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These materials are part of a collection of classroom-tested modules and courses developed by InTeGrate. The materials engage students in understanding the earth system as it intertwines with key societal issues. The collection is freely available and ready to be adapted by undergraduate educators across a range of courses including: general education or majors courses in Earth-focused disciplines such as geoscience or environmental science, social science, engineering, and other sciences, as well as courses for interdisciplinary programs.
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Initial Publication Date: October 16, 2014

Unit 4

Prework for Unit 4

  1. (3 pts) Read the 'Introduction' Soil Organic Matter and define SOM and describe its role in supporting plant growth. (A full credit answer will provide a definition and at least three important roles/functions of SOM).
  2. Compare the figures below showing the relative amounts of soil organic matter and the major physiographic regions in the United States.

    1. (3 pts) Does the amount of soil organic matter generally relate to physiographic region? (A full credit answer will describe similarities or differences between at least three regions on the maps).
    2. (3 pts) Based on the reading, what are the two controls on the amount of SOM? How might these controls relate to physiographic regions? (A full credit answer will discuss 2 agents that impact the amount of SOM in the soil and relate these agents to physiographic regions).
  3. Soils are mapped at distinct spatial scales. Soil scientists interpolate, or approximate, boundaries between soil units (pedons). The resolution of a soil study is known as the order of the soil survey. The scale of each order is given in hectares (ha). One ha is equivalent an area of 100 m X 100 m (10,000 m2). Soils are classified by identifying soil properties at depth. These are characterized examining physical (e.g. texture, color) and chemical properties (e.g. SOM) to a depth of National soils are mapped by soil scientists and provided through STATSGO and SSURGO (Soil Survey Geographic Database). STATSGO surveys represent a 1:250,000 scale. SSURGO surveys are more detailed with a scale of 1:24,000 or less. Note that STATSGO surveys represents ~2.5 soil sample sites per 10 ha and SSURGO scale represents ~2.5 soil sample sites per ha.
    1. (2 pts) Based on the table what planning activities/management decisions might the STATSGO and SSURGO soil surveys assist with?
      STATSGO:

      SSURGO:
    2. (1 pt) What activities might require even more detailed sampling than available through SSURGO?

References:

  • Figure 1: Hargrove, W.W. and R.J. Luxmore. 1988. Soil organic matter content across the United States,From: A New High-Resolution National Map of Vegetation Ecoregions Produced Empirically Using Multivariate Spatial Clustering, released to the USDA, public domain.
  • Figure 2: The major physiographic divisions of the 48 conterminous United States. Map based on public domain data from the USGS
  • Table 1: Order of soil survey. Soil Survey Staff. 1993. Soil Survey Manual 18, US Govt, Printing Office, Washington, DC.
These materials are part of a collection of classroom-tested modules and courses developed by InTeGrate. The materials engage students in understanding the earth system as it intertwines with key societal issues. The collection is freely available and ready to be adapted by undergraduate educators across a range of courses including: general education or majors courses in Earth-focused disciplines such as geoscience or environmental science, social science, engineering, and other sciences, as well as courses for interdisciplinary programs.
Explore the Collection »