Invited article The use and misuse of magnetic methods to monitor environmental pollution in urban areas Uso y abuso de métodos magnéticos en el monitoreo de contaminación ambiental en áreas urbanas

Soils of the municipality of Hocabá, Yucatán, México, were identified according to both Mayan farmers’ knowledge and the World Reference Base for Soil Resources (WRB). To identify Maya soil classes, field descriptions made by farmers and semistructured interviews were utilized. WRB soils were identified by describing soil profiles and analyzing samples in the laboratory. Mayan farmers identified soils based on topographic position and surface properties such as colour and amount of rock fragments and outcrops. Farmers distinguished two main groups of soils: K'ankab or soils of plains and Boxlu’um or soils of mounds. K'ankab is a group of red soils with two variants (K'ankab and Haylu’um), whereas Boxlu’um is a group of dark soils with five variants (Tsek'el, Ch'ich'lu’um, Chaltun, Puslu’um, and Ch'och'ol). Soils on the plains were identified as Leptosoils, Cambisols, and Luvisols. Soils identified in mounds were Leptosols and Calcisols. Many soils identified by farmers could be more than one WRB unit of soil and vice versa; in these cases no direct relationship between both classification systems was possible. Mayan and WRB soil types are complementary; they should be used together to improve regional soil classifications, help transference of agricultural technologies, and make soil management decisions.

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La redacción de la Chronica latina Regum Castellae se articula en función de una serie de decisiones estructurales y narrativas que ponen de manifiesto una agenda política concreta y permiten comprender su proyecto y sus significados. El estudio de la formalización del pasado en esta obra resulta, entonces, básico para su ubicación precisa en el contexto de la producción y circulación de narrativas historiográficas en el reinado de Fernando III y en el contexto también de las tensiones ideológicas que en ellas se dan cita.
La rédaction de la Chronica latina Regum Castellae s’articule autour d’une série de choix structurels et narratifs qui mettent l’accent sur un agenda politique concret et qui permettent de comprendre son projet et son sens. L’étude de la mise en forme du passé dans cette oeuvre est donc essentiel pour la situer précisément dans le contexte de la production et de la circulation des narrations historiographiques sous le règne de Ferdinand III, ainsi que dans le contexte des tensions ideologiques qui s’y sont citées

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