<?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>S2007-11322023000400117</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v14i78.1330</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ecuaciones de razón de volumen para Pinus oocarpa Schiede ex Schltdl. del estado de Nayarit, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Ratio volume equations of Pinus oocarpa Schiede ex Schltdl. from Nayarit State, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simental Serrano]]></surname>
<given-names><![CDATA[Luis Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Díaz]]></surname>
<given-names><![CDATA[José Ciro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wehenkel]]></surname>
<given-names><![CDATA[Christian A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto Ruíz]]></surname>
<given-names><![CDATA[José Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nájera Luna]]></surname>
<given-names><![CDATA[Juan Abel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de El Salto División de Estudios de Posgrado e Investigación ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Ciencias Forestales y Ambientales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Instituto de Silvicultura e Industria de la Madera ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>14</volume>
<numero>78</numero>
<fpage>117</fpage>
<lpage>140</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322023000400117&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322023000400117&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322023000400117&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las ecuaciones de razón de volumen son una opción viable para estimar con precisión el volumen comercial maderable de las especies forestales. El objetivo del presente estudio fue evaluar el ajuste de tres modelos de volumen comercial asociados a la razón de la altura y tres de ahusamiento para conformar un sistema de ecuaciones de volumen comercial-ahusamiento para Pinus oocarpa en el estado de Nayarit. Los datos provienen de la medición de 76 árboles para ajustar los modelos y 20 para validarlos. El ajuste se hizo con PROC MODEL, y se aplicaron regresiones aparentemente no relacionadas (SUR) en el software estadístico SAS 9.2. Los estadísticos de ajuste fueron el Coeficiente de Determinación Ajustado, Raíz del Cuadrado Medio del Error, Coeficiente de Variación y Criterio de Información de Akaike; los de validación fueron el sesgo promedio, error absoluto promedio, porcentaje de la diferencia agregada, Coeficiente de Determinación, Raíz del Cuadrado Medio del Error y los valores del parámetro de la pendiente de la regresión lineal entre datos observados y estimados. El Coeficiente de Determinación y la Raíz del Cuadrado Medio del Error que resultaron del ajuste del mejor modelo de volumen comercial fueron 0.9727 y 0.0651, mientras que los del mejor modelo de ahusamiento fueron 0.9579 y 2.7797. En conclusión, el proceso de validación permitió seleccionar al sistema de ecuaciones de volumen comercial y ahusamiento S2 como el mejor para estimar el volumen y el diámetro a cualquier altura del fuste para P. oocarpa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Ratio volume equations are precise mathematical alternatives to estimate merchantable volume of tree species. The objective of the present study was to evaluate the goodness of fit of three commercial volume models associated to height ratio and three taper models to conform a commercial volume-taper equations system of Pinus oocarpa growing at the state of Nayarit, Mexico. To carry out this study, 76 trees were selected for models fitting and 20 for validation over the entire study area. The models were fitted applying seemingly unrelated regression (SUR) in the statistic software SAR 9.2. The goodness of fit of the models was evaluated throughout the comparison of the Coefficient of determination, Root mean square error, Coefficient of variation and Akaike Information Criterium; meanwhile, it was considering the mean bias, absolute mean error, aggregate difference in percentage, Coefficient of determination, Root mean square error and the value of the slope parameter of a lineal regression model for equations validation. The Coefficient of determination and Root mean square error of the best commercial volume model were 0.9727 and 0.0651, and for taper models were 0.9579 and 2.7797, respectively. The validation process allowed to select the commercial volume and taper equations system S2 as the best to estimate volume and diameter at any stem height of P. oocarpa.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ahusamiento]]></kwd>
<kwd lng="es"><![CDATA[Pinus oocarpa Schiede ex Schltdl.]]></kwd>
<kwd lng="es"><![CDATA[Schumacher-Hall]]></kwd>
<kwd lng="es"><![CDATA[volumen comercial]]></kwd>
<kwd lng="es"><![CDATA[volumen de razón]]></kwd>
<kwd lng="es"><![CDATA[volumen total]]></kwd>
<kwd lng="en"><![CDATA[Tree taper]]></kwd>
<kwd lng="en"><![CDATA[Pinus oocarpa Schiede ex Schltdl.]]></kwd>
<kwd lng="en"><![CDATA[Schumacher-Hall]]></kwd>
<kwd lng="en"><![CDATA[commercial volume]]></kwd>
<kwd lng="en"><![CDATA[ratio volume]]></kwd>
<kwd lng="en"><![CDATA[total volume]]></kwd>
</kwd-group>
</article-meta>
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