<?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>S2007-11322024000100004</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v15i81.1421</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Vegetation life forms at treeline a high mountain forest in Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Formas de vida de la vegetación en el límite superior de un bosque de alta montaña en México]]></article-title>
</title-group>
<contrib-group>
<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[Alfaro-Ramírez]]></surname>
<given-names><![CDATA[Farid Uriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Albores]]></surname>
<given-names><![CDATA[Jorge Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plascencia-Escalante]]></surname>
<given-names><![CDATA[Francisca Ofelia]]></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[,Universidad Autónoma Agraria Antonio Narro Departamento de Botánica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Posgrado Forestal ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>81</numero>
<fpage>4</fpage>
<lpage>32</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322024000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322024000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322024000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of the present study was to characterize the diversity of life forms and plant community structure along an altitudinal gradient of the Pinus hartwegii treeline ecotone on Nevado de Toluca, Mexico. Plant species in the tree boundary ecotone were sampled, identified and quantified based on plant morphology under adverse conditions (life forms). The diversity of life forms in the ecotone was calculated using Shannon's diversity index and the structure was evaluated in terms of density and abundance of plant species. A total of 43 plant species belonging to 30 genera and 18 families were identified. Chamaefites were the most abundant life form (&gt;50 %); as altitude increased, life form diversity increased, while abundance decreased. Species diversity was proportionally and significantly (p&lt;0.05) related to increasing altitude along the treeline ecotone. The tree height and density of the Pinus hartwegii treeline ecotone diminished gradually along the treeline ecotone (diffuse form), which was characterized by more pronounced abiotic stress conditions at higher altitudes due to the altitudinal range sampled and because this ecotone represents the distribution limit of forest species and the beginning of grassland distribution. The diversity and distribution of life forms present in the P. hartwegii treeline ecotone may modify microenvironmental conditions or processes and, therefore, they regulate the response of other species associated with climate change.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo del presente estudio fue caracterizar la diversidad de las formas de vida y la estructura de la comunidad vegetal a lo largo de un gradiente altitudinal del ecotono del límite arbóreo de Pinus hartwegii en el Nevado de Toluca, México. Se muestrearon, identificaron y cuantificaron las especies vegetales con base en la morfología de la planta en condiciones adversas (formas de vida). La diversidad de formas de vida se calculó con el Índice de Diversidad de Shannon, y la estructura se evaluó en función de la densidad y abundancia de los taxa de plantas. Se identificaron 43 taxones pertenecientes a 30 géneros y 18 familias botánicas. Los caméfitos fueron la forma de vida más abundante (&gt;50 %). La diversidad de las formas de vida fue mayor a medida que aumentó la altitud, pero su abundancia disminuyó. La diversidad de especies se relacionó proporcional y significativamente (p&lt;0.05) con una altitud creciente a lo largo del ecotono del límite arbóreo. La altura y la densidad de los árboles de P. hartwegii decreció gradualmente a lo largo del gradiente muestreado (forma difusa), el cual se caracterizó por sus condiciones de más estrés abiótico a mayores altitudes, ya que este ecotono representa el límite de distribución de las especies forestales y el inicio de los pastizales. La diversidad y distribución de las formas de vida en el ecotono del límite arbóreo de P. hartwegii pueden modificar las condiciones o los procesos microambientales; por lo tanto, regulan la respuesta al cambio climático de otras especies asociadas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Alpine ecosystems]]></kwd>
<kwd lng="en"><![CDATA[altitudinal gradient]]></kwd>
<kwd lng="en"><![CDATA[altitudinal migration]]></kwd>
<kwd lng="en"><![CDATA[Climate change]]></kwd>
<kwd lng="en"><![CDATA[facilitation]]></kwd>
<kwd lng="en"><![CDATA[Nevado de Toluca]]></kwd>
<kwd lng="es"><![CDATA[Ecosistemas alpinos]]></kwd>
<kwd lng="es"><![CDATA[gradiente altitudinal]]></kwd>
<kwd lng="es"><![CDATA[migración altitudinal]]></kwd>
<kwd lng="es"><![CDATA[Cambio climático]]></kwd>
<kwd lng="es"><![CDATA[facilitación]]></kwd>
<kwd lng="es"><![CDATA[Nevado de Toluca]]></kwd>
</kwd-group>
</article-meta>
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