<?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>S0187-57792016000300339</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Distribución a profundidad del carbono orgánico en los suelos de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Depth distribution of soil organic carbon in Mexico soils]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etchevers]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Laboratorio de Fertilidad de Suelos y Química Ambiental ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>34</volume>
<numero>3</numero>
<fpage>339</fpage>
<lpage>355</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792016000300339&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792016000300339&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792016000300339&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La caracterización de la distribución vertical del carbono orgánico en los suelos (COS) en México es una tarea importante, dada la evidencia acumulada que muestra que el COS puede ser desestabilizado por diferentes mecanismos al incrementar la profundidad a la que se encuentra en el perfil. Con el objetivo de modelar la variación del COS con la profundidad, se analizó una base de datos de COS de perfiles de suelos distribuidos en todo México (base de datos INEGI-COLPOS). Esta base se depuró usando diferentes restricciones congruentes con el objetivo de desarrollar modelos matemáticos de la distribución del carbono con la profundidad (z). Los resultados de los ajustes estadísticos mostraron que modelo logarítmico, COS(z)=a-b ln(z), resultó adecuado para lo planteado, por lo que se procedió a su síntesis. Se usó la propiedad de que un conjunto de rectas que se intersectan en un punto común, sus parámetros generan una línea recta. Con base en ella se desarrolló un esquema para estimar el carbono orgánico inerte (COI) del espacio b-a del modelo logarítmico. Adicionalmente, para realizar estimaciones del COS a profundidad (hasta su valor máximo) usando sólo el valor del COS de 0 a 30 cm, se desarrolló un método para realizar estas estimaciones a partir de parámetros asociados a los ecosistemas y tipos de vegetación. Los resultados de los ejercicios realizados para estimar el COI y el carbono orgánico a profundidad en los suelo usando sólo el COS 30 cm muestran ser adecuados y pueden ser implementados en forma operativa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The characterization of the vertical distribution of soil organic carbon (SOC) in Mexican soils is an important assignment, given the accumulated evidence that the SOC can be destabilized by different mechanisms as depth in the prof ile increases. In order to model the SOC variation with depth, a database of SOC from prof iles distributed throughout Mexico was analyzed (INEGI-COLPOS database). This database was f iltered using different restrictions consistent with the objective of developing mathematical models of carbon distribution with depth (z). The statistical adjusted results showed the logarithmic model, SOC (z) = a-b ln (z), being suitable for the planned purpose, so we proceeded to its synthesis. We used the property that a set of lines that intersect at a common point when their parameters are plotted generates a straight line. Based on this scheme it was developed an estimation of the inert organic carbon (IOC) considering the a-b space of the logarithmic model. In addition, to estimate the SOC at different soil depth using the values of SOC from 0 to 30 cm, a method was developed from parameters associated to ecosystems and vegetation types. The results of the exercises carried out to estimate the IOC and organic carbon in the soil depth using only the COS measured in the 0 to 30 cm depth prove to be appropriate and can be implemented operationally.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[modelo logarítmico]]></kwd>
<kwd lng="es"><![CDATA[COI]]></kwd>
<kwd lng="es"><![CDATA[COS 30 cm]]></kwd>
<kwd lng="es"><![CDATA[ecosistemas y tipos de vegetación]]></kwd>
<kwd lng="es"><![CDATA[modelo COLPOS]]></kwd>
<kwd lng="en"><![CDATA[logarithmic model]]></kwd>
<kwd lng="en"><![CDATA[IOC]]></kwd>
<kwd lng="en"><![CDATA[SOC 30 cm]]></kwd>
<kwd lng="en"><![CDATA[ecosystems and vegetation types]]></kwd>
<kwd lng="en"><![CDATA[COLPOS model]]></kwd>
</kwd-group>
</article-meta>
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