<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322017000200069</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sistema de cubicación para árboles individuales de Quercus sp. en bosques bajo manejo de Puebla, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Cubing system for individual Quercus spp. trees in forests under management in Puebla, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamarit Urias]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Díaz]]></surname>
<given-names><![CDATA[Elba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiñonez Barraz]]></surname>
<given-names><![CDATA[Gerónimo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordoñez Prado]]></surname>
<given-names><![CDATA[Casimiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monárrez González]]></surname>
<given-names><![CDATA[José Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,INIFAP CIR - Golfo Centro Campo Experimental San Martinito]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,INIFAP Cenid Comef ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,INIFAP CIR - Norte Centro Campo Experimental Valle del Guadiana]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>40</numero>
<fpage>69</fpage>
<lpage>88</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322017000200069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322017000200069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322017000200069&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se procesaron datos de ahusamiento de 124 ejemplares del género Quercus. La muestra se obtuvo mediante método destructivo (derribo, desrame y seccionado) en bosques bajo manejo del estado de Puebla, México. Se colectaron 1 709 pares de datos diámetro-altura. Cada sección del árbol se cubicó con la fórmula de Smalian y la punta con la del cono; el volumen total por individuo se obtuvo sumando todas sus secciones cubicadas. Se evaluó la calidad de ajuste estadístico de seis modelos de ahusamiento de tipo segmentado y se eligió el de Fang et al. (2000), que describe mejor el perfil fustal. Este se ajustó, en forma simultánea, con su expresión de volumen comercial, mediante la técnica de modelos mixtos, y en el resultante se corrigió la heterocedasticidad ponderando la varianza de los errores con la función exponencial y un factor de ponderación en la altura comercial, solo para el ahusamiento; la autocorrelación se corrigió modelando el término de error, para ello se usó una estructura continua autorregresiva de primer orden (AR(1)). El sistema de cubicación, a nivel de árbol (SCAI), quedó conformado por ecuaciones que modelan el perfil fustal, estiman el volumen comercial y total, así como la altura comercial a un diámetro mínimo en la punta del fuste y viceversa. El SCAI permite calcular el volumen por tipo de producto según el uso industrial requerido, lo que posibilita realizar estimaciones volumétricas de encino por unidad de superficie.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Taper data of 124 specimens of the Quercus genus were processed. The sample was obtained using the destructive method (felling, limbing and sectioning) in forests under management in the state of Puebla, Mexico. 1 709 pairs of diameter-height data were collected. Each section of the tree was cubed using Smalian&#8217;s formula, and the tip by the cone volume formula. The total volume per individual was calculated by adding all its cubed sections. The quality of the statistical adjustment of six segmented taper models was assessed, and the model of Fang et al. (2000) was selected because it best describes the stem profile. The latter was simultaneously adjusted with its expression of commercial volume, using the mixed model technique, and the heteroskedasticity was corrected in the resulting model by weighting the error variance with the exponential function and with a weighting factor in the commercial height exclusively for the taper; the autocorrelation was corrected by modeling the error term; for this purpose, a first-order continuous autoregressive structure (AR(1)) was utilized. The cubing system for individual trees (CSIT) was formed by equations that model the stem profile and estimate the total and commercial volume, as well as the commercial height at a minimum diameter at the tip of the stem, and vice versa. The CSIT makes it possible to carry out volumetric estimations of oak trees per surface area unit.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bosque de encino]]></kwd>
<kwd lng="es"><![CDATA[distribución de productos]]></kwd>
<kwd lng="es"><![CDATA[modelo de ahusamiento]]></kwd>
<kwd lng="es"><![CDATA[perfil fustal]]></kwd>
<kwd lng="es"><![CDATA[sistema de cubicación individual]]></kwd>
<kwd lng="es"><![CDATA[volumen comercial]]></kwd>
<kwd lng="en"><![CDATA[Oak forest]]></kwd>
<kwd lng="en"><![CDATA[product distribution]]></kwd>
<kwd lng="en"><![CDATA[taper model]]></kwd>
<kwd lng="en"><![CDATA[stem profile]]></kwd>
<kwd lng="en"><![CDATA[individual cubing system]]></kwd>
<kwd lng="en"><![CDATA[commercial volume]]></kwd>
</kwd-group>
</article-meta>
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