<?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>S2007-11322016000300007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores de proporción y ecuaciones de diámetro normal a partir del tocón para Pinus greggii Engelm]]></article-title>
<article-title xml:lang="en"><![CDATA[Ratio factors and normal diameter equations from the stump diameter of Pinus greggii Engelm]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Ramos]]></surname>
<given-names><![CDATA[Jonathan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Cuevas]]></surname>
<given-names><![CDATA[Xavier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Magaña]]></surname>
<given-names><![CDATA[José Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz Flores]]></surname>
<given-names><![CDATA[Hipólito Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velarde Ramírez]]></surname>
<given-names><![CDATA[Juan Cosme]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olvera Delgadillo]]></surname>
<given-names><![CDATA[Edgar Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Asesori&#769;a Técnica Forestal (ATF)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Comisión Nacional de Áreas Naturales Protegidas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>35</numero>
<fpage>7</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322016000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322016000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322016000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Cuando se desconocen las dimensiones del diámetro normal (dn) de los árboles para calcular el volumen, la relación funcional entre dn y diámetro de tocón (dt) es muy útil. El objetivo del presente estudio consistió en generar ecuaciones y factores de proporción de dn-dt para plantaciones de Pinus greggii en el estado de Hidalgo, México. Con datos de 621 árboles se ajustaron cuatro modelos para estimar la relación dn-dt con el PROC MODEL del paquete estadístico SAS 9.1 y el procedimiento gmm. El mejor modelo fue seleccionado mediante el Coeficiente de Determinación Ajustado (R2 ), la Raíz del Error Medio Cuadrático (REMC), los criterios aj. de información de Akaike (AIC) y Bayesiano (BIC), el análisis gráfico de los residuales y la prueba de normalidad. La capacidad predictiva se determinó con el Sesgo (E), la Desviación Agregada (DA) y la DA en porcentaje (DA %), además del comportamiento gráfico de los valores predichos contra los observados. La ecuación seleccionada incluyó la altura del tocón (ht) y explicó 94.86 % de la varianza observada, sin violar los supuestos de normalidad de los datos, homocedasticidad de los residuos y la autocorrelación de los errores. El sesgo fue de -0.0352, la DA de -0.0353 y la DA % de 0.2032 para la muestra. El factor de proporción promedio entre dt y dn fue de 0.7879. Esta ecuación y el factor de proporción son herramientas confiables para la estimación del dn, y es aplicable como base en la estimación de volumen, biomasa o carbono en plantaciones de P. greggii.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract When normal diameter (dn) of trees for volume calculations are unknown, the functional relationship between dn and stump diameter (dt ) is very useful. The aim of this study was to generate equations and dn-dt ratio factors for Pinus greggii plantations in the state of Hidalgo , Mexico. With the data from 621 trees, four models were fitted to estimate the dn-dt relation to the PROC MODEL SAS 9.1 statistical package and the gmm procedure.The best model was selected by the fitted Coefficient of Determination (R2 aj. ), the Root Mean Square Error (REMC), the Akaike (AIC) and Bayesian (BIC) information criteria, the graphical analysis of the residuals and the normality test. Predictability was determined with the bias (E), Aggregate Deviation (DA ) and DA percentage (DA %), in addition to the graphical behavior of the predicted values against the observed ones. The selected equation included stump height (ht ) and explained 94.86 % of the observed variance, without violating the assumptions of normality of the data, residual homoscedasticity and the autocorrelation of errors. For the sample, the bias was -0.0352, -0.0353 for DA and 0.2032 for DA %. The average ratio factor between dt and dn was 0.7879. This equation and the ratio factor are reliable tools for estimating dn, and may be applied as the basis for estimating volume, biomass or carbon in P. greggii plantations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Alometría]]></kwd>
<kwd lng="es"><![CDATA[aprovechamientos]]></kwd>
<kwd lng="es"><![CDATA[biomasa arbórea]]></kwd>
<kwd lng="es"><![CDATA[corta clandestina]]></kwd>
<kwd lng="es"><![CDATA[ecuaciones]]></kwd>
<kwd lng="es"><![CDATA[volumen]]></kwd>
<kwd lng="en"><![CDATA[Allometry]]></kwd>
<kwd lng="en"><![CDATA[logging]]></kwd>
<kwd lng="en"><![CDATA[tree biomass]]></kwd>
<kwd lng="en"><![CDATA[illegal cutting]]></kwd>
<kwd lng="en"><![CDATA[equations]]></kwd>
<kwd lng="en"><![CDATA[volume]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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