<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952017000100105</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia clímatica en el reclutamiento de Pinus hartwegii Lindl. del ecotono bosque-pastizal alpino en Monte Tláloc, México]]></article-title>
<article-title xml:lang="en"><![CDATA[The influence of climate on Pinus hartwegii Lindl. recruitment at the alpine tree line ecotone in Monte Tlaloc, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Astudillo-Sánchez]]></surname>
<given-names><![CDATA[Claudia C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-Díaz]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Endara-Agramont]]></surname>
<given-names><![CDATA[Angel R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nava-Bernal]]></surname>
<given-names><![CDATA[Gabino E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Albores]]></surname>
<given-names><![CDATA[Miguel Á.]]></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[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria Relación Agua-Suelo-Planta-Atmósfera ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Ingeniería Centro Interamericano de Recursos del Agua]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>105</fpage>
<lpage>118</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El límite superior arbóreo de sitios elevados de México se espera que sea sensible al cambio climático. Por tal motivo se analizó el reclutamiento de Pinus hartwegii en el ecotono bosque-pastizal alpino de Monte Tláloc en el Estado de México, para detectar un posible avance del intervalo altitudinal de la especie a consecuencia del incremento en la temperatura. Para explorar la influencia del clima en el patrón de reclutamiento, se comparó la frecuencia de edades de P. hartwegii con relación a la temperatura y la precipitación; además, este impacto se analizó con la variación interanual en el grosor de anillos de crecimiento y su relación con los índices de El Niño-Oscilación del Sur (ENOS). La frecuencia de edades se fundamentó en un tamaño de muestra de 269 árboles, cuyos anillos de crecimiento se fecharon al año de su formación. El reclutamiento de P. hartwegii ha incrementado desde finales de la década de 1970, lo cual coincide con un aumento en la temperatura, en particular durante episodios El Niño. Esta situación se reflejó en un incremento radial inferior a la media en árboles ubicados por debajo del límite superior arbóreo. La detección de periodos húmedos en años previos a los de mayor reclutamiento podría implicar que no sólo bastan condiciones óptimas de temperatura a mayor altitud para promover un avance en la amplitud de la distribución de la especie, pero, además, el aporte de humedad debe ser suficiente para optimizar su desarrollo. La ausencia de sincronía entre el reclutamiento y el crecimiento radial de árboles establecidos a menor altitud, sugiere un efecto contrario del clima en el crecimiento de la especie, lo que implica un posible retraimiento de la amplitud altitudinal a largo plazo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The upper timberline in Mexico is expected to be sensitive to climate change. Therefore, Pinus hartwegii recruitment at Monte Tlaloc&#8217;s tree line ecotone, in the Estado de Mexico, was analyzed, in order to detect a possible progress in the altitude interval of the species, as a result of higher temperatures. To explore the influence of climate in the recruitment pattern, we compared the age frequency of P. hartwegii with temperature and rainfall; additionally, we analyzed this impact on the basis of the year to year change in the thickness of their growth rings and its relationship with the El Niño-Southern Oscillation (ENSO). The age frequency was based on a 269 trees simple; their growth rings were dated a year after they were formed. P. hartwegii recruitment has increased since the late 1970s, which matches the rise in temperature, especially during El Niño events. This situation was made evident by a lower radial increase than the mean of trees found below the upper timberline. The wet periods detected in the years before the greater recruitment years could imply that optimal temperature conditions at greater altitude are not enough to promote a progress in the wider distribution of the species, but that the wetness level must be enough to optimize its development. The lack of synchrony between the recruitment and the radial growth of trees established at lower altitudes suggests an opposite climate impact in the species&#8217; growth, which implies a possible long-term withdrawal of the altitude extent.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Anillos de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[región centro de México]]></kwd>
<kwd lng="es"><![CDATA[límite superior arbóreo]]></kwd>
<kwd lng="es"><![CDATA[El Niño-Oscilación del Sur (ENOS)]]></kwd>
<kwd lng="es"><![CDATA[Pinus hartwegii]]></kwd>
<kwd lng="en"><![CDATA[Growth rings]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[Mexico&#8217;s central region]]></kwd>
<kwd lng="en"><![CDATA[upper timberline]]></kwd>
<kwd lng="en"><![CDATA[El Niño-Southern Oscillation (ENOS)]]></kwd>
<kwd lng="en"><![CDATA[Pinus hartwegii]]></kwd>
</kwd-group>
</article-meta>
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