<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222020000100112</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2020v72n1a300919</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cuantificación de los componentes del suelo en secciones delgadas: Mosaicos de alta resolución versus imágenes individuales]]></article-title>
<article-title xml:lang="en"><![CDATA[Quantification of soil components in thin sections: High resolution mosaics versus individual images]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Guerrero]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Castorena]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Castorena]]></surname>
<given-names><![CDATA[Edgar Vladimir]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz Solorio]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[Juan Manuel]]></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 Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Gral. Escobedo N.L.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Agroscope  ]]></institution>
<addr-line><![CDATA[Nyon ]]></addr-line>
<country>Suiza</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>72</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222020000100112&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222020000100112&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222020000100112&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los cambios en la estructura del suelo se pueden monitorear a partir de muestras inalteradas a través del análisis micromorfométrico de secciones delgadas. En esta metodología es común que se empleen imágenes individuales (de tres hasta diez repeticiones) que no se pueden relacionar en diferentes escalas; además, aunque se establezca un área mínima de estudio, se desconoce su representatividad en los componentes del suelo. El objetivo de este estudio fue cuantificar y los componentes del suelo (poros, agregados y raíces) y comparar los valores obtenidos a partir de imágenes individuales versus mosaicos de alta resolución de toda una sección delgada. Muestras inalteradas fueron colectadas en tres suelos con diferentes contenidos de arcilla (Entisols, Inceptisols y Vertisols) y presencia de raíces de maíz en la misma etapa de desarrollo fenológico (madurez fisiológica). De tres secciones delgadas de cada suelo (4.6 × 7.2 cm × 30 &#956;m; 1865 mm2) se obtuvieron imágenes secuenciales de 11.1 × 7.4 mm (63 en total) a un aumento de 2× utilizando un microscopio petrográfico y luz polarizada plana (PPL, por sus siglas en inglés). Los mosaicos de alta resolución espacial (2.6 µm píxel-1) a una profundidad de color de 24 bits (8 bits × 3 bandas en estándar RGB) se construyeron y analizaron utilizando operadores espaciales; posteriormente, se seleccionaron de manera aleatoria tres, cinco y diez imágenes. Tanto las imágenes individuales como los mosaicos fueron transformados mediante componentes principales en ArcGis® y los constituyentes del suelo fueron delimitados de acuerdo con los valores de sus varianzas. Los resultados indican que las imágenes individuales se recomiendan sólo para cuantificar porosidad o bien en sistemas homogéneos en estructura y color, pero no en sistemas heterogéneos donde los datos obtenidos muestran una alta variabilidad. Incluso cuando los resultados son similares a los calculados en los mosaicos, la dispersión de los datos es alta (varianza 5 veces mayor que la media) y con poca representación. En contraste, con los mosaicos de alta resolución se pueden cuantificar todos los componentes del suelo de toda la sección delgada y se pueden agrupar en clases o categorías para observar las relaciones externas o internas en el sistema del suelo. Además, los componentes del suelo se pueden relacionar con diferentes escalas, por ejemplo, macroagregados y raíces.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Changes in soil structure can be monitored in undisturbed soil samples through the micromorphometric analysis of thin sections. In this methodology, it is common that individual images (three to ten repetitions) are used and that they cannot be related in different scales between soil components; in addition, although a minimum study area is established, its representativeness in the soil components is unknown. The objective of this study was to quantify the soil constituent (pores, aggregates, and roots) and to compare the values obtained from individual images versus high-resolution mosaics from a complete thin section. Unaltered samples were collected in three soils with different clay contents (Entisols, Inceptisols, and Vertisols) and presence of maize roots in the same phenological development stage (physiological maturity). Three thin sections of each soil (5 × 7 cm × 30 &#956;m 1865 mm2) were prepared and sequential images of 11.1× 7.4 mm (63 in total) were obtained at 2× magnification using a petrographic microscope and plane polarized light (PPL). The high-resolution mosaics (2.6 µm píxel-1) at a colour depth 24 bits (8 bits × 3 bands in standard RGB) were built using space operators; subsequently, three, five and ten images were randomly selected. The individual images and the mosaics were transformed by principal component analysis in ArcGis® and soil constituents were delimited according to their variances values. The results indicate that individual images are recommended only to quantify porosity or in homogeneous systems in structure and color, but not in heterogeneous systems where the data obtained show high variability. Even when the results are similar to those calculated in the mosaics, the dispersion of the data is high (variance 5 times greater than the mean) and with little representation. In contrast, high-resolution mosaics offer the total quantification of the thin section and soil components can be grouped into classes or categories to observe intra or inter relations in the soil system. In addition, the soil components can be related to different scales, for example macroaggregates and roots.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Análisis de imágenes]]></kwd>
<kwd lng="es"><![CDATA[segmentación]]></kwd>
<kwd lng="es"><![CDATA[edaforrasgos]]></kwd>
<kwd lng="es"><![CDATA[análisis de componentes principales]]></kwd>
<kwd lng="es"><![CDATA[micromorfometría]]></kwd>
<kwd lng="en"><![CDATA[Image analysis]]></kwd>
<kwd lng="en"><![CDATA[segmentation]]></kwd>
<kwd lng="en"><![CDATA[pedofeatures]]></kwd>
<kwd lng="en"><![CDATA[principal component analysis]]></kwd>
<kwd lng="en"><![CDATA[micromorphometry]]></kwd>
</kwd-group>
</article-meta>
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