<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982022000200331</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2912</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nicho de regeneración de Abies religiosa (Kunth) Schltdl. &amp; Cham. en el Monte Tláloc, Parque Nacional Iztaccíhuatl-Popocatépetl, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Regeneration niche of Abies religiosa (Kunth) Schltdl. &amp; Cham. on Mount Tláloc, Iztaccíhuatl-Popocatépetl National Park, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Ramírez]]></surname>
<given-names><![CDATA[Victor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Mata]]></surname>
<given-names><![CDATA[Lauro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Rodríguez]]></surname>
<given-names><![CDATA[Juan Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna Cavazos]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,aff1  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Agroecología ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>100</volume>
<numero>2</numero>
<fpage>331</fpage>
<lpage>344</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982022000200331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982022000200331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982022000200331&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Los factores físicos y biológicos involucrados en la supervivencia y riesgos de mortalidad de plántulas, son importantes para comprender los procesos naturales asociados con su establecimiento en un contexto espacio-temporal.  Objetivos:  Identificar qué factores ambientales definen el nicho de regeneración de Abies religiosa con base en la supervivencia y riesgos de mortalidad de sus plántulas.  Métodos:  Se establecieron 17 parcelas de 1 m2 y en ellas, todas las plántulas de la cohorte 2019 fueron localizadas, numeradas y medidas en altura, número de hojas embrionarias, número de nudos y daños visibles y seguidas durante un año. Se determinaron las propiedades del suelo circundante a las parcelas. En cada parcela, se tomaron fotografías hemisféricas y con base en ellas, el dosel se estratificó en dos categorías: parcialmente cerrado y abierto. Los análisis se realizaron con los procedimientos LIFETEST y LIFEREG de SAS.  Resultados:  Las curvas de supervivencia de las plántulas fueron distintas entre las categorías de dosel (Log-Rank: &#967;2 = 8.35, gl = 1, P &lt; 0.05). La probabilidad de supervivencia bajo dosel abierto fue mayor (0.29 ± 0.01) que bajo dosel parcialmente cerrado (0.20 ± 0.01). Las variables con efectos positivos en los tiempos de supervivencia fueron: altura y número de nudos; proporción de luz directa, densidad aparente del suelo, temperatura media, humedad media y su coeficiente de variación, y la variación de la saturación de humedad del suelo.  Conclusiones:  Estas covariables definen el nicho de regeneración de A. religiosa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  The physical and biological factors involved in the survival and mortality risks of seedlings are important to understand the natural processes associated with their establishment in a spatio-temporal context.  Objectives:  Identify which environmental factors define the regeneration niche of Abies religiosa based on the survival and mortality risks of its seedlings.  Methods:  Seventeen plots of 1 m2 were established and all the seedlings of the 2019 cohort were located, numbered and measured in height, number of embryonic leaves, number of nodes and visible damage and followed for a year. The properties of the soil surrounding the plots were determined. In each plot, hemispheric photographs were taken and based on them, the canopy was stratified into two categories: partially closed and open. Analyses were performed with the SAS LIFETEST and LIFEREG procedures.  Results:  The seedling survival curves were different between the canopy categories (Log-Rank: &#967;2 = 8.35, gl = 1, P &lt; 0.05). The probability of survival under open canopy was higher (0.29 ± 0.01) than under partially closed canopy (0.20 ± 0.01). The variables with positive effects on survival times were: height and number of nodes; proportion of direct sunlight, bulk density of the soil, mean temperature, mean humidity and its coefficient of variation, and the variation of the soil saturation point.  Conclusions:  These covariates define the regeneration niche of A. religiosa.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Análisis longitudinal]]></kwd>
<kwd lng="es"><![CDATA[demografía]]></kwd>
<kwd lng="es"><![CDATA[oyamel]]></kwd>
<kwd lng="es"><![CDATA[supervivencia]]></kwd>
<kwd lng="en"><![CDATA[Demography]]></kwd>
<kwd lng="en"><![CDATA[fir]]></kwd>
<kwd lng="en"><![CDATA[longitudinal analysis]]></kwd>
<kwd lng="en"><![CDATA[survival]]></kwd>
</kwd-group>
</article-meta>
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