<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802020000200205</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2020.2.205</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Crecimiento radial y conicidad del fuste en plantaciones con aclareo de Pinus patula SCHIEDE ex SCHLECHTENDAL &amp; CHAMISSO]]></article-title>
<article-title xml:lang="en"><![CDATA[Radial growth and stem tapering in thinned plantations of Pinus patula SCHIEDE ex SCHLECHTENDAL &amp; CHAMISSO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Cortés]]></surname>
<given-names><![CDATA[Luz Ma.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Hernández]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldrete]]></surname>
<given-names><![CDATA[Arnulfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Honorato-Salazar]]></surname>
<given-names><![CDATA[J. Amador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo Postgrado en Ciencias Forestales]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental San Martinito ]]></institution>
<addr-line><![CDATA[Tlahuapan Puebla]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>205</fpage>
<lpage>214</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802020000200205&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802020000200205&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802020000200205&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Pinus patula Schiede ex Schlechtendal &amp; Chamisso es una especie endémica de México, con gran relevancia económica por su alto potencial productivo en plantaciones forestales y bosques naturales. La intensidad y frecuencia de las cortas de aclareo generalmente influyen en el grueso de los anillos anuales de crecimiento, la proporción de madera tardía y la conicidad del fuste. El objetivo del presente estudio fue evaluar el crecimiento radial y el grueso de los anillos de crecimiento y de sus componentes de madera temprana y tardía a diferentes alturas del fuste, así como el índice de conicidad del fuste en plantaciones jóvenes de Pinus patula con cortas de aclareo aplicadas a los nueve y 13 años de edad. Se seleccionaron y derribaron 10 árboles por parcela con diámetro normal similar al valor promedio de éstas, para obtener tres secciones transversales (rodajas) de 3 cm de grueso a diferentes alturas de cada árbol muestreado. Las cortas de aclareo causaron un impacto reducido en el grueso de los anillos anuales y sus componentes de madera temprana y tardía en la sección basal. El efecto de la corta se presentó sólo al año siguiente de su aplicación, con incrementos en el área basal y en el grueso de madera temprana; después, el ritmo de crecimiento radial regresó a su patrón original. El grueso de los anillos y de la madera temprana y tardía fue mayor en la parte intermedia y superior del fuste, lo que ocasionó una reducción gradual en la conicidad, lo cual corroboró que la aplicación de las cortas de aclareo fue tardía, cuando la copa ya se había concentrado en la parte superior del árbol, por la elevada competencia por espacio de crecimiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Pinus patula Schiede ex Schlechtendal &amp; Chamisso is an endemic species of Mexico, with significant economic relevance due to its high productive potential in forest plantations and natural forests. The intensity and frequency of thinning cuts generally influence the thickness of the annual growth rings, the proportion of latewood, and the tapering of the stem. This study evaluated the radial growth and thickness of the growth rings and their earlywood and latewood components at different stem heights, as well as the stem taper index of young Pinus patula plantations with thinning cuts applied at nine and 13 years of age. Ten trees were selected and cut in each of two thinned plots with a diameter at breast height similar to that of the plot mean to obtain three 3-cm thick cross sections (slices) at different heights of each sampled tree. Thinning cuts reduced the impact on the thickness of the annual rings and their earlywood and latewood components at the basal section. The effect of the cut was only observable the year after the thinnings, with an increase in basal area and earlywood thickness; afterwards, the radial growth rate returned to its original pattern. The thickness of the rings and their earlywood and latewood components was higher at the middle and upper stem sections, causing a gradual reduction in stem tapering. This result confirmed that thinning cuts were performed late, when the crown had already concentrated at the top of the tree, due to high competition for growth space.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pinus patula]]></kwd>
<kwd lng="es"><![CDATA[anillos de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[competencia]]></kwd>
<kwd lng="es"><![CDATA[madera tardía]]></kwd>
<kwd lng="es"><![CDATA[madera temprana]]></kwd>
<kwd lng="es"><![CDATA[perfil del fuste]]></kwd>
<kwd lng="en"><![CDATA[Pinus patula]]></kwd>
<kwd lng="en"><![CDATA[competition]]></kwd>
<kwd lng="en"><![CDATA[earlywood]]></kwd>
<kwd lng="en"><![CDATA[growth rings]]></kwd>
<kwd lng="en"><![CDATA[latewood]]></kwd>
<kwd lng="en"><![CDATA[stem taper]]></kwd>
</kwd-group>
</article-meta>
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