Systems Hardware/software for spatial analysis SSURGO STATSGO

SSURGO Soil Survey Geographic database More detail than STATSGO “SSURGO-certified” National cartographic standards More detail than STATSGO 1:12000 to 1:63,360 Landowners and county-level planning Not directly readable from Internet need GIS or other interface

STATSGO State Soil Geographic database More generalized than SSURGO 1;250,000 For land use planning over large areas Not directly readable from Internet For use with GIS or other interface

Soil mapping is problematic: Issues of scale Level of generalization

Soil Survey Soil surveys describe kinds of soils that exist in an area. Soils are described in terms of their : location on the landscape profile characteristics relationships to one another suitability for various uses needs for particular types of management Soils are grouped into MAP UNITS

Soil map units are the basic unit of a soil Map. Collection of areas defined and named the same in terms of their soil components (e.g., series) (or miscellaneous areas or both) Fallsington sandy loam, 0 to 2% slopes Marr-Dodon complex, 2 to 5% slopes Soil map units are the basic unit of a soil Map. Each soil map unit differs in some respect from all others in a survey area.

Hierarchical categories Order Suborder Great group Subgroup Family Series Alfisol Udalfs Hapludalfs Typic hapludalfs Fine,loamy,mixed,superactive,frigid Nebish Fine-loamy, mixed, superactive, frigid Typic Hapludalfs

Each map unit has a unique symbol (numbers or letters) on the soil map, for example: FaA MnB “Mono-taxa” units are dominated by a single soil type • “Multi-taxa” units include two or more main soil types