<?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>S2007-11322021000100114</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v12i63.808</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Medición del índice de área foliar y su dinámica estacional en plantaciones de Eucalyptus urophylla S. T. Blake]]></article-title>
<article-title xml:lang="en"><![CDATA[Measurement of the leaf area index and its seasonal dynamics in Eucalyptus urophylla S. T. Blake plantations]]></article-title>
</title-group>
<contrib-group>
<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[Valdez Lazalde]]></surname>
<given-names><![CDATA[José René]]></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[Santos Posadas]]></surname>
<given-names><![CDATA[Héctor Manuel de los]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<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[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[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Saltillo ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Chetumal ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Woods Hole Research Center  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,GRANFLOR  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2021</year>
</pub-date>
<volume>12</volume>
<numero>63</numero>
<fpage>114</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322021000100114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322021000100114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322021000100114&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El índice de área foliar (IAF, m2 m-2) es un indicador de productividad en las plantaciones forestales y puede usarse para describir la respuesta de los árboles a la aplicación de prácticas silvícolas. El objetivo del estudio fue identificar un método preciso y eficiente para estimar el IAF en plantaciones forestales comerciales de Eucalyptus urophylla. Paralelamente, se analizó la dinámica estacional del IAF durante un año. Se establecieron 28 unidades de muestreo en las que se realizaron mediciones mensuales de IAF, con los métodos de recolección de hojarasca (IAF  Hojarasca ) y óptico (IAF  Óptico ). Además, se implementó un muestreo destructivo de 93 árboles para estimar el IAF mediante alométria (IAF  Alométrico ). Los valores promedio estimados de IAF fueron 2.7, 2.6 y 1.6 para el método alométrico, recolección de hojarasca y óptico, respectivamente. Esto implicó una subestimación promedio de 39 y 37 % del método óptico, en comparación con los métodos alométrico y de recolección de hojarasca. Un análisis de correlación de las estimaciones de IAF, obtenidas con los tres métodos aplicados, permitió identificar una alta asociación (r= 0.75, coeficiente de correlación de Pearson) entre los valores estimados con los métodos de recolección de hojarasca y óptico. Con base en este resultado (asociación) se ajustó un modelo de regresión, a fin de calibrar las mediciones indirectas (IAF  Óptico ) a un valor más preciso, IAF  Calibrado . El valor máximo de IAF se registró en julio y agosto, meses del mayor crecimiento para E. urophylla en condiciones de plantación comercial en México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Leaf area index (IAF, m2 m-2) is an indicator of productivity in forest plantations and can be used to describe the response of trees to the application of silvicultural practices. The objective of the study was to identify a precise and efficient method to estimate the IAF in commercial forest plantations of Eucalyptus urophylla. At the same time, the seasonal dynamics of the IAF was analyzed for one year. 28 sampling units were established in which monthly IAF measurements were made using the litter (IAF  Hojarasca ) and optical (IAF  Óptico ) collection methods. Additionally, a destructive sampling of 93 trees was implemented to estimate the IAF through allometry (IAF  Alométrico ). The estimated average values of IAF were 2.7, 2.6 and 1.6 for the allometric, litter collection, and optical methods, respectively. This implied an average underestimation of 39 and 37 % of the optical method compared to the allometric and litter collection methods, respectively. A correlation analysis of the IAF estimates, obtained through the three methods applied, allowed to identify a high association (r = 0.75, Pearson's correlation coefficient) between the values estimated with the litter collection and optical methods. Based on this result (association), a regression model was adjusted to calibrate IAF  Óptico values (indirect measurements) to more precise estimates, IAF  Calibrado . The maximum value of IAF was recorded during July and August, months of greatest growth for E. urophylla under commercial plantation conditions in Mexico.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Alometría]]></kwd>
<kwd lng="es"><![CDATA[área foliar]]></kwd>
<kwd lng="es"><![CDATA[fotografía hemisférica]]></kwd>
<kwd lng="es"><![CDATA[fracción de huecos]]></kwd>
<kwd lng="es"><![CDATA[hojarasca]]></kwd>
<kwd lng="es"><![CDATA[plantaciones forestales comerciales]]></kwd>
<kwd lng="en"><![CDATA[Allometry]]></kwd>
<kwd lng="en"><![CDATA[leaf area]]></kwd>
<kwd lng="en"><![CDATA[hemispheric photography]]></kwd>
<kwd lng="en"><![CDATA[gaps fraction]]></kwd>
<kwd lng="en"><![CDATA[leaf litter]]></kwd>
<kwd lng="en"><![CDATA[commercial forest plantations]]></kwd>
</kwd-group>
</article-meta>
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