<?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>0188-4611</journal-id>
<journal-title><![CDATA[Investigaciones geográficas]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. Geog]]></abbrev-journal-title>
<issn>0188-4611</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geografía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-46112025000200104</article-id>
<article-id pub-id-type="doi">10.14350/rig.61016</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Dinámica de la línea de árboles en el Volcán Iztaccíhuatl en México]]></article-title>
<article-title xml:lang="en"><![CDATA[Dynamics of the Tree Line on Iztaccíhuatl volcano in México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán Vázquez]]></surname>
<given-names><![CDATA[Itzel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galicia]]></surname>
<given-names><![CDATA[Leopoldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geografía ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<numero>117</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46112025000200104&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46112025000200104&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46112025000200104&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los procesos que explican la dirección y la velocidad de la migración de la línea de árboles, particularmente en altas altitudes, son aspectos escasamente estudiados. En el volcán Iztaccíhuatl, perteneciente al Eje Neovolcánico Mexicano, la línea de árboles se presenta alrededor de los 4,000 msnm, aunque se ha evidenciado su avance este no ha sido homogéneo, probablemente debido a las irregularidades topográficas propias de los sistemas montañosos. Este estudio evalúa el papel de las variaciones de temperatura, radiación y humedad del suelo derivadas de aspectos topográficos como la elevación, la pendiente, la orientación y la sombra orográfica en la dinámica de la línea de árboles a través de los siguientes objetivos: i) comparar la posición de la línea de árboles en el volcán Iztaccíhuatl durante el periodo comprendido entre 1985 y 2020, y ii) analizar el impacto de las condiciones topográficas y ambientales en los movimientos de la línea de árboles. Utilizamos imágenes satelitales Landsat y realizamos un modelo de clasificación supervisada para identificar la línea de árboles como el límite entre el bosque y el pastizal. Para analizar los factores que condicionan la dinámica de la línea de árboles, clasificamos los principales ambientes según características topográficas (elevación, pendiente, orientación y sombra orográfica) y variables ambientales (temperatura, radiación descendente, la radiación ascendente y el índice de humedad del suelo (SMI)). Identificamos siete grupos de ambientes basados en variables topográficas y ambientales. Nuestros resultados indican un avance generalizado en la línea de árboles hacia mayores altitudes (32 m en promedio hasta 2014), con retrocesos localizados en laderas empinadas noroeste (temperaturas bajas: 10.18 °C; humedad reducida: SMI 0.62). Por el contrario, los avances predominaron en pendientes suaves y orientaciones noreste, asociadas a temperaturas moderadas (16-18 °C) y mayor humedad (SMI: 1.26). La dinámica de la línea de árboles en el Volcán Iztaccíhuatl responde a una combinación compleja entre condiciones térmicas y de humedad, moduladas por la topografía. Pendientes pronunciadas y orientaciones desfavorables promueven la mortalidad probablemente por congelamiento o desecación, mientras que áreas con microclimas más cálidos y húmedos favorecen el establecimiento y crecimiento de árboles. Esto sugiere que no solo el calentamiento, sino que múltiples factores determinan la dirección y velocidad del límite de los árboles en las montañas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The processes driving the direction and speed of tree line migration, particularly at high altitudes, remain poorly understood. On Iztaccíhuatl Volcano, part of the Trans-Mexican Volcanic Belt, the tree line occurs around 4,000 m a.s.l. Although upward shifts have been documented, advancement has been heterogeneous, likely due to the topographic complexity of mountain systems. This study evaluates how temperature, radiation, and soil moisture variations-mediated by topographic features (elevation, slope, aspect, and orographic shading)-influence tree line dynamics through two objectives: (i) comparing the tree line position on Iztaccíhuatl between 1985 and 2020, and (ii) analyzing the impact of topographic and environmental conditions on tree line movements. Using Landsat satellite imagery, we applied a supervised classification model to delineate the tree line as the forest-grassland boundary. To assess driving factors, we classified environments based on topographic (elevation, slope, aspect, orographic shade) and environmental variables (temperature, downward/upward radiation, and Soil Moisture Index [SMI]). Seven distinct environment groups were identified. Results reveal an overall upward tree line shift (average: +32 m by 2014), with localized retreats on steep northwest slopes (cold temperatures: 10.18°C; low moisture: SMI 0.62). In contrast, advances predominated on gentle northeast slopes, linked to moderate temperatures (16-18°C) and higher moisture (SMI: 1.26). Tree line dynamics on Iztaccíhuatl volcano reflect a trade-off between thermal and moisture conditions, modulated by topography. Steep slopes and unfavorable aspects likely promote mortality through freezing or desiccation, while warmer, wetter microclimates enhance tree establishment and growth. This suggests that not only warming, but multiple factors, determine the direction and speed of the tree line in the mountains.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[análisis geográfico]]></kwd>
<kwd lng="es"><![CDATA[bosques de coníferas]]></kwd>
<kwd lng="es"><![CDATA[línea de árboles]]></kwd>
<kwd lng="es"><![CDATA[Volcán Iztaccíhuatl]]></kwd>
<kwd lng="es"><![CDATA[micrositio]]></kwd>
<kwd lng="es"><![CDATA[Pinus hartwegii]]></kwd>
<kwd lng="es"><![CDATA[topografía]]></kwd>
<kwd lng="es"><![CDATA[clasificación supervisada]]></kwd>
<kwd lng="en"><![CDATA[geographic analysis]]></kwd>
<kwd lng="en"><![CDATA[coniferous forests]]></kwd>
<kwd lng="en"><![CDATA[tree line]]></kwd>
<kwd lng="en"><![CDATA[Iztaccíhuatl Volcano]]></kwd>
<kwd lng="en"><![CDATA[microsite]]></kwd>
<kwd lng="en"><![CDATA[Pinus hartwegii]]></kwd>
<kwd lng="en"><![CDATA[topography]]></kwd>
<kwd lng="en"><![CDATA[supervised classification]]></kwd>
</kwd-group>
</article-meta>
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