<?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>S2007-11322022000600054</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v13i74.1257</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estructura y composición del bosque de Pinus hartwegii Lindl. en su distribución altitudinal en el Nevado de Toluca]]></article-title>
<article-title xml:lang="en"><![CDATA[Pinus hartwegii Lindl. forest, structure and composition along of its elevational distribution in the Nevado of Toluca]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Aguilar]]></surname>
<given-names><![CDATA[Griselda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Ángeles]]></surname>
<given-names><![CDATA[Gisela Virginia]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Agricultura Familiar ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico del Valle de Oaxaca División de Estudios de Posgrado e Investigación ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma del Estado de México Instituto de Ciencias Rurales y Agropecuarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>13</volume>
<numero>74</numero>
<fpage>54</fpage>
<lpage>76</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322022000600054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322022000600054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322022000600054&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Conocer la estructura y composición de un bosque, permite entender los atributos dasométricos de los árboles y los procesos ecosistémicos a lo largo de gradientes de vegetación derivados de la altitud. Se analizó la estructura del bosque de Pinus hartwegii en un gradiente de 600 m en el Nevado de Toluca. Se establecieron conglomerados de 1 ha en cada altitud y se registraron variables dasométricas. La estructura vertical y horizontal se evaluó con la densidad arbórea (DA), área basal (AB) y parámetros e índices estructurales. Estos últimos mostraron que P. hartwegii mantiene su abundancia y dominancia a lo largo del gradiente altitudinal estudiado, principalmente de los 3 700 a 4 000 m donde forma bosques monoespecíficos. La contribución en la estructura arbórea disminuyó de 100 % a 3 900 y 4 000 m, a 45 % en los 3 500 m. Los parámetros dasométricos indicaron mayor DA en individuos de clases diamétricas de 5-15 cm, y fue superior por debajo de los 3 800 m; ello evidenció que la regeneración puede ser más limitada a grandes altitudes, posiblemente debido a una extracción irregular del arbolado. Se concluye que la composición estructural del bosque de P. hartwegii presenta un cambio importante en su estructura de acuerdo con la altitud, lo que resultaría de la interacción ambiente-sociedad mediante la gestión del uso del suelo asociada a la altitud, y que compromete la estructura y función del ecosistema. Se recomienda incorporar la altitud como una variable determinante en planes de manejo para bosques de alta montaña.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Knowledge of the structure and composition of a forest makes it possible to understand the dasometric attributes of trees and ecosystem processes along altitude-derived vegetation gradients. The structure of the Pinus hartwegii forest was analyzed at an altitude of 600 m on the Nevado of Toluca. Clusters of 1 ha were established at each altitude; dasometric variables were registered. The vertical and horizontal structure was assessed based on the tree density (TD), basal area (BA), and structural parameters and indices. The latter showed that P. hartwegii maintains its abundance and dominance along the studied altitudinal gradient, mainly between 3 700 and 4 000 m, where it forms monospecific forests. The contribution to the tree structure decreased from 100 % at 3 900 and 4 000 m to 45 % at 3 500 m. The dasometric parameters indicated a higher TD in individuals in diameter classes of 5-15 cm at altitudes below 3 800 m; this showed that regeneration may be more limited at higher altitudes, possibly due to irregular tree removal. We conclude that the structural composition of the P. hartwegii forest shows an important change in its structure depending on the altitude, as a result of the environment-society interaction through altitude-related land use management, which compromises the structure and function of this ecosystem. We recommend incorporating altitude as a decisive variable in management plans for high-mountain forests.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Altitud]]></kwd>
<kwd lng="es"><![CDATA[bosques templados]]></kwd>
<kwd lng="es"><![CDATA[composición arbórea]]></kwd>
<kwd lng="es"><![CDATA[densidad arbórea]]></kwd>
<kwd lng="es"><![CDATA[procesos ecosistémicos]]></kwd>
<kwd lng="es"><![CDATA[valor de importancia ecológica]]></kwd>
<kwd lng="en"><![CDATA[Altitude]]></kwd>
<kwd lng="en"><![CDATA[temperate forests]]></kwd>
<kwd lng="en"><![CDATA[tree composition]]></kwd>
<kwd lng="en"><![CDATA[tree density]]></kwd>
<kwd lng="en"><![CDATA[ecosystem processes]]></kwd>
<kwd lng="en"><![CDATA[ecological importance value]]></kwd>
</kwd-group>
</article-meta>
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