Arid Lands Newsletter (link)No. 52, November/December 2002
Special issue: Selected papers from the IALC Conference:
Assessing Capabilities of Soil and Water Resources in Drylands:
The Role of Information Retrieval and Dissemination Technologies
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Johnson et al.: Figure 1: Schematic of typical carbon concentrations with depth

Schematic of typical carbon concentrations with depth

The biased sample will give an inflated value for carbon in the A horizon because it takes a disproportionate amount of soil from the upper part of the A horizon, whereas the proportional sample is not biased and will properly represent the average value for the horizon.

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