A digital soil map of Quintana Roo was compiled at a 50 m pixel resolution using a geomorphopedological approach to produce a map that reflects a synoptic view of the geomorphology, environmental conditions and associated soils. Initially, it was developed using a geopedological approach and then converted to a digital map. The map was derived from soil-forming factors using mathematical methods to infer information in places where data were not available. Its compilation included three stages; the first two follow the geopedological approach that consists of a synthesis of data from the characterization of the geomorphological landscapes (vertical dissection, karst geomorphometrics, failures, geology) and soils, and the third stage incorporating environmental components (climate and vegetation) and related variables through various methods of statistical analysis (cluster, principal components and classification analysis) to obtain the pattern of soil distribution and to develop a model for the digital soil map of the study area.ARTICLE HISTORY

The Mexican Caribbean and its main cities have the highest population growth rate in Mexico. This work goal was to analyze the growth of the city of Chetumal and the geopedological characteristics in which it has been developed, to identify potential hazards and thereby improve development programs. The methodology consisted in the study of geopedological characteristics and the analysis of land use changes in the city over time. The main problems of Chetumal are floods and subsidence. Floods are more common in areas where Gleysols soils are found in low-lying areas. The subsidence is associated to Leptosols with a phreatic mantle at a shallow depth where the precipitations favors dissolution of rock. The extrapolation of the relationships between geopedological conditions and the area occupied by the city, allows us to suppose that areas which the current Urban Development Program proposes for future city expansion will develop the same problems of subsidence and flooding as the areas already built in sites with similar conditions. Keywords: Floods, karst, risk, soils, subsidence ResumenEl Caribe mexicano y sus principales ciudades tiene la tasa de crecimiento poblacional más alta de México. El objetivo fue analizar el crecimiento de la ciudad de Chetumal y las características geopedológicas en las que se ha desarrollado, para identificar los peligros potenciales y mejorar con ello los programas de desarrollo. La metodología consistió en el estudio de las características geopedológicas y el análisis de los cambios de uso de suelo de la ciudad en el tiempo. El problema principal de Chetumal son las inundaciones y los hundimientos. Las inundaciones son más comunes en las zonas donde se encuentran suelos Gleysols en zonas bajas. Los hundimientos se asocian a Leptosols con un manto freático a poca profundidad donde las

Existe una gran controversia dentro de las prácticas de cultivo tradicionales que realizan una o dos quemas. La mayor parte de las investigaciones sobre el efecto que tiene la quema en los cultivos van dirigidas hacia tres aspectos: el efecto sobre los microorganismos del suelo, la pérdida de la materia orgánica y la contaminación del aire y efectos en la salud. El proceso de combustión durante la quema de vegetación contribuye a reducir la materia orgánica depositada sobre el suelo, fuente importante de nutrientes como el nitrógeno, fósforo, potasio y magnesio entre otros. Nutrientes que son incorporados en los suelos agrícolas principalmente a través del uso de fertilizantes. Se analizan los cambios físicos y químicos que produce la quema en el suelo sometido a cultivo intensivo de caña en la zona kárstica del sur de Quintana Roo, México. La dinámica de estos suelos kársticos es un poco diferente a otros ya que los altos contenidos de carbonato de calcio interfieren tanto en las propiedades físicas y químicas del suelo como en la disponibilidad de nutrientes para las plantas. Al analizar las propiedades físicas y químicas en los primeros 20 cm de profundidad en un suelo Gleysol antes y después de la quema controlada se encontraron cambios en la textura y diferencias significativas en las concentraciones de fósforo, pH y sodio. El contenido de carbono orgánico varió poco.

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Near faults or unstable areas where an earthquake could happen with capacity to damage buildings or infrastructure, there is often a previous energy that wanders around surroundings, this energy regularly is associated with electromagnetic emissions that generate an electric potential frequently studied as very, ultra-low and extreme frequency emissions (VLF-ULF-ELF_ EM) by remote sensing; under the assumption that this natural potential exists, in aquatic environment within the micro-seismic active area in the coastal border of Guerrero and Oaxaca estates, Mexico, an intensive conductivity monitoring in two artesian well was carried out. The results of intensive conductivity (µS/cm) monitoring done since March to July of 2015, using a low-cost Data logger sensor are presented. The results obtained of the study of 235 seismic events show that 61.64% of them manifest prior conductivity oscillation versus 38.36% of early conductivity oscillation, the possible origin of such oscillation and the likely relation with underground water recharge flux, ground light compression, ground tilt, local electromagnetic energy emissions, human interaction, was debated. The data analysis for long periods of conductivity monitoring and seismic events show that when the number of seismic events becomes intense, conductivity decreases and vice versa, resulting large fluctuations that grow over time like waves; within the study area a possible previous fluctuated long-term energy associated with earthquakes produced around could be arising.