<?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>0304-2847</journal-id>
<journal-title><![CDATA[Revista Facultad Nacional de Agronomía Medellín]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Nac. Agron. Medellín]]></abbrev-journal-title>
<issn>0304-2847</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias - Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0304-28472024000310907</article-id>
<article-id pub-id-type="doi">10.15446/rfnam.v77n3.112180</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Leaf spectrum analysis of three tropical timber species: Diomate ( Astronium graveolens), Choibá (Dipteryx oleifera), and Algarrobo (Hymenaea courbaril)]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis del espectro foliar de tres especies tropicales maderables: Diomate ( Astronium graveolens), Choibá (Dipteryx oleifera), y Algarrobo (Hymenaea courbaril)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alzate-Marin]]></surname>
<given-names><![CDATA[Estefany Johana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toro-Restrepo]]></surname>
<given-names><![CDATA[Luis Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Gómez]]></surname>
<given-names><![CDATA[July Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias Departamento de Ciencias Forestales]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</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>77</volume>
<numero>3</numero>
<fpage>10907</fpage>
<lpage>10919</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0304-28472024000310907&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0304-28472024000310907&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0304-28472024000310907&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study analyzed the leaf spectral response of three native timber forest species in the tropical dry forest: Diomate (Astronium graveolens Jacq.), Choibá (Dipteryx oleifera Benth.), and Algarrobo (Hymenaea courbaril L.). The study was conducted at the León Morales Soto Arboretum and Palmetum, at the Universidad Nacional de Colombia in Medellín, Antioquia, Colombia. Spectral data from the leaves were collected in situ using the portable spectroradiometer ASD FieldSpec HandHeld-2, which operates with a spectral resolution of 1 nm (resampled to 10 nm) and covers a spectral range between 325 and 1,075 nm (limited to 400-900 nm). Based on the measurements, the behavior and spectral variability of the species were evaluated. One-factor Analysis of Variance and Mann-Whitney-Wilcoxon U-test were implemented in reflectance spectra to select the optimal narrow bands for species discrimination. The classification capacity of the selected narrow bands was assessed using the K-nearest neighbors' algorithm. It was found that A. graveolens and H. courbaril exhibited spectral signatures typical of healthy vegetation, while D. oleifera showed spectral changes during the early stages of senescence. Regarding spectral separability, 23 narrow bands in the visible region and near-infrared region were identified as optimal for distinguishing the plant species. The supervised classification algorithm applied to these 23 narrow bands achieved an overall accuracy of 95.8%. In conclusion, these findings provide valuable insights into the spectral response of important tropical species and contribute to their conservation efforts by enhancing understanding of their unique spectral characteristics in diverse and heterogeneous ecosystems like tropical forests.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Esta investigación analizó la respuesta espectral foliar de tres especies forestales maderables nativas del bosque seco tropical, Diomate (Astronium graveolens Jacq.), Choibá (Dipteryx oleifera Benth.) y Algarrobo (Hymenaea courbaril L.). El estudio se efectuó en el Arboretum y Palmetum León Morales Soto de la Universidad Nacional de Colombia, sede Medellín, Antioquia, Colombia. Los datos espectrales de las hojas se colectaron in situ con el espectrorradiómetro portátil ASD FieldSpec HandHeld-2, que trabaja con una resolución espectral de 1 nm (remuestreada a 10 nm) y un rango espectral entre 325 y 1.075 nm (acotado entre 400 y 900 nm). A partir de las mediciones, se evaluó el comportamiento y la variabilidad espectral de las especies. Se implementó el Análisis de Varianza de un factor y la prueba U de Mann - Whitney - Wilcoxon en los espectros de reflectancia con el fin de seleccionar las bandas estrechas óptimas para discriminar las especies. Se evaluó la capacidad de clasificación de las especies en las bandas estrechas seleccionadas, utilizando el algoritmo de los K vecinos más cercanos. Encontrando que A. graveolens e H. courbaril presentaron firmas espectrales típicas de la vegetación saludable y D. oleifera evidenció cambios espectrales en el período inicial de la senescencia. Respecto a la separabilidad espectral, se encontraron 23 bandas estrechas en la región visible e infrarrojo cercano óptimas para diferenciar las especies vegetales. El algoritmo de clasificación supervisada aplicado en las 23 bandas estrechas, tuvo una precisión general del 95,8%. En conclusión, estos hallazgos proporcionan valiosos conocimientos sobre la respuesta espectral de importantes especies tropicales y contribuyen a sus esfuerzos de conservación al mejorar la comprensión de sus características espectrales únicas en ecosistemas diversos y heterogéneos como el bosque tropical.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Clasificación]]></kwd>
<kwd lng="es"><![CDATA[Hojas]]></kwd>
<kwd lng="es"><![CDATA[Separabilidad]]></kwd>
<kwd lng="es"><![CDATA[Firma espectral]]></kwd>
<kwd lng="es"><![CDATA[Espectrorradiometría]]></kwd>
<kwd lng="es"><![CDATA[Bosque tropical]]></kwd>
<kwd lng="en"><![CDATA[Classification]]></kwd>
<kwd lng="en"><![CDATA[Leaves]]></kwd>
<kwd lng="en"><![CDATA[Separability]]></kwd>
<kwd lng="en"><![CDATA[Spectral signature]]></kwd>
<kwd lng="en"><![CDATA[Spectroradiometry]]></kwd>
<kwd lng="en"><![CDATA[Tropical forest]]></kwd>
</kwd-group>
</article-meta>
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