Micromorphology of a Soil Catena in Yucatán: Pedogenesis and Geomorphological Processes in a Tropical Karst Landscape

Pedosediments of karstic sinkholes in the eolianites of NE Yucatán: A record of Late Quaternary soil development, geomorphic processes and landscape stability

“…We detected vermiculite as a dominant clay mineral also in shallow Rendzinas of Yucatán, in a previous study of a soil transect at El Edén (Sedov et al, 2008). Although several researchers studied clay mineralogy of soils in this region, vermiculite was never reported among the major clay components.…”

“…This makes us suppose that the erosion of pre-existing soils and short-distance transport and deposition of pedosediments in the karstic depressions (earlier demonstrated in NE Yucatán by Sedov et al, 2007Sedov et al, , 2008 is responsible for the development of the studied fills. Presence of pyrogenic components -charcoal and burned limestone -throughout the pocket profiles strongly supports this hypothesis: these products of forest fires, once near-surface were redeposited towards depressions and incorporated into the pedosediments at different depths.…”

“…In particular, the karstic landscapes of Yucatán demonstrate a high pedodiversity including thin Rendzinas as well as thick red soils (Aguilera, 1959;Quiñones, 1975;Isphording, 1978;Duch, 1988;Schinle, 1991;Bautista et al, 2004Bautista et al, , 2005Sedov et al, 2008). Sedov et al (2008) earlier studied a Rendzina-Calcisol toposequence in the North-East of Yucatán and concluded that the spatial soil variability and distribution there are controlled by interaction of pedogenesis and short-distance redeposition of soil material towards karstic depressions.…”

“…Sedov et al (2008) earlier studied a Rendzina-Calcisol toposequence in the North-East of Yucatán and concluded that the spatial soil variability and distribution there are controlled by interaction of pedogenesis and short-distance redeposition of soil material towards karstic depressions. However the basic questions about the origin of the parent material, grade of its pedogenic transformation, relation to geomorphic processes and their link with natural and human-induced ecosystem changes got only hypothetical answers or were left open (Aguilera, 1961;Quiñones, 1975).…”

Gênese e classificação dos solos de uma topossequência em área de carste na Serra da Bodoquena , MS

“…A forma da superfície e a posição na paisagem influenciam a pedogênese também em carstes de litologia carbonática em regiões de clima árido ou semiárido, conforme observado por Ruellan (2006) e Sedov et al (2008). Esses pesquisadores verificaram a relação entre a geoquímica, a profundidade e a espessura das acumulações de CaCO 3 e a posição dos solos nas encostas, concentrando-se a ocorrência de horizontes cálcicos e petrocálcicos nas áreas de contorno côncavo localizadas no sopé das vertentes, onde a infiltração da água favorece também maior espessura e profundidade de acumulação dos carbonatos.…”