<?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>1405-0471</journal-id>
<journal-title><![CDATA[Madera y bosques]]></journal-title>
<abbrev-journal-title><![CDATA[Madera bosques]]></abbrev-journal-title>
<issn>1405-0471</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-04712020000200200</article-id>
<article-id pub-id-type="doi">10.21829/myb.2020.2621933</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Composición y estructura espacial de cinco asociaciones de bosques de Pinus durangensis]]></article-title>
<article-title xml:lang="en"><![CDATA[Composition and spatial structure of five associations of forests of Pinus durangensis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Graciano-Ávila]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alanís-Rodríguez]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio-Camacho]]></surname>
<given-names><![CDATA[Ernesto A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdecantos-Dema]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-Calderón]]></surname>
<given-names><![CDATA[Oscar A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Tagle]]></surname>
<given-names><![CDATA[Marco A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Treviño-Garza]]></surname>
<given-names><![CDATA[Eduardo Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corral-Rivas]]></surname>
<given-names><![CDATA[José Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Olivo]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Linares Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Tepatitlán de Morelos Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Estudios Ambientales del Mediterráneo  ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Alicante Departamento de Ecología ]]></institution>
<addr-line><![CDATA[Alicante ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Autónoma de Tamaulipas Instituto de Ecología Aplicada ]]></institution>
<addr-line><![CDATA[Cd. Victoria Tamaulipas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-04712020000200200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-04712020000200200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-04712020000200200&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La estructura espacial refleja el patrón de disposición de los árboles sobre el terreno y es un elemento básico para entender la dinámica de los ecosistemas forestales. El objetivo de la presente investigación fue evaluar las características estructurales bivariadas de cinco asociaciones diferentes de bosques de Pinus durangensis, identificando las similitudes y diferencias en la distribución bivariada de uniformidad de ángulos, dominancia y mezcla. Los datos provienen de cinco sitios cuadrados con superficie de 2500 m2, establecidos cada uno en diferentes bosques de P. durangensis en la Sierra Madre Occidental. Para cada sitio se determinó altura promedio, diámetro promedio y cobertura de copa, así como índices de mezcla de especies, uniformidad de ángulos y dominancia. Los índices se combinaron dos a dos para obtener tres distribuciones bivariantes. El bosque puro de P. durangensis presentó los individuos con mayor altura, mientras que el mayor diámetro fue para la asociación con P. teocote. El índice de mezcla (Mi) indica que solo en el bosque puro existe una baja mezcla de especies. El índice de uniformidad de ángulos (Wi) muestra que los árboles, de manera general, tienen una distribución aleatoria. Los valores de dominancia (Ui) muestran que en todos los sitios existen todas las clases sociales representadas de manera equitativa. Los índices y sus combinaciones describen adecuadamente la distribución espacial de los árboles y su relación con sus vecinos más cercanos. La información obtenida de la combinación de las variables estructurales contribuye a mejorar la comprensión de la estructura espacial del bosque y contribuye a la regulación de la intensidad de corta y garantizar una gestión sostenible.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The spatial structure reflects the pattern of arrangement of trees on the ground and is a basic element to understand the dynamics of forest ecosystems. The objective of the present investigation was to evaluate the bivariate structural characteristics of five different associations of Pinus durangensis forests, identifying the similarities and differences in the bivariate distribution of uniformity of angles, dominance and mingling. The data comes from five quadrate sites with an area of 2500 m2, each established in different forests of P. durangensis in the Sierra Madre Occidental. For each site, the average height, average diameter and crown coverage were determined, as well as the species mingling index, angle uniformity and dominance indexes. The indices were combined two to two to obtain three bivariate distributions. The pure forest of P. durangensis presented individuals with higher height, while the largest diameter was found in the association with P. teocote. The mingling index (Mi) indicates that only in the pure forest there is a low species mingling. The uniformity angle index (Wi) shows that trees generally present a random distribution. The values of dominance (Ui) show that in all the sites there are all the social classes represented in an equitable way. The indexes and their combinations adequately describe the spatial distribution of the trees and their relationship with their closest neighbors. The information obtained from the combination of the structural variables contribute to improve the understanding of the spatial structure of the forest, and in addition to contributing to the regulation of cutting intensity and ensuring sustainable management.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[dinámica de ecosistemas forestales]]></kwd>
<kwd lng="es"><![CDATA[distribución bivariada]]></kwd>
<kwd lng="es"><![CDATA[dominancia]]></kwd>
<kwd lng="es"><![CDATA[mezcla]]></kwd>
<kwd lng="es"><![CDATA[uniformidad]]></kwd>
<kwd lng="en"><![CDATA[forest ecosystem dynamics]]></kwd>
<kwd lng="en"><![CDATA[bivariate distribution]]></kwd>
<kwd lng="en"><![CDATA[dominance]]></kwd>
<kwd lng="en"><![CDATA[mixture]]></kwd>
<kwd lng="en"><![CDATA[uniformity]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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