Abstract
Soils from the upper Rio Puerco watershed and El Malpais wilderness study area in New Mexico were analyzed for particle‐size distribution and classified into 1 of 12 textural classes before and after calcium carbonate (CaCO3) removal. The samples selected for analysis had a CaCO3 content of ≥ 5% by volume that represented 32% of the total study samples. All of the samples having CaCO3 changed particle‐size distribution, and 60% of those samples changed textural class following the pretreatment for CaCO3 removal. The greatest changes in particle size were from sand‐ to clay‐size fractions. Therefore, we recommend that all wildland soil samples from the semiarid Southwest be pretreated for CaCO3 removal prior to particle‐size analysis and subsequent textural classification.
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