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Spatial Heterogeneity of the Soil Cover in the Yucatn Karst: Comparison of Mayan, WRB, and Numerical Classifications

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In karstic areas, geopedologic information integrating soil and relief features, especially concerningshort-distance variability, is usually scarce. The aim of this paper was to compare soil classes in theYucatnkarst using the Mayan soil nomenclature, theWorld Reference Base for Soil Resources
(WRB),numerical soil classification (NSC), and geostatistics. The landscape is a flat-to-slightly-undulating karsticplain. Soil properties were determined at 54 sampling points on a regular grid covering an area of 1350 m2.
Six indigenous soil classes were identified on the basis of the terrain position, topsoil color, stoniness, rockiness,rock type, and soil depth. Five WRB soil units were recognized belonging mainly to Leptosols. Furthermore,six NSC groups were determined mainly on the basis of organic matter and stoniness. Soil organicmaterial and texture explained 57% of the variation of the soil cover. An isotropic model of organic carbonshows a range of 39 m.

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