<?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>2007-4018</journal-id>
<journal-title><![CDATA[Revista Chapingo serie ciencias forestales y del ambiente]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo ser. cienc. for. ambient]]></abbrev-journal-title>
<issn>2007-4018</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo, Coordinación de Revistas Institucionales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40182018000100073</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2017.09.056</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Maximum density and density management diagram for mixed-species forests in Durango, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Densidad máxima y diagrama de manejo de la densidad para bosques mezclados de Durango, México]]></article-title>
</title-group>
<contrib-group>
<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[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[Martínez-Salvador]]></surname>
<given-names><![CDATA[Martín]]></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[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[Santiago-García]]></surname>
<given-names><![CDATA[Wenceslao]]></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 Valle del Guadiana ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental San Martinito ]]></institution>
<addr-line><![CDATA[Tlahuapan Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Delicias ]]></institution>
<addr-line><![CDATA[Aldama Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Chetumal ]]></institution>
<addr-line><![CDATA[Chetumal Quintana Roo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad de la Sierra Juárez Instituto de Estudios Ambientales División de Estudios de Postgrado]]></institution>
<addr-line><![CDATA[Ixtlán de Juárez Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>73</fpage>
<lpage>90</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182018000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182018000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182018000100073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Stand density affects productivity and the structure and functions of forests.  Objectives:  To compare maximum density lines for mixed-species forests adjusted with ordinary least Squares (OLS) and Stochastic Frontier Regression (SFR); and generate a density management diagram (DMD) to prescribe thinning.  Materials and methods:  The data was obtained in mixed-species stands from the Forest Management Unit 1005 "Santiago Papasquiaro y Anexos" in Durango, Mexico. The density-size relationship was established using the Reineke&#8217;s model. The maximum density line was adjusted with OLS and SFR, the latter with the half-normal (H-N), normal-exponential (N-E) and normal-truncated (N-T) approaches. The DMD was constructed with the SFR equation with the normal-truncated distribution approach.  Results and discussion:  The maximum density line, modeled through SFR with N-T approach showed better fit to the upper limit of the maximum density of the mixed-species stand data. DMD suggests that thinning for these stands can be applied with high cutting intensities, contrary to conventional practices, where rarely more than 30 % of the basal area or volume is cut.  Conclusion:  The maximum density line for mixed-species forests in Durango, Mexico, was generated with stochastic frontier regression, as a normal-truncated model.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  La densidad del rodal impacta en la productividad y en la estructura y funciones de los bosques.  Objetivos:  Comparar las líneas de densidad máxima para bosques mezclados, ajustadas con mínimos cuadrados ordinarios (MCO) y regresión frontera estocástica (RFE), y generar un diagrama de manejo de la densidad (DMD) para prescribir aclareos.  Materiales y métodos:  Los datos se obtuvieron en rodales mezclados de la Unidad de Manejo Forestal 1005 &#8220;Santiago Papasquiaro y Anexos&#8221; en Durango, México. La relación funcional densidad-tamaño se estableció con el modelo de Reineke. La línea de densidad máxima se ajustó con MCO y RFE, este último con los enfoques seminormal (N-H), normal-exponencial (N-E) y normal-truncada (N-T). El DMD se construyó con la ecuación de RFE con el enfoque de distribución normal-truncada.  Resultados y discusión:  La línea de densidad máxima, modelada vía RFE con enfoque N-T, mostró mejor ajuste al límite superior de la densidad máxima de los datos de rodales mezclados. El DMD sugiere que los aclareos para estos rodales pueden aplicarse con intensidades de corta altas, contrariamente a las prácticas convencionales, donde raramente se remueve más del 30 % del área basal o volumen.  Conclusión:  La línea de densidad máxima para bosques mezclados de Durango, México, se generó objetivamente con regresión frontera estocástica, como un modelo normal-truncado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Self-thinning]]></kwd>
<kwd lng="en"><![CDATA[growth space]]></kwd>
<kwd lng="en"><![CDATA[Stand Density Index]]></kwd>
<kwd lng="en"><![CDATA[stochastic frontier regression]]></kwd>
<kwd lng="en"><![CDATA[Reineke]]></kwd>
<kwd lng="es"><![CDATA[Autoaclareo]]></kwd>
<kwd lng="es"><![CDATA[espacio de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[índice de densidad de rodales]]></kwd>
<kwd lng="es"><![CDATA[regresión frontera estocástica]]></kwd>
<kwd lng="es"><![CDATA[Reineke]]></kwd>
</kwd-group>
</article-meta>
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