<?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>S0187-57792016000300321</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelación simple y operativa de la distribución del carbono orgánico por fracciones físicas en los suelos]]></article-title>
<article-title xml:lang="en"><![CDATA[Simple and operational modeling of organic carbon in physical fractions in 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[Covaleda]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo]]></surname>
<given-names><![CDATA[Claudia]]></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 contrib-type="author">
<name>
<surname><![CDATA[Matus]]></surname>
<given-names><![CDATA[Francisco]]></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[,Kibeltik Clima y Medio Ambiente A.C.  ]]></institution>
<addr-line><![CDATA[San Cristóbal de las Casas Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo Laboratorio de Fertilidad]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de la Frontera Departamento de Ciencias Químicas y Recursos Naturales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</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>321</fpage>
<lpage>337</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792016000300321&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792016000300321&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792016000300321&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las emisiones de gases efecto invernadero asociadas al carbono orgánico del suelo (COS) son importantes para estudiar cambios en los ecosistemas terrestres. Hay modelos simples que, ofrecen la oportunidad de analizar la dinámica de las alteraciones provocadas por los cambios en el uso de suelo, la vegetación y las prácticas de manejo. En México se dispone de información del COS total y la textura del suelo. En el presente trabajo se analizan diferentes esquemas para parametrizar el modelo COLPOS, el cual se desarrolló para caracterizar la distribución del COS en fracciones físicas del suelo. El modelo considera el COS de diferentes almacenes: materia orgánica particulada (MOP, materia orgánica lábil) y complejos organominerales (MO + arena-limo-arcilla). El carbono orgánico inerte (COI), con tiempos medios de residencia de cientos a miles de años, y el tamaño de partícula asociado, permiten precisar los parámetros del modelo COLPOS y determinar las pérdidas potenciales de carbono orgánico del suelo. La validación de los métodos de parametrización del modelo COLPOS permite su implementación operativa empleando solamente la información disponible en México (COS y textura del suelo). La parametrización se desarrolló con base en los datos de experimentos de distribución del carbono asociadas al fraccionamiento físico de los suelos, después de la aplicación de dispersión ultrasónica para lograr fraccionamientos completos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Greenhouse gases emissions related to soil organic carbon (SOC) are important in the study of changes in the terrestrial ecosystems. Simple operative models offer the opportunity to analyze the dynamics of alterations induced by land use change, vegetation and management practices. There are a reasonable number of studies reporting soil texture and SOC in Mexico that can be used to operate these simple models. The present study shows various alternatives for establishing parameters of the COLPOS model. This model was constructed to characterize the distribution of SOC in the physical fractions of the soil. The COLPOS model considers SOC in different soil pools: particulate organic matter (POM, labile organic matter) and organomineral complexes (organic matter + sand-silt-clay). Inert organic carbon (IOC), with mean residence times from hundreds to thousands of years and associated particle size, allow precise definition of the COLPOS model parameters and determination of potential SOC losses. Definition of these two parameters allows implementing the COLPOS model using only information on SOC and soil texture available in Mexico. The present approach to determine COLPOS model parameters was implemented from data obtained during physical soil fractionation after ultrasonic dispersion to ensure complete fractionation of soil.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[modelo COLPOS]]></kwd>
<kwd lng="es"><![CDATA[complejos organominerales]]></kwd>
<kwd lng="es"><![CDATA[fraccionamiento físico]]></kwd>
<kwd lng="es"><![CDATA[tamaño de partículas]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica particulada]]></kwd>
<kwd lng="en"><![CDATA[COLPOS model]]></kwd>
<kwd lng="en"><![CDATA[orgamineral complexes]]></kwd>
<kwd lng="en"><![CDATA[physical fractionation]]></kwd>
<kwd lng="en"><![CDATA[particle size]]></kwd>
<kwd lng="en"><![CDATA[particulate organic matter]]></kwd>
</kwd-group>
</article-meta>
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