<?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>S0187-57792014000200127</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Distribución del carbono orgánico en los diferentes tamaños de partículas del suelo: modelo simple de cinética lineal]]></article-title>
<article-title xml:lang="en"><![CDATA[Organic carbon distribution on different particle sizes of soil: simple linear kinetic model]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz Pellat]]></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[Sarah]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etchevers B.]]></surname>
<given-names><![CDATA[Jorge D.]]></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>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>32</volume>
<numero>2</numero>
<fpage>127</fpage>
<lpage>142</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792014000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792014000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792014000200127&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La modelación de la dinámica del carbono orgánico en los suelos (COS) permite establecer ganancias y pérdidas asociadas a perturbaciones de la vegetación y prácticas de manejo. En especial, la estimación de cambios en los reservorios de carbono, lábiles y recalcitrantes, sin consideraciones de estados de equilibrio, plantea la necesidad de establecer un modelo de distribución del COS en las fracciones físicas de los suelos (tamaño de partículas) que pueda ser parametrizado con la información disponible en los inventarios nacionales (COS total y textura). En este trabajo se propone un modelo simplificado de la distribución del COS, el cual es producto del balance de masa entre las fracciones de carbono del suelo, el cual se plantea como directamente asociado al tamaño de las partículas y no a su distribución de masa. El modelo fue calibrado usando una base de datos de fraccionamientos físicos en Andosoles, Cambisoles y Acrisoles en sistemas agrícolas y forestales en Atécuaro, Michoacán, México, considerando solo el COS asociado a la parte organomineral y el total (organomineral + particulada). El modelo de la distribución del COS por tamaño de las partículas del suelo fue ajustado a datos experimentales. El mismo parte del conocimiento del COS total y del COS para un tamaño de partícula de referencia, estimada experimentalmente o supuesta. Los resultados mostraron que para el caso de los sistemas agrícolas el modelo se ajustó bien a las mediciones (R2 &gt; 0.999). Para el caso de los sistemas forestales, las estimaciones son buenas (R2 &gt; 0.97). Al final se discuten las implicaciones del modelo desarrollado, donde el concepto clásico de saturación de COS de los suelos es cuestionado y explicado en términos de las tasas de descomposición y asimilación de la fracción particulada y organomineral; asimismo, la relación entre la textura del suelo y el COS asociado al tamaño de las partículas no es soportada, al considerar a la textura (masa de las fracciones del suelo) como intrínseca a la relación COS de fracción del suelo por tamaño de partículas al COS total.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Modeling soil organic carbon (SOC) dynamic can establish gains and losses associated with vegetation disturbance and management practices. In particular, the estimation of changes in carbon pools, labile and recalcitrant, without considering equilibrium states, raises the need for a distribution model of SOC in physical soil fractions (particle size) that can be parameterized with the information available on national inventories (total SOC and texture). This paper proposes a simplified model of SOC distribution, the product of mass balance between the fractions of soil carbon, which is seen as directly related to size of the particles and not to their mass distribution. The model was calibrated using a database of physical partitioning in Andosols , Cambisols and Acrisols in agricultural and forestry systems in Atécuaro, Michoacán, Mexico, considering only the SOC associated with organic part and total SOC (particulate + mineral). The distribution pattern of SOC by soil particle size was adjusted to experimental data. The model parts from known total SOC and SOC for a reference particle size, estimated experimentally or assumed. The results showed that, in the case of agricultural systems, the model fits well with the measurements (R2 &gt; 0.999). In the case of forest systems, estimates are good (R2 &gt; 0.97). Finally, implications of the developed model are reviewed; the classic concept of SOC saturation of the soil is questioned and explained in terms of the rates of decomposition and assimilation of the particulate and mineral fractions. Also, the relationships between soil texture and SOC associated to particle size is not supported, as texture (mass of soil fractions) is regarded as intrinsic to the relationship between SOC fraction of the soil by particle size and total SOC.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[fraccionamiento físico]]></kwd>
<kwd lng="es"><![CDATA[balance de masa]]></kwd>
<kwd lng="es"><![CDATA[dinámica del COS]]></kwd>
<kwd lng="es"><![CDATA[meta-equilibrio]]></kwd>
<kwd lng="en"><![CDATA[physical fractionation]]></kwd>
<kwd lng="en"><![CDATA[mass balance]]></kwd>
<kwd lng="en"><![CDATA[SOC dynamic]]></kwd>
<kwd lng="en"><![CDATA[meta-equilibrium]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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