<?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>S2007-40182022000200289</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2021.04.024</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Population structure and spatial distribution of oregano (Lippia graveolens H. B. K.) at the Tehuacán-Cuicatlán Biosphere Reserve, Mexico.]]></article-title>
<article-title xml:lang="es"><![CDATA[Estructura poblacional y distribución espacial del orégano (Lippia graveolens H. B. K.) en la Reserva de la Biosfera Tehuacán-Cuicatlán, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-López]]></surname>
<given-names><![CDATA[Xareni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Herrera]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-García]]></surname>
<given-names><![CDATA[Mario V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cetina-Alcalá]]></surname>
<given-names><![CDATA[Víctor M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Conservación y Mejoramiento de Ecosistemas Forestales ]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>289</fpage>
<lpage>303</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182022000200289&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182022000200289&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182022000200289&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Oregano (Lippia graveolens H. B. K.) grows in semi-arid ecosystems. There is no information on the population dynamics of this species at the Tehuacán-Cuicatlán Biosphere Reserve (RBTC).  Objective:  To determine the vertical structure and spatial distribution of L. graveolens in five topographic conditions in the RBTC.  Materials and methods:  Ten sampling units were established in five topographic conditions (TC), where six plant height categories were defined. Density and structural variables were measured, from which IVI was obtained and population structure curves were constructed. The spatial distribution pattern was analyzed with the Ripley's transformed function (L  (t) ).  Results and discussion: TC1 showed population curve type IV (low frequency in the first, third and fourth height categories, high in the second and fifth categories, and low in the rest) with lower density (100 plants&#8729;ha-1; 1.6 %) in category 6 (&gt;251 cm), and higher density (1 840 plants&#8729;ha-1; 29 %) in category 4 (151 a 200 cm). For TC2 to TC5, the curve was V-type (low frequency in the first category, gradual increase up to the intermediate category, and gradual decrease in the rest) with lower density (20 plants&#8729;ha-1; 0.4 %) in category 6, and higher density (2 320 plants&#8729;ha-1; 51 %) in category 4 which also had the highest IVI (92.8 to 126.1). Spatial distribution was aggregated in TC1 to TC4 and randomized in TC5.  Conclusions: Topographic conditions influenced the vertical structure and spatial distribution of oregano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: El orégano (Lippia graveolens H. B. K.) crece en ecosistemas semiáridos. Hay nula información sobre la dinámica de poblaciones de esta especie en la Reserva de la Biosfera Tehuacán-Cuicatlán (RBTC).  Objetivo:  Determinar la estructura vertical y distribución espacial de L. graveolens en cinco condiciones topográficas en la RBTC.  Materiales y métodos: Diez unidades de muestreo se establecieron en cinco condiciones topográficas (CT), donde se definieron seis categorías de altura de las plantas. La densidad y las variables estructurales se midieron, con las cuales se obtuvo el IVI y se construyeron las curvas de estructura poblacional. El patrón de distribución espacial se analizó con la función transformada de Ripley (L  (t) ).  Resultados y discusión: La CT1 mostró curva poblacional tipo IV (frecuencia baja en la primera, tercera y cuarta categoría de altura, alta en la segunda y quinta, y baja en el resto) con densidad más baja (100 plantas&#8729;ha-1; 1.6 %) en la categoría 6 (&gt;251 cm), y densidad mayor (1 840 plantas&#8729;ha-1; 29 %) en la categoría 4 (151 a 200 cm). En la CT2 a CT5, la curva fue tipo V (frecuencia baja en la primera categoría, aumento gradual hasta la categoría intermedia y disminución gradual en el resto) con densidad más baja (20 plantas&#8729;ha-1; 0.4 %) en la categoría 6, y densidad mayor (2 320 plantas&#8729;ha-1; 51 %) en la categoría 4 que tuvo también el IVI más alto (92.8 a 126.1). La distribución espacial fue agregada en la CT1 a CT4 y aleatoria en la CT5.  Conclusiones: Las condiciones topográficas influyeron en la estructura vertical y distribución espacial de orégano.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Topographic conditions]]></kwd>
<kwd lng="en"><![CDATA[topoform]]></kwd>
<kwd lng="en"><![CDATA[exposure]]></kwd>
<kwd lng="en"><![CDATA[slope]]></kwd>
<kwd lng="en"><![CDATA[structural attributes]]></kwd>
<kwd lng="es"><![CDATA[condición topográfica]]></kwd>
<kwd lng="es"><![CDATA[topoforma]]></kwd>
<kwd lng="es"><![CDATA[exposición]]></kwd>
<kwd lng="es"><![CDATA[pendiente]]></kwd>
<kwd lng="es"><![CDATA[atributos estructurales]]></kwd>
</kwd-group>
</article-meta>
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