<?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>2215-3896</journal-id>
<journal-title><![CDATA[Revista de Ciencias Ambientales]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencias Ambientales]]></abbrev-journal-title>
<issn>2215-3896</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-38962022000100028</article-id>
<article-id pub-id-type="doi">10.15359/rca.56/1.2</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelos no lineales mixtos para la construcción de curvas de índice de sitio para Tectona grandis Linn. en la Vertiente del Pacífico de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Mixed non-linear models to develop site index curves for Tectona grandis Linn. in the Pacific Coast of Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Chacón]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jerez-Rico]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza-Picado]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chinchilla-Mora]]></surname>
<given-names><![CDATA[Orlando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaves-Salas]]></surname>
<given-names><![CDATA[Eladio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional (UNA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Los Andes (ULA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional (UNA) Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional (UNA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>28</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-38962022000100028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-38962022000100028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-38962022000100028&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  (Introducción):  Se presenta un nuevo sistema de clasificación de sitios para Tectona grandis L.F. basado en información recolectada durante más de 30 años de investigación, con el fin de contribuir al manejo silvicultural de una de las especies más importantes en Costa Rica.  (Objetivo):  Construir curvas actualizadas de índice de sitio para plantaciones de teca.  (Metodología):  Los datos provienen del análisis fustal de 55 de árboles dominantes con edades entre 6 y 40 años, a la edad de corte, seleccionados en diferentes localidades de la Vertiente del Pacífico. Estos fueron combinados con mediciones de altura dominante provenientes de 38 parcelas permanentes medidas entre los 10 y 32 años que eran parte de 6 ensayos formales de crecimiento y rendimiento. Se definieron modelos de crecimiento, ajustados por regresión no lineal de efectos mixtos, considerando que se trata de mediciones repetidas anualmente. Se trabajó con seis modelos matemáticos: Richards, Gompertz, Logístico, Korf, Mitscherlich y Weibull. Previo al ajuste, los modelos fueron reparametrizados en función de la altura dominante observada (S), a la edad base de 16 años, asociándola a un efecto aleatorio. El mejor modelo se escogió de acuerdo con criterios de información y estadísticos de bondad de ajuste.  (Resultados):  Los criterios de información de Akaike y Bayesiano indican que el modelo de Korf fue superior a los demás, tanto en su variante anamórfica como polimórfica; los estadísticos bondad de ajuste confirmaron esta apreciación. El análisis de los residuos mostró un mejor ajuste para este modelo al proyectar el crecimiento en altura dominante con la edad. Aunque el modelo polimórfico fue superior, la tendencia observada parece descartar la existencia de una asíntota común para las plantaciones de teca creciendo en las diferentes calidades de sitio.  (Conclusiones): Los resultados mostraron que los datos de análisis fustal y de parcelas permanentes presentan patrones similares, los cuales son representados adecuadamente por el modelo de Korf.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  (Introduction):  A new site classification system for Tectona grandis L.F. is presented based on information collected during more than 30 years of research.  (Objective):  To construct an updated family of site index curves for teak plantations for the pacific coast of Costa Rica.  (Methodology):  The data came from the stem analysis of 55 dominant trees with ages between 6 and 40 years, selected in different locations of the Pacific slope. These were combined with dominant height data from 38 permanent plots that were part of 6 formal growth and yield trials remeasured between 10 and 32 years old. Growth models were fitted by mixed effects nonlinear regression, considering that trees and plots were remeasured annually. Six mathematical models were used: Richards, Gompertz, Logistic, Korf, Mitscherlich and Weibull. The models were re-parameterized according to the observed dominant height (S) at the base age of 16 years, associating it with a random effect. The best model was chosen according to the information criteria and goodness-of-fit statistics.  (Results):  The Akaike and Bayesian information criteria indicate that Korf's model was superior to the others, both in the anamorphic and polymorphic variant; the goodness-of-fit statistics confirmed this appreciation. The residual analysis showed a better fit for this model when describing growth in dominant height with age. Although the polymorphic model was superior, the observed trends seem to rule out the existence of a common asymptote for teak plantations growing in the different site qualities.  (Conclusions):  The results showed that the data from stem analysis and permanent plots show similar pattern trends, which are adequately represented by the Korf's model.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Análisis fustal]]></kwd>
<kwd lng="es"><![CDATA[calidad de sitio]]></kwd>
<kwd lng="es"><![CDATA[curvas polimórficas]]></kwd>
<kwd lng="es"><![CDATA[efectos aleatorios]]></kwd>
<kwd lng="es"><![CDATA[efectos mixtos]]></kwd>
<kwd lng="es"><![CDATA[parcelas permanentes]]></kwd>
<kwd lng="es"><![CDATA[teca]]></kwd>
<kwd lng="en"><![CDATA[Mixed effects]]></kwd>
<kwd lng="en"><![CDATA[permanent plots]]></kwd>
<kwd lng="en"><![CDATA[polymorphic curves]]></kwd>
<kwd lng="en"><![CDATA[random effects stem analysis]]></kwd>
<kwd lng="en"><![CDATA[site quality]]></kwd>
<kwd lng="en"><![CDATA[teak]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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