<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322024000600101</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v15i86.1447</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Absorción de Nitrógeno inorgánico en rodales de Pinus hartwegii Lindl. en diferentes altitudes y exposiciones]]></article-title>
<article-title xml:lang="en"><![CDATA[Inorganic Nitrogen uptake in Pinus hartwegii Lindl. stands at different altitudes and exposures]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa Díaz]]></surname>
<given-names><![CDATA[Arian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Guerrero]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Horwath]]></surname>
<given-names><![CDATA[William R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<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[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of California Department of Land Air and Water Resources ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>86</numero>
<fpage>101</fpage>
<lpage>122</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322024000600101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322024000600101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322024000600101&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para comprender el ciclo del N en los ecosistemas de Pinus hartwegii es importante investigar sobre el movimiento de este elemento en dichos bosques para proponer estrategias de manejo forestal sustentadas en el conocimiento de procesos biogeoquímicos. Este trabajo muestra resultados de un experimento de fertilización con árboles jóvenes de dicha especie, en el cual se determinó la absorción de dos formas de Nitrógeno: amonio y nitrato. Se usaron dos fuentes con 15N: sulfato de amonio y nitrato de potasio, enriquecidas a 49.2 y 56.7 %, respectivamente. Los factores de variación incluyeron dos altitudes (3 500 y 3 900 m) y dos exposiciones (noroeste y suroeste), con un experimento factorial 23. Adicionalmente se evaluó la evolución de la mineralización del N anual del suelo superficial (10 cm). Los resultados indican que el porcentaje de Nitrógeno foliar, derivado de las fuentes con 15N (NDDF), fue mayor al suroeste, pero la recuperación neta en masa de 15N fue superior al noroeste (P&lt;0.05), debido a la mayor masa foliar en esta exposición. La absorción de nitrato superó a la de amonio en 63 % (P&lt;0.05). La mineralización del N edáfico, con respecto a la altitud y exposición, no mostró una tendencia definida. P. hartwegii se adapta a las condiciones estacionales para la adquisición de ambas formas de N, lo que le ha permitido colonizar sitios adversos de alta montaña. Los rodales de P. hartwegii en bajas altitudes (3 500 m) y con exposiciones suroeste son más susceptibles a las alteraciones del ciclo del N.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract To understand the N cycle in Pinus hartwegii ecosystems, it is important to investigate the movement of this element in these forests to propose forest management strategies based on knowledge of biogeochemical processes. This paper shows results of an experiment with young Pinus harwtegii trees to study the uptake of two N forms, ammonium and nitrate. N uptake was measured using 15N sources of ammonium sulfate and potassium nitrate, with enrichments of 49.2 and 56.7%, respectively. The variation factors included two elevation levels (3 500 and 3 900 m) and two slope aspects (Northwest and Southwest), composing a 23 factorial experiment. In addition, surface soil N mineralization (10 cm) was evaluated over a year in the same sites. Results indicate that the percentage of Nitrogen derived from the labeled source (NDDF) in foliage was higher in the Southwest exposure. However, the net mass recovery of 15N was higher in the Northwest sites (P&lt;0.05), due to higher foliar mass in this aspect. Nitrate uptake exceeded ammonium uptake by 63 % (P&lt;0.05). The mineralization of soil nitrogen, in relation to altitude and aspects, did not schow a defined trend. P. hartwegii adapts to seasonal conditions for the acquisition of both forms of nitrogen, allowing it to colonize adverse high-mountain sites. P. hartwegii stands at low elevations (3 500 m) and with Southwestern exposure are more susceptible to alterations in the N cycle.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Absorción de Nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[bosques de alta montaña]]></kwd>
<kwd lng="es"><![CDATA[formas de Nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[mineralización de Nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[topografía]]></kwd>
<kwd lng="es"><![CDATA[uso de 15N]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen absorption]]></kwd>
<kwd lng="en"><![CDATA[high mountain forests]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen forms]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen mineralization]]></kwd>
<kwd lng="en"><![CDATA[topography]]></kwd>
<kwd lng="en"><![CDATA[use of 15N]]></kwd>
</kwd-group>
</article-meta>
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