<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792018000400323</article-id>
<article-id pub-id-type="doi">10.28940/terra.v36i4.329</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Identificación de covariables ambientales que influyen en la formación de cárcavas en la Mixteca Oaxaqueña]]></article-title>
<article-title xml:lang="en"><![CDATA[Identification of environmental covariates that influence the formation of gullies in the Mixteca of Oaxaca]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toledo Medrano]]></surname>
<given-names><![CDATA[María Lorenza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Reynoso]]></surname>
<given-names><![CDATA[Demetrio S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Menez]]></surname>
<given-names><![CDATA[Mario R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio Granados]]></surname>
<given-names><![CDATA[Erasmo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Rodríguez]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Edo. de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Edo. de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Politécnica de Madrid Unidad de Hidráulica e Hidrología ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>36</volume>
<numero>4</numero>
<fpage>323</fpage>
<lpage>335</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792018000400323&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792018000400323&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792018000400323&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La Mixteca Oaxaqueña es una región afectada por cárcavas, siendo los detonantes la interacción de variables geológicas, topográficas y antropogénicas; estas últimas por uso irracional de los recursos naturales, con mayor relevancia desde la conquista a la actualidad. La presente investigación busca identificar las covariables ambientales que favorecen la formación de cárcavas en la Mixteca Oaxaqueña, a través de cartografía en escalas inferiores a 1:50 000 y análisis multivariado de los principales factores que, según la literatura, influyen en este tipo de erosión. Las covariables preseleccionadas fueron sometidas a un análisis estadístico para discriminar aquellas con altas correlaciones entre sí, de este proceso resultaron seleccionadas: distancia a fallas y picos, pendiente del terreno, curvatura vertical, curvatura horizontal, índice de posición topográfica, longitud de la pendiente, índice topográfico de humedad, densidad de población y densidad de vegetación (DV). Sobre estas covariables se realizó una clasificación supervisada, por el método de máxima verosimilitud, sobre seis componentes principales que condensaban, según el análisis de componentes principales (ACP), el 96.7% de la información contenida en estas diez covariables. De la clasificación se obtuvieron las probabilidades de susceptibilidad a la formación de cárcavas y para validar la presencia de cárcavas se verificaron, en Google Earth, aquellos pixeles con probabilidad superior al 50%. La confiabilidad del mapa resultante, en función de ausencia y presencia de cárcavas, fue de 96.2%; para un buffer de 50 m resultó de 83.4%, para uno de 100 m fue 81.7% y para uno de 150 m alcanzó 77.9%. Se concluye que las covariables con mayor influencia en la formación de cárcavas, para el área de estudio y por orden de importancia, son: distancia a fallas y picos, índice topográfico de humedad, densidad de vegetación, pendiente del terreno y densidad de población.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: The Mixteca Oaxaqueña is a region affected by gullies, which trigger the interaction of geological, topographic and anthropogenic covariates. The latter is the result of irrational use of natural resources, which has had greater relevance since the Conquest. The present research seeks to identify the environmental covariates that favor gully formation in the Mixteca region of the Mexican state of Oaxaca, using cartography at scales lower than 1:50 000 and multivariate analysis of the main factors that, according to the literature, influence this type of erosion. The preselected covariates were subjected to statistical analysis to discriminate those that correlated highly with each other. From this process we selected the following for analysis: distance to faults, distance to peaks, terrain slope, vertical curvature, horizontal curvature, topographic position index, slope length, topographic index of moisture, population density and vegetation density. Supervised classification was applied to these covariates by the method of maximum likelihood, on six main components that, according to the principal component analysis (PCA), condensed 96.7% of the information contained in these ten covariables. The probabilities of gully susceptibility were obtained from the classification, and gully presence was verified in Google Earth for those pixels with probability higher than 50%. The reliability of the resulting map, based on absence and presence of gullies, was 96.2%, for a buffer of 50 m reliability was 83.4%, for a radius of 100 m it was 81.7%, and for one of 150 m it reached 77.9%. From this work, it was concluded that covariates with greater influence on gully formation, for the study area and in order of importance are distance to faults, distance to peaks, topographic moisture index, vegetation density, slope of the terrain and population density.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[máxima verosimilitud]]></kwd>
<kwd lng="es"><![CDATA[análisis multivariado]]></kwd>
<kwd lng="es"><![CDATA[puntos de supervisión]]></kwd>
<kwd lng="es"><![CDATA[modelos de elevación]]></kwd>
<kwd lng="en"><![CDATA[maximum likelihood]]></kwd>
<kwd lng="en"><![CDATA[multivariate analysis]]></kwd>
<kwd lng="en"><![CDATA[monitoring points]]></kwd>
<kwd lng="en"><![CDATA[elevation models]]></kwd>
</kwd-group>
</article-meta>
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