<?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>S2007-40182018000100115</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2017.09.055</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reservoirs and nutrient dynamics in two stands of Pinus montezumae Lamb. in Tlaxcala, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Reservorios y dinámica de nutrientes en dos rodales bajo aprovechamiento de Pinus montezumae Lamb. en Tlaxcala, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Escobar]]></surname>
<given-names><![CDATA[Norma F.]]></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"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez-Martínez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fierros-González]]></surname>
<given-names><![CDATA[Aurelio M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castruita-Esparza]]></surname>
<given-names><![CDATA[Luis U.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Castillo]]></surname>
<given-names><![CDATA[José A. G.]]></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[,Universidad Autónoma de Chihuahua Campus Delicias Facultad de Ciencias Agrícolas y Forestales]]></institution>
<addr-line><![CDATA[Cd. Delicias Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></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>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>115</fpage>
<lpage>129</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182018000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182018000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182018000100115&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Nutrient cycle studies are important to propose sustainable methods in forestry.  Objectives:  To evaluate the reservoirs of N, P, K, Ca and Mg in trees, litter and mineral soil of two managed stands of Pinus montezumae Lamb.; estimate the decomposition rate of litter; and quantify the annual amount of nutrients required for tree growth.  Materials and methods:  The study was conducted in Nanacamilpa, Tlaxcala. The biomass and mass of nutrients in trunk, branches and leaves were estimated with a destructive sampling of 10 trees.  Results and discussion:  Dasometric data, reservoirs and nutrient dynamics were similar in both stands (t, P &gt; 0.05). In mineral soil, the contents of N, P, K, Ca and Mg were 5 419, 68, 1 245, 9 163 and 2 029 kg·ha-1, respectively; and in aerial biomass were 242, 12, 28, 167 and 118 kg·ha-1, respectively. The decomposition rate of leaf-litter was -0.335. Trees require 73 to 81 kg·ha-1·year-1 of N, 5.2 to 5.3 kg·ha-1·year-1 of P and 9.4 to 10 kg·ha-1·year-1 of K to grow.  Conclusion:  Soil nutrients could maintain forest growth for 256 years, but P could be a limiting factor if sustainable harvest practices change.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El estudio del ciclo de nutrientes es importante para proponer métodos de aprovechamiento sostenible en los bosques.  Objetivos:  Evaluar los reservorios de N, P, K, Ca y Mg en árboles, mantillo y suelo mineral de dos rodales de Pinus montezumae Lamb. bajo aprovechamiento; estimar la tasa de descomposición de mantillo; y cuantificar la cantidad anual de nutrientes demandada.  Materiales y métodos:  El estudio se realizó en Nanacamilpa, Tlaxcala. La biomasa y masa de nutrientes en el fuste, ramas y hojas se estimaron con un muestreo destructivo de 10 árboles.  Resultados y discusión:  Los datos dasométricos, reservorios y dinámica de nutrientes fueron similares en ambos rodales (t, P &gt; 0.05). En el suelo mineral, los contenidos de N, P, K, Ca y Mg fueron 5 419, 68, 1 245, 9 163 y 2 029 kg·ha-1, respectivamente; y en la biomasa aérea fueron 242, 12, 28, 167 y 118 kg·ha-1, respectivamente. La tasa de descomposición de hojarasca fue -0.335. El arbolado requiere, para su crecimiento, 73 a 81 kg·ha-1·año-1 de N, 5.2 a 5.3 kg·ha-1·año-1 de P y 9.4 a 10 kg·ha-1·año-1 de K.  Conclusión:  Los nutrientes del suelo podrían mantener el crecimiento del bosque por 256 años, pero el P podría ser un limitante si las prácticas sustentables de cosecha se modifican.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Nutrient cycle]]></kwd>
<kwd lng="en"><![CDATA[forest harvesting]]></kwd>
<kwd lng="en"><![CDATA[forest management]]></kwd>
<kwd lng="en"><![CDATA[pine forests]]></kwd>
<kwd lng="es"><![CDATA[Ciclo de nutrientes]]></kwd>
<kwd lng="es"><![CDATA[cosecha forestal]]></kwd>
<kwd lng="es"><![CDATA[manejo forestal]]></kwd>
<kwd lng="es"><![CDATA[bosques de pino]]></kwd>
</kwd-group>
</article-meta>
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