<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322025000400005</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v16i90.1553</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Soil organic carbon stocks along an elevation gradient in mountain forests of Pinus hartwegii Lindl.]]></article-title>
<article-title xml:lang="es"><![CDATA[Existencias de carbono orgánico del suelo a lo largo de un gradiente altitudinal en bosques de montaña de Pinus hartwegii Lindl.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo Arizmendi]]></surname>
<given-names><![CDATA[Lizbeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Suárez]]></surname>
<given-names><![CDATA[Marlín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas Hernández]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rozenberg]]></surname>
<given-names><![CDATA[Philippe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa Díaz]]></surname>
<given-names><![CDATA[Arian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de México Instituto de Ciencias Agropecuarias y Rurales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Institut National de Recherche Agronomique  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>France</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Conservación y Mejoramiento de Ecosistemas Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<volume>16</volume>
<numero>90</numero>
<fpage>87</fpage>
<lpage>112</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322025000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322025000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322025000400005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract High-elevation mountain forests (&gt;2 500 m) play a crucial role in long-term carbon storage. This research aimed to determine how edaphic, climatic, and vegetal variables influence soil organic carbon (SOC) stocks along an elevation gradient in the Pinus hartwegii forest at Nevado de Toluca, Mexico. A total of 140 topsoil samples (0-15 cm depth) were collected at 100 m intervals between 3 400 and 4 000 masl. Soil samples were analyzed to SOC (oxide-reduction method), bulk density (BD; cylinder method), pH, and texture (Bouyoucos method). In addition, climate data, including mean annual temperature and precipitation, were obtained from the ClimateNA model v5.10. Relationships among soil properties, vegetation structure, and climatic variables were analyzed, comparing logged (3 400-3 800 m) and unlogged (3 900-4 000 m) plots. SOC stocks increased linearly with elevation (r²=0.70; p=0.02), peaking at 4 000 m (173.1±5.2 Mg C ha-1) and reaching a minimum at 3 700 m (146.8±5.72 Mg C ha-1). Higher SOC at 4 000 m was associated with lower temperatures and larger P. hartwegii trees. Findings highlight that SOC stocks vary along the elevation gradient, with reduced decomposition rates at higher elevations promoting accumulation. At lower elevations, logging reduced SOC due to vegetation alterations, disrupting organic matter inputs and microsite conditions. These results suggest that P. hartwegii logging may weaken the role of mountain forest soils in mitigating climate change by accelerating soil organic matter decomposition.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los bosques de alta montaña (&gt;2 500 m) desempeñan un papel crucial en el almacenamiento de carbono a largo plazo. El objetivo de esta investigación fue determinar cómo las variables edáficas, climáticas y vegetales influyen en las existencias de carbono orgánico del suelo (COS) a lo largo de un gradiente altitudinal en el bosque de Pinus hartwegii en el Nevado de Toluca, México. Un total de 140 muestras de suelo superficial (0-15 cm de profundidad) fueron recolectadas a intervalos de 100 m entre los 3 400 y 4 000 m. El COS fue determinado por el método de óxido-reducción, y la densidad aparente (DA) por el método del cilindro. Se analizaron el pH (1:2 KCl) y la textura (método Bouyoucos) del suelo. Los datos climáticos, incluidas la temperatura media anual y las precipitaciones, se obtuvieron a partir del modelo ClimateNA v5.10. Se analizaron las relaciones entre las propiedades del suelo, la estructura de la vegetación y las variables climáticas, comparando parcelas taladas (3 400-3 800 m) y no taladas (3 900-4 000 m). Las existencias de COS aumentaron linealmente con la elevación (r  2 =0.70; p=0.02), y alcanzaron el máximo valor a los a 4 000 m (173.1±5.2 Mg C ha-1) y el mínimo a 3 700 m (146.8±5.72 Mg C ha-1). Un mayor COS a 4 000 m se asoció con temperaturas más bajas y árboles más grandes. La tala en cotas bajas redujo el COS debido a las alteraciones de la vegetación. Los hallazgos ponen de manifiesto que las reservas de COS varían a lo largo del gradiente de elevación, con menores tasas de descomposición a mayor altitud que favorecen la acumulación. La tala agrava la pérdida de COS al alterar los aportes de materia orgánica y las condiciones de los micrositios. Estos resultados sugieren que la tala puede debilitar el papel de los suelos forestales de montaña en la mitigación del cambio climático al acelerar la descomposición de la materia orgánica del suelo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Climate change]]></kwd>
<kwd lng="en"><![CDATA[elevation gradient]]></kwd>
<kwd lng="en"><![CDATA[herbaceous vegetation]]></kwd>
<kwd lng="en"><![CDATA[logging]]></kwd>
<kwd lng="en"><![CDATA[organic matter]]></kwd>
<kwd lng="en"><![CDATA[trees]]></kwd>
<kwd lng="es"><![CDATA[Cambio climático]]></kwd>
<kwd lng="es"><![CDATA[gradiente de elevación]]></kwd>
<kwd lng="es"><![CDATA[vegetación herbácea]]></kwd>
<kwd lng="es"><![CDATA[tala]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica]]></kwd>
<kwd lng="es"><![CDATA[árboles]]></kwd>
</kwd-group>
</article-meta>
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