<?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>S2007-40182019000100031</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2018.06.049</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Identification of defects and risks in trees of San Juan de Aragon Forest, Mexico City]]></article-title>
<article-title xml:lang="es"><![CDATA[Identificación de defectos y riesgos en el arbolado del Bosque de San Juan de Aragón, Ciudad de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saavedra-Romero]]></surname>
<given-names><![CDATA[Luz de L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Rosales]]></surname>
<given-names><![CDATA[Dionicio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Trinidad]]></surname>
<given-names><![CDATA[Tomás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-de la Rosa]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Fitosanidad-Fitopatología ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>25</volume>
<numero>1</numero>
<fpage>31</fpage>
<lpage>47</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182019000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182019000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182019000100031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Urban forests require an assessment of their trees&#8217; structural defects, as well as the risk they represent.  Objective:  To identify the defects and risks of the trees in San Juan de Aragon Forest in Mexico City.  Materials and methods:  Twenty-eight circular plots of 0.1 ha were randomly established. Diameter at breast height, total height and slenderness index were measured in each tree. Structural defects were identified and a risk rating (RR) was obtained at the individual, species and section level using the methods of Matheny and Clark, and Dunster.  Results and discussion:  Of the 760 trees evaluated, Casuarina equisetifolia L., Grevillea robusta A. Cunn. ex R. Br. and Hesperocyparis lusitanica Mill. were the most frequent species with diameter classes from 7.6 to 15.1 cm, heights from 5.1 to 10 m and slenderness index from 26 to 75. Structural damage was identified in 38.7 % of the trees: lean (18.8 %), cankers (15.4 %), epicormic shoots (14.4 %), dead branches (9.9 %), tumors (9.2 %) and cavities (6.2 %). Casuarina equisetifolia and Schinus molle had the highest number of defects. With the Matheny and Clark method, 83.9 % of the trees had a low RR, 14.7 % a medium RR and 1.4 % a high RR; with Dunster's method, 88.1 % had a low RR, 11.3 % a medium RR and 0.68 % a high RR.  Conclusion:  The procedures for evaluating and identifying trees at risk of failure allowed recognizing their main structural defects in a simple way.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los bosques urbanos requieren de la evaluación de los defectos estructurales de su arbolado, así como del riesgo que representan.  Objetivo:  Identificar los defectos y riesgo del arbolado del Bosque de San Juan de Aragón en la Ciudad de México.  Materiales y métodos:  Se establecieron, aleatoriamente, 28 parcelas circulares de 0.1 ha. El diámetro normal, altura total e índice de esbeltez se midieron en cada árbol. Los defectos estructurales se identificaron y una calificación de riesgo se obtuvo a nivel individual, por especie y sección, usando los métodos de Matheny y Clark, y de Dunster.  Resultados y discusión:  De los 760 árboles evaluados, Casuarina equisetifolia L., Grevillea robusta A. Cunn. ex R. Br. y Hesperocyparis lusitanica Mill. fueron las especies más frecuentes con clases diamétricas de 7.6 a 15.1 cm, alturas de 5.1 a 10 m e índice de esbeltez de 26 a 75. Se identificaron daños estructurales en 38.7 % de los árboles: inclinación (18.8 %), cancros (15.4 %), brotes epicórmicos (14.4 %), ramas muertas (9.9 %), tumores (9.2 %) y cavidades (6.2 %). Casuarina equisetifolia y Schinus molle tuvieron el mayor número de defectos. Con el método Matheny y Clark, 83.9 % de los árboles tuvieron calificación de riesgo bajo, 14.7 % de riesgo medio y 1.4 % de riesgo alto; mientras que con el método de Dunster, 88.1 % fueron de riesgo bajo, 11.3 % de riesgo medio y 0.68 % de riesgo alto.  Conclusión:  Los procedimientos para la evaluación e identificación de árboles de riesgo permitieron identificar sus principales defectos estructurales de manera sencilla.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[urban forest]]></kwd>
<kwd lng="en"><![CDATA[structural damage]]></kwd>
<kwd lng="en"><![CDATA[Matheny and Clark method]]></kwd>
<kwd lng="en"><![CDATA[Dunster method]]></kwd>
<kwd lng="es"><![CDATA[Bosque urbano]]></kwd>
<kwd lng="es"><![CDATA[daño estructural]]></kwd>
<kwd lng="es"><![CDATA[método Matheny y Clark]]></kwd>
<kwd lng="es"><![CDATA[método Dunster]]></kwd>
</kwd-group>
</article-meta>
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