<?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>S1405-31952017000800921</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biomasa aérea y factores de expansión en plantaciones forestales comerciales de Eucalyptus urophylla S. T. Blake]]></article-title>
<article-title xml:lang="en"><![CDATA[Aboveground biomass and expansion factors in commercial forest plantations of Eucalyptus urophylla S. T. Blake]]></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[H. Manuel De los]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdez-Lazalde]]></surname>
<given-names><![CDATA[J. René]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamarit-Urias]]></surname>
<given-names><![CDATA[J. Carlos]]></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[Peduzzi]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrero]]></surname>
<given-names><![CDATA[Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo 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[,United States Department of Agriculture Forest  ]]></institution>
<addr-line><![CDATA[Ogden Utah]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Proteak  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>8</numero>
<fpage>921</fpage>
<lpage>938</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000800921&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000800921&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000800921&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La biomasa aérea es fundamental para determinar la cantidad de carbono almacenado en la cubierta forestal. Una forma de obtener estimaciones precisas de biomasa aérea es mediante factores de expansión, que utilizan datos de volumen de árboles en pie, tomados durante el inventario forestal. El objetivo de este estudio fue estimar la biomasa aérea total y por componente estructural a partir de modelos alométricos y factores de expansión de biomasa (FEB), y evaluar la aplicabilidad en inventarios forestales para clones de Eucalyptus urophylla S. T. Blake de plantaciones forestales comerciales en Tabasco, México. Mediante un muestreo al azar en siete plantaciones se seleccionaron 93 árboles, de uno a siete años de edad, y se determinó la biomasa total y de los componentes estructurales. Dos sistemas de modelos alométricos ajustados se propusieron como ecuaciones aparentemente no relacionadas para estimar la biomasa aérea. El porcentaje promedio de biomasa de fuste (B  f ), ramas (B  r ) y follaje (B  h ) fue 91.42, 5.54 y 2.03 respecto a la biomasa total (B  t ). La proporción B  f aumentó con las dimensiones del árbol y B  r y B  h disminuyeron desde los tres años de edad. El FEB promedio de B  t y B  f fue 510.09 kg m-3 y 472.56 kg m-3 de volumen de fuste y el factor de conversión biomasa de fuste a biomasa total fue 1.17. Con datos de un inventario forestal se estimaron en promedio 156.08 m3 ha-1 de volumen maderable y 80 Mg ha-1 de biomasa aérea en las plantaciones. Los estadísticos de ajuste, sesgo y diferencia agregada en porcentaje indicaron que los sistemas propuestos son confiables para la estimación de biomasa aérea.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Aboveground biomass is critical to assess the amount of carbon stored in forest covers. One way to obtain accurately estimates of the aerial biomass is through expansion factors, which use standing trees volume data, taken during forest inventories. Our objective in this study is to estimate total and structural aerial biomass using allometric models and biomass expansion factors (FEB), in order to evaluate their applicability in forest inventories for Eucalyptus urophylla S. T. Blake clones in commercial forest plantations at Tabasco, Mexico. Random samplings on seven plantations was utilized to select 93 trees, from one to seven years old trees, from which the total biomass and structural components were determined. We propose two systems allometric models fitted as seemingly unrelated equations in order to estimate aerial biomass. The average bole biomass percentage (B  s ), branches (B  b ) and foliage (B  f ) was of 91.42, 5.54 and 2.03 respect to the total biomass (B  t ). The B  s ratio increased with tree size and B  b and B  f decreased after three years. The average FEB of the B  t and B  s was 510.09 kg m-3 and 472.56 kg m-3 of bole volume. The biomass conversion factor from the bole to total biomass was 1.17. Data from a forest inventory allowed to estimate an average of 156.08 m-3 ha-1 of timber volume and 80 Mg ha-1 of aerial biomass in the plantations. The fitting, bias and percentage of aggregate difference statistics indicated that the proposed systems are reliable for aerial biomass estimation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[celulósicos]]></kwd>
<kwd lng="es"><![CDATA[Eucalyptus urophylla]]></kwd>
<kwd lng="es"><![CDATA[inventarios forestales]]></kwd>
<kwd lng="es"><![CDATA[manejo forestal]]></kwd>
<kwd lng="es"><![CDATA[relaciones alométricas]]></kwd>
<kwd lng="en"><![CDATA[cellulosic]]></kwd>
<kwd lng="en"><![CDATA[Eucalyptus urophylla]]></kwd>
<kwd lng="en"><![CDATA[forest inventories]]></kwd>
<kwd lng="en"><![CDATA[forest management]]></kwd>
<kwd lng="en"><![CDATA[allometric relations]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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