<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952007000700711</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acumulación de carbono orgánico en el suelo en reforestaciones de Pinus michoacana]]></article-title>
<article-title xml:lang="en"><![CDATA[Accumulation of soil organic carbon in Pinus michoacana reforestations]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luis-Mejía]]></surname>
<given-names><![CDATA[Salomón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Guerrero]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etchevers-Barra]]></surname>
<given-names><![CDATA[Jorge D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángeles-Pérez]]></surname>
<given-names><![CDATA[Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-López]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Horwath]]></surname>
<given-names><![CDATA[William R.]]></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[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de California Campus Davis ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<numero>7</numero>
<fpage>711</fpage>
<lpage>721</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952007000700711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952007000700711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952007000700711&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La transferencia de carbono estabilizado de la vegetación al suelo es un proceso importante para abatir las concentraciones elevadas de CO2 atmosférico. El objetivo de este trabajo fue calcular la masa de nuevo carbono orgánico del suelo (NCOS) incorporada como resultado del establecimiento de reforestaciones con Pinus michoacana. Se estudiaron parcelas con cultivo de maíz, en las cuales una porción del área se reforestó con pino. La cantidad de NCOS se calculó a partir de las diferencias en composición de isótopos (&#948;13 C) del suelo y tejido vegetal, en una cronosecuencia, con el modelo simple de mezclas. Los resultados indicaron diferencias estadísticas (p&#8804;0.001) en &#948;13 C entre el grupo de parcelas de maíz y las reforestaciones. La proporción de NCOS fue 62 y 18%, en las profundidades de 0-5 y 5-10 cm en reforestaciones de 20 años. El ajuste de los datos por densidad aparente y el uso de un modelo cuadrático indicó que la masa promedio de incorporación de NCOS es 11.2 y 2.30 Mg ha&#8722;1 a los 20 años, y tasas de acumulación de 0.561 y 0.11 Mg ha&#8722;1 año&#8722;1 en las mismas profundidades. No se encontró NCOS desde pinos en profundidades mayores a 10 cm, lo que sugiere una dinámica de carbono más alta en el suelo superficial.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The transfer of stable carbon from vegetation to the soil is an important process for reducing elevated concentrations of atmospheric CO2. The objective of the present study was to calculate the mass of new soil organic carbonic (NSOC) incorporated as a result of the establishment of reforestation with Pinus michoacana. Plots sown with corn were studied, in which a portion of the area was reforested with pine. The amount of NSOC was calculated from the differences in composition of isotopes (&#948;13 C) from the soil and plant tissue, in a chronosequence, with the simple mixture model. Results indicated statistical differences (p&#8804;0.001) in &#948;13 C between the group of corn plots and the reforestations. The amount of NSOC was 62 and 18%, in the depths of 0-5 and 5-10 cm in reforestations of 20 years. The fit of the data by apparent density and the use of a quadratic model indicated that the average mass of NSOC incorporation is 11.2 and 2.30 Mg ha&#8722;1 at 20 years, and the accumulation rates are 0.561 and 0.11 Mg ha&#8722;1 year&#8722;1 at the same depths. No NSOC from pine was found at depths of over 10 cm, which suggests a higher carbon dynamic in the superficial soil.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[&#948;13C]]></kwd>
<kwd lng="es"><![CDATA[cronosecuencias en andosoles]]></kwd>
<kwd lng="es"><![CDATA[isótopos estables]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica del suelo]]></kwd>
<kwd lng="en"><![CDATA[&#948;13 C]]></kwd>
<kwd lng="en"><![CDATA[chronosequences in andisols]]></kwd>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="en"><![CDATA[soil organic matter]]></kwd>
</kwd-group>
</article-meta>
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