<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000300443</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.3.443</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Allometric equations for belowground biomass and carbon content of Pinus patula Schl. et Cham.]]></article-title>
<article-title xml:lang="es"><![CDATA[Ecuaciones alométricas para biomasa y contenido de carbono subterráneo de Pinus patula Schl. et Cham.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medrano-Meraz]]></surname>
<given-names><![CDATA[Frinet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-López]]></surname>
<given-names><![CDATA[Miguel Á.]]></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[Cruz-Cobos]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jozeph-de-Jong]]></surname>
<given-names><![CDATA[Bernardus H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Texcoco Edo. de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de El Salto División de Estudios de Posgrado e Investigación ]]></institution>
<addr-line><![CDATA[El Salto Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,El Colegio de la Frontera Sur Departamento de Ciencias de la Sustentabilidad ]]></institution>
<addr-line><![CDATA[Lerma Campeche]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>3</numero>
<fpage>443</fpage>
<lpage>454</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000300443&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000300443&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000300443&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Allometric equations are essential tools for estimating biomass and carbon fixation in forest ecosystems. Published information is limited for belowground biomass of forests, mainly due to the methodological challenges of its determination. With the aim of contributing to the study of this important carbon store, in the present study allometric equations were developed for the estimation of belowground biomass of Pinus patula Schiede ex Schldl. et Cham. in its main natural distribution area: the states of Hidalgo, Puebla and Veracruz, Mexico. Seven Pinus patula trees with varying dimensions were selected and torn down at various sites; their diameter at breast height (DBH), total height (H), and crown diameter (CD) were measured. The totality of fine and coarse roots was extracted; the aboveground biomass was quantified by census, by sampling or by means of an allometric equation. Equations were developed for belowground biomass and carbon content, both total and by components, as well as for individual root, both total and by components. The average root/shoot ratio was 0.20 and the proportion of belowground in relation to the total biomass ranged from 12.1 to 21.2 %. The data on belowground biomass and carbon content at the tree level better fitted the Schumacher and Hall model that included both DBH and H as independent variables, which explained 99% of the variation of belowground biomass and carbon. It was concluded that it is possible to use allometric equations to estimate the belowground biomass and carbon of Pinus patula trees from DBH and H, or even using only DBH.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las ecuaciones alométricas son herramientas esenciales para estimar la biomasa y la fijación de carbono en los ecosistemas forestales. La información publicada es limitada para la biomasa subterránea de bosques, debido a los desafíos metodológicos que representa su determinación. Con el objetivo de contribuir al estudio de este importante almacen de carbono, en el presente estudio se desarrollaron ecuaciones alométricas para la estimación de biomasa subterránea de Pinus patula Schiede ex Schldl. et Cham. en el área principal de distribución natural: los estados de Hidalgo, Puebla y Veracruz, México. Se seleccionaron y derribaron en diversos sitios siete árboles de Pinus patula con dimensiones variadas; se midió su diámetro a la altura de pecho (DAP), altura total (AT) y diámetro de copa (DC). Se extrajo la totalidad de las raíces finas y gruesas; la biomasa aérea se cuantificó por censo, muestreo o mediante una ecuación alométrica. Se desarrollaron ecuaciones para biomasa subterránea y contenido de carbono totales y por componentes, así como para raíz individual total y por componentes. El cociente de raíz/parte aérea promedio fue de 0.20 y la proporción de biomasa subterránea con respecto a la biomasa total por árbol varió de 12.1 a 21.2 %. Los datos de biomasa subterránea y contenido de carbono total a nivel de árbol se ajustaron mejor al modelo Schumacher y Hall, que incluye el DAP y AT como variables independientes, y explicaron el 99% de la variación en biomasa y carbono subterráneo. Se concluyó que es posible usar ecuaciones alométricas para estimar la biomasa y carbono subterráneo de árboles de Pinus patula a partir del DAP y AT, o incluso usando solo el DAP.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pinus patula]]></kwd>
<kwd lng="en"><![CDATA[aboveground biomass]]></kwd>
<kwd lng="en"><![CDATA[carbon fixation]]></kwd>
<kwd lng="en"><![CDATA[coarse roots]]></kwd>
<kwd lng="en"><![CDATA[fine roots]]></kwd>
<kwd lng="en"><![CDATA[root/shoot ratio]]></kwd>
<kwd lng="es"><![CDATA[Pinus patula]]></kwd>
<kwd lng="es"><![CDATA[biomasa aérea]]></kwd>
<kwd lng="es"><![CDATA[cociente raíz/parte aérea]]></kwd>
<kwd lng="es"><![CDATA[fijación de carbono]]></kwd>
<kwd lng="es"><![CDATA[raíces finas]]></kwd>
<kwd lng="es"><![CDATA[raíces gruesas]]></kwd>
</kwd-group>
</article-meta>
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