<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952017000500561</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación del volumen comercial en plantaciones de Eucalyptus urophylla con modelos de volumen total y de razón]]></article-title>
<article-title xml:lang="en"><![CDATA[Eucalyptus urophylla merchantable volume estimation with total volume and ratio models]]></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[Santos-Posadas]]></surname>
<given-names><![CDATA[Héctor M. De los]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdéz-Lazalde]]></surname>
<given-names><![CDATA[José R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamarit-Urias]]></surname>
<given-names><![CDATA[Juan C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángeles-Pérez]]></surname>
<given-names><![CDATA[Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Ramos]]></surname>
<given-names><![CDATA[Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-Lopez]]></surname>
<given-names><![CDATA[Benjamin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peduzzi]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Tlahuapan Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Woods Hole Research Center  ]]></institution>
<addr-line><![CDATA[Falmouth MA]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>5</numero>
<fpage>561</fpage>
<lpage>580</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000500561&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000500561&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000500561&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para el manejo técnico y aprovechamiento de plantaciones forestales comerciales (PFC), es fundamental el conocimiento de las relaciones funcionales entre el diámetro normal (dn) y la altura (A) con el volumen total (Vt) de un árbol, además de la proporción de distintas alturas comerciales (Ai) o diámetros mínimos (di) a lo largo del fuste con el volumen comercial (Vc). Con la hipótesis de que con tales relaciones expresadas matemáticamente es posible realizar estimaciones precisas de Vt y Vc, el objetivo fue proponer una herramienta para cuantificar el Vt y Vc en PFC de Eucalyptus urophylla procedentes de semilla y clones en el sureste mexicano a través de funciones de razón volumétrica (r). Con información dasométrica de 175 árboles de clones medidos en 2007 (P1), 93 en 2014 (P2) y 459 provenientes de semilla y medidos en 2007 (P3), se evaluaron seis modelos de Vt, ajustados y corregidos por heterocedasticidad ponderando la varianza, y diez de razón corrigiendo la autocorrelación con una estructura autoregresiva. El modelo de Schumacher-Hall con inclusión de variables dicotómicas demostró que las poblaciones son diferentes estadísticamente. Los mejores modelos de Vt fueron el de Schumacher-Hall para P1 y P3 y el de Spurr para P2; en los de r que consideran el diámetro a distintas alturas, el modelo de Burkhart fue el mejor para P1 y P2 y el de Cao para P3. Para los modelos que utilizan la altura en el fuste, el de Zepeda fue el adecuado para las tres poblaciones. Con estos modelos de Vt y r, por población se determinó el Vc a cualquier di o Ai establecidos, que explicaron más de 94 % de la variabilidad. El índice de esbeltez fue 114, 122 y 118 cm cm-1 y el factor de forma fue 0.45, 0.34 y 0.34 para P1, P2 y P3.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The functional relationships between diameter at breast height (dn) and height (A) with the total volume (Vt) of a tree is essential for the technical management and exploitation of commercial forest plantations (PFC), along with the rate of different commercial heights (Ai) or minimum diameters (di) along the bole with the merchantable volume (Vc). Based on the hypothesis that with such mathematically-expressed relationships it is possible to accurately estimate Vt and Vc, the objective was to propose a tool to quantify the Vt and Vc in Eucalyptus urophylla PFCs from seed and clones in southeastern Mexico, by means of volume-ratio functions (r). Six Vt models -fitted and corrected for heteroscedasticity taking variance into consideration- and ten ratio models -correcting autocorrelation with an autoregressive structure- were evaluated using dasometric information from 175 clone trees measured in 2007 (P1), 93 in 2014 (P2), and 459 in 2007 (P3); the third group was grown from seeds. The Schumacher-Hall model -which includes dichotomous variables- showed that populations are statistically different. The best Vt models were: Schumacher-Hall for P1 and P3, and Spurr for P2. The best r models -which consider the diameter at different heights- were: Burkhart for P1 and P2, and Cao for P3. When bole height models are used, Zepeda&#8217;s was the most appropriate for the three populations. With these Vt and r models, each population&#8217;s Vc was determined at any given di or Ai, which accounted for more than 94 % of the variability. The slenderness ratio was 114, 122, and 118 cm cm-1 and the form factor was 0.45, 0.34, and 0.34 for P1, P2 and P3, respectively.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Perfil fustal]]></kwd>
<kwd lng="es"><![CDATA[ahusamiento]]></kwd>
<kwd lng="es"><![CDATA[plantaciones forestales]]></kwd>
<kwd lng="es"><![CDATA[distribución de productos]]></kwd>
<kwd lng="es"><![CDATA[Eucalyptus urophylla]]></kwd>
<kwd lng="en"><![CDATA[stem profile]]></kwd>
<kwd lng="en"><![CDATA[taper]]></kwd>
<kwd lng="en"><![CDATA[forest plantations]]></kwd>
<kwd lng="en"><![CDATA[product distribution]]></kwd>
<kwd lng="en"><![CDATA[Eucalyptus urophylla]]></kwd>
</kwd-group>
</article-meta>
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