<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682023000200081</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.56.5</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Composición, estructura y estado de la regeneración arbórea en un gradiente altitudinal en un bosque templado de Guadalupe y Calvo, Chihuahua]]></article-title>
<article-title xml:lang="en"><![CDATA[Composition, structure and status of tree regeneration in an altitudinal gradient in a temperate forest of Guadalupe y Calvo, Chihuahua]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-García]]></surname>
<given-names><![CDATA[Samuel Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alanís-Rodríguez]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-Calderón]]></surname>
<given-names><![CDATA[Óscar Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Treviño-Garza]]></surname>
<given-names><![CDATA[Eduardo Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuéllar-Rodríguez]]></surname>
<given-names><![CDATA[Luis Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Costa]]></surname>
<given-names><![CDATA[Alejandro Collantes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Linares Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Campus Chetumal Bahía  ]]></institution>
<addr-line><![CDATA[Chetumal Quintana Roo]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<numero>56</numero>
<fpage>81</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682023000200081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682023000200081&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682023000200081&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El estudio de la vegetación en gradientes altitudinales permite comprender los efectos de los cambios ambientales en esta y orientar acciones de conservación y adaptación de las especies. El objetivo del estudio fue caracterizar la estructura horizontal y vertical, conocer la composición, riqueza, diversidad, el estado de regeneración arbórea y su relación con factores abióticos en un gradiente altitudinal (piso 1: 2200 - 2600 m, piso 2: 2600 - 2800 m y piso 3: 2800 - 3200 m) de bosque templado en Guadalupe y Calvo, Chihuahua, México. Se establecieron 37 parcelas de muestreo circulares de 1000 m2 en seis rodales, y dentro de estas dos parcelas rectangulares de 25 m2 para evaluar la regeneración. La riqueza se estimó con el índice de Margalef (D  Mg ), la diversidad con el índice de Shannon-Weiner (H&#8217;) y de diversidad verdadera (D&#8217;), y la similitud con el modelo de ordenación de Bray-Curtis. La estructura horizontal se evaluó con el Índice de Valor de Importancia (IVI), la estructura vertical con el Índice de Pretzsch (A) y la regeneración con la densidad (N ha-1). Se registraron 1,466 árboles de 16 especies, nueve géneros y seis familias; Pinaceae y Fagaceae fueron las de mayor presencia. El piso 3 fue el más diverso (D) y se encontró mayor similitud en composición entre los pisos 2 y 3. El IVI mostró que en el piso 1 las especies más típicas son Quercus sideroxyla (19.45%) y Pinus engelmannii (13.18%), los pisos 2 y 3 fueron Pseudotsuga menziesii (28.95 % y 22.06%) y Abies durangensis (27.20% y 45.56%). Los pisos 1 y 2 estuvieron dominados en altura por Pseudotsuga menziesii, mientras que el piso 3 por Abies durangensis. El índice A evidenció un declive de la diversidad estructural vertical al aumentar la altitud. Se observó buena regeneración de la mayoría de las especies en el piso 1 (92.86%), piso 2 (63.64%) y piso 3 (66.67%). Dentro de las principales conclusiones el gradiente altitudinal mostró similitud en la composición de especies, densidad y área basal debido a la dominancia de familias como Pinaceae y Fagaceae, también la diversidad estructural vertical de los pisos evaluados descendió con el aumento de la altitud y finalmente, de los factores abióticos tomados en cuenta el de mayor influencia en el establecimiento de regeneración fue la apertura de dosel.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The study of vegetation along altitudinal gradients allows understanding the effects of environmental changes and guiding conservation and adaptation actions for species. The objective was to characterize the horizontal and vertical structure, assess composition, richness, diversity, tree regeneration status, and its relationship with abiotic factors in an altitudinal gradient (floor 1: 2200-2600 m, floor 2: 2600-2800 m, and floor 3: 2800-3200 m) of temperate forest in Guadalupe y Calvo, Chihuahua, Mexico. Thirty-seven circular sampling sites of 1000 m2 were established within six stands, with two rectangular plots of 25 m2 for regeneration assessment. Richness was estimated using the Margalef index (D  Mg ), diversity with the Shannon-Weiner index (H') and true diversity (D&#8217;), and similarity with the Bray-Curtis ordination model. Horizontal structure was evaluated with the Importance Value Index (IVI), vertical structure with the Pretzsch Index (A), and regeneration with density (N ha-1). A total of 1,466 trees from 16 species, nine genera, and six families were recorded, with Pinaceae and Fagaceae being the most prevalent. Floor 3 showed the highest diversity (D), and greater compositional similarity was found between floors 2 and 3. IVI revealed that in floor 1, Quercus sideroxyla (19.45%) and Pinus engelmannii (13.18%) were the most typical species, while in floors 2 and 3, Pseudotsuga menziesii (28.95% and 22.06%) and Abies durangensis (27.20% and 45.56%) dominated, respectively. Floors 1 and 2 were dominated in height by Pseudotsuga menziesii, while floor 3 by Abies durangensis. The A index showed a decline in vertical structural diversity with increasing altitude. Good regeneration was observed for most species in floor 1 (92.86%), floor 2 (63.64%), and floor 3 (66.67%). In conclusion, the altitudinal gradient showed similarity in species composition, density, and basal area due to the dominance of families such as Pinaceae and Fagaceae. The vertical structural diversity of the evaluated floors decreased with increasing altitude, and among the considered abiotic factors, canopy openness had the greatest influence on regeneration establishment.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Riqueza]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[Mohinora]]></kwd>
<kwd lng="es"><![CDATA[Abies]]></kwd>
<kwd lng="es"><![CDATA[Pseudotsuga]]></kwd>
<kwd lng="es"><![CDATA[Pretzsch]]></kwd>
<kwd lng="en"><![CDATA[Abies]]></kwd>
<kwd lng="en"><![CDATA[Diversity]]></kwd>
<kwd lng="en"><![CDATA[Mohinora]]></kwd>
<kwd lng="en"><![CDATA[Pretzsch]]></kwd>
<kwd lng="en"><![CDATA[Pseudotsuga]]></kwd>
<kwd lng="en"><![CDATA[Richness]]></kwd>
</kwd-group>
</article-meta>
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<person-group person-group-type="author">
<name>
<surname><![CDATA[Yadav]]></surname>
<given-names><![CDATA[A. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gupta]]></surname>
<given-names><![CDATA[S. K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of micro-environment and human disturbance on the diversity of woody species in the Sariska Tiger Project in India]]></article-title>
<source><![CDATA[Forest Ecology and Management]]></source>
<year>2006</year>
<volume>225</volume>
<numero>1-3</numero>
<issue>1-3</issue>
<page-range>178-89</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
