<?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>S2007-11322023000300076</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v14i77.1383</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sistemas compatibles de ahusamiento y volumen comercial para dos especies de Pinus en Durango, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Taper and merchantable volume systems for two Pinus species in Durango, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Cobos]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiñonez-Barraza]]></surname>
<given-names><![CDATA[Gerónimo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Merino]]></surname>
<given-names><![CDATA[Verónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corral-Rivas]]></surname>
<given-names><![CDATA[Sacramento]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nava-Nava]]></surname>
<given-names><![CDATA[Adan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de El Salto  ]]></institution>
<addr-line><![CDATA[ Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Centro de Investigación Regional Norte Centro ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>14</volume>
<numero>77</numero>
<fpage>76</fpage>
<lpage>102</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322023000300076&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322023000300076&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322023000300076&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El estudio tuvo como objetivo comparar y validar dos metodologías para estimar el volumen comercial de Pinus cooperi (Pc) y Pinus durangensis (Pd) en la región forestal de El Salto, Durango, México. Los datos de ahusamiento y volumen utilizados fueron de 164 y 182 árboles de Pc y Pd, respectivamente; a los cuales se les midió el diámetro a diferentes alturas. De la base de datos, 70 % se usó para el ajuste y 30 % para la validación. Cuatro sistemas compatibles de ahusamiento y volumen comercial fueron ajustados: tres de razón de volúmenes y uno segmentado. El ajuste se realizó mediante regresión iterativa aparentemente no relacionada. Los criterios para evaluar la calidad de ajuste fueron: el coeficiente de determinación ajustado, la raíz del cuadrado medio del error, el sesgo, el criterio de información de Akaike y el coeficiente de variación. Los estadísticos de ajuste y de validación indicaron que el sistema segmentado (SS1) fue el más preciso para estimar el volumen comercial y ahusamiento para ambas especies. El sistema basado en modelos de razón de volúmenes (RVS2) generó resultados similares, constituyó un sistema con más parsimonia, y explicó 98.3 % de la variabilidad observada en Pc y 97.6 % en Pd, y podría ser más fácil de implementar que el segmentado para predecir la altura del fuste, el diámetro del fuste, el volumen comercial y el volumen total del árbol para los dos taxones estudiados. Por tanto, se recomienda el sistema etiquetado como RVS2 por su precisión y simplicidad para estimar volúmenes comerciales de las especies evaluadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of the study was to compare and validate two methodologies in order to estimate the merchantable volume of Pinus cooperi (Pc) and Pinus durangensis (Pd) in the forest region of El Salto, Durango, Mexico. The used data were 164 Pc and 182 Pd trees, whose diameters at different heights and the total height were measured. The 70 % of the dataset was used for training, and 30 % was utilized for testing. Four compatible taper and merchantable volume systems were fitted, three of which were based on volume ratio models, and one, on a segmented taper model. The fitting was performed through iterative seemingly unrelated regression. The criteria for evaluating predictive performance were the adjusted coefficient of determination, the root mean square error, the bias, the Akaike&#8217;s information criterion, and the coefficient of variation. The training and testing statistics indicated that the segmented system (SS1) was the most accurate for estimating the merchantable volume and taper of both species. The system based on volume ratio models (RVS2) generated similar results, was more parsimonious and explained 98.3 % of the observed variability in Pc and 97.6 % of that observed in Pd; furthermore, it may prove easier to implement than segmented system for predicting the stem height, stem diameter, merchantable volume, and total tree volume for two studied species. The system labeled RVS2 is recommended for its accuracy and simplicity in estimating the merchantable volume of the evaluated species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ahusamiento]]></kwd>
<kwd lng="es"><![CDATA[modelos de razón de volúmenes]]></kwd>
<kwd lng="es"><![CDATA[parsimonia]]></kwd>
<kwd lng="es"><![CDATA[sistema compatible]]></kwd>
<kwd lng="es"><![CDATA[volumen comercial]]></kwd>
<kwd lng="es"><![CDATA[volumen total]]></kwd>
<kwd lng="en"><![CDATA[Tapering]]></kwd>
<kwd lng="en"><![CDATA[volume ratio models]]></kwd>
<kwd lng="en"><![CDATA[parsimony]]></kwd>
<kwd lng="en"><![CDATA[compatible system]]></kwd>
<kwd lng="en"><![CDATA[merchantable volume]]></kwd>
<kwd lng="en"><![CDATA[total volume]]></kwd>
</kwd-group>
</article-meta>
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