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Título del libro: New Trends In Soil Micromorphology
Título del capítulo: Micromorphology of a soil catena in yucatán: Pedogenesis and geomorphological processes in a tropical karst landscape

Autores UNAM:
SERGUEI SEDOV; ELIZABETH SOLLEIRO REBOLLEDO; TERESA PI PUIG; ERNESTINA VALLEJO GOMEZ; MARIA DE LOURDES FLORES DELGADILLO;
Autores externos:

Idioma:
Inglés
Año de publicación:
2008
Palabras clave:

karst erosion; Maya civilization; micromorphology; Pedogenesis; soil toposequence


Resumen:

Development of the soil mantle in karst geosystems of the tropics is still poorly understood. We studied a typical soil toposequence formed over limestone in the northeastern Yucatán Peninsula of Mexico, to assess the pedogenetic and -geomorphological processes which control soil formation and distribution, as well as to understand their relation to landscape development and their influence in -ancient Maya agriculture. The soil cover is dominated by thin Leptic Phaeozems and Rendzic Leptosols in the uplands, and Leptic Calcisols in the wetlands. Upland soils have weathered groundmass containing abundant vermiculitic clay and iron oxides. The combination of thinness and high weathering status is explained by interaction between the intensive pedogenesis and vertical transport of soil material towards karst sinkholes. In wetlands, biochemical secondary calcite precipitation occurs, accompanied by surface accumulation of algal residues (periphyton crust). In the transitional area, a polygenetic profile (Calcisol over Cambisol) was developed, -indicating recent advance of wetlands. Because of specific pedogenesis, the upland soils lack many disadvantages of other soils of humid tropics, such as -acidity, low humus content, and poor structure. However, ancient land-use practices had to be adjusted to thin soils, low P availability and soil loss due to karst erosion. © 2008 Springer-Verlag Berlin Heidelberg.


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