<?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>S0187-73802021000100085</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.1.85</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelos proxy para biomasa de fuste de Pseudotsuga menziesii (Mirb.) Franco: método de Pressler]]></article-title>
<article-title xml:lang="en"><![CDATA[Proxy models for Pseudotsuga menziesii (Mirb.) Franco stem biomass: Pressler method]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Hernández]]></surname>
<given-names><![CDATA[Cristóbal de J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-González]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Pérez]]></surname>
<given-names><![CDATA[Félix de J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce-Martínez]]></surname>
<given-names><![CDATA[Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Díaz]]></surname>
<given-names><![CDATA[Citlali]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-Encina]]></surname>
<given-names><![CDATA[Fátima M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro  ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UAAAN Departamento Forestal ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,aff3  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>85</fpage>
<lpage>93</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000100085&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000100085&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000100085&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La evaluación precisa de la biomasa de árboles es necesaria para estimar los almacenes de carbono y entender la contribución de los ecosistemas de bosques en la regulación de las emisiones de gases de efecto invernadero. El objetivo de este estudio fue desarrollar una ecuación alométrica para predecir la biomasa del fuste (Bf) para Pseudotsuga menziesii (Mirb.) Franco, en la región de Arteaga Coahuila, en el noreste de México. El diámetro normal (Dn), la altura al punto directriz (Hp) y la altura total (Ht) fueron medidos con el Criterion RD1000®. El volumen del fuste (Sv) fue obtenido con la ecuación de Pressler y después fue trasformado a biomasa mediante la densidad básica de la madera. Los datos se ajustaron con el modelo potencial &#374; = aXb en su forma logarítmica, donde &#374; es Sb y X el Dn evaluando los supuestos de normalidad, homocedasticidad y no autocorrelación. Un total de 110 árboles de esta especie fueron muestreados. La ecuación  l n (   B f &#94; )= &#8722;2.8732 (± 0.238) + 2.4237 (± 0.066) × ln(Dn) cumplió todos los supuestos de los modelos lineales (valor de P &gt; 0.05), lo que asegura que la predicción de biomasa de fuste sea confiable. El diámetro normal explicó el 98 % de la biomasa del fuste de P. menziesii. El sesgo en la predicción de biomasa del fuste debido a la trasformación logarítmica debe corregirse multiplicándola por un factor de corrección de 1.018. La estimación indirecta de volumen a través del método de Pressler es una forma eficiente, de bajo costo y no destructiva para generar un modelo alométrico de biomasa de fuste.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Accurate assessment of tree biomass is necessary to estimate carbon stocks and understand the contribution of forest ecosystems in regulating greenhouse gas emissions. The objective of this study was to develop an allometric equation to predict stem biomass (Bf) for Pseudotsuga menziesii (Mirb.) Franco, in the Arteaga Coahuila region, in northeastern Mexico. The normal diameter (Dn), leader point height (Hp) and total height (Ht) were measured by using Criterion RD1000®. The stem volume (Sv) was obtained by applying the Pressler equation, and then it was transformed into biomass using the basic density of the wood. The data were adjusted through the potential model &#374; = aXb in its logarithmic form, where &#374; is Sb and X the Dn, assessing the assumptions of normality, homoscedasticity and no autocorrelation. A total of 110 sample trees of this species were sampled. The equation  l n (   B f &#94; )= &#8722;2.8732 (± 0.238) + 2.4237 (± 0.066) × ln(Dn) fulfilled all the assumptions of lineal models (P- value &gt; 0.05), ensuring that the stem biomass prediction is reliable. Normal diameter explained 98 % of the stem biomass of P. menziesii. The bias in the stem biomass prediction due to the logarithmic transformation must be corrected by multiplying it by a correction factor of 1.018. Indirect volume estimation by the Pressler method is an efficient, low-cost and non-destructive approach to generate an allometric model of stem biomass.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pseudotsuga menziesii]]></kwd>
<kwd lng="es"><![CDATA[alometría]]></kwd>
<kwd lng="es"><![CDATA[biomasa]]></kwd>
<kwd lng="es"><![CDATA[carbono]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[método Pressler]]></kwd>
<kwd lng="en"><![CDATA[Pseudotsuga menziesii]]></kwd>
<kwd lng="en"><![CDATA[allometry]]></kwd>
<kwd lng="en"><![CDATA[biomass]]></kwd>
<kwd lng="en"><![CDATA[carbon]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[Pressler method]]></kwd>
</kwd-group>
</article-meta>
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