<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992017000300495</article-id>
<article-id pub-id-type="doi">10.20937/rica.2017.33.03.12</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[FITORREMEDIACIÓN DE UN SUELO CONTAMINADO CON PETRÓLEO EXTRA PESADO CON Megathyrsus maximus]]></article-title>
<article-title xml:lang="en"><![CDATA[PHYTOREMEDIATION OF A SOIL CONTAMINATED WITH EXTRA HEAVY PETROLEUM BY Megathyrsus maximus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Valencia]]></surname>
<given-names><![CDATA[Ismael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navas]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Infante]]></surname>
<given-names><![CDATA[Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central de Venezuela Instituto de Zoología y Ecología Tropical Centro de Ecología Aplicada]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Ciencias Escuela de Biología]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Ciencias Postgrado de Geoquímica]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>495</fpage>
<lpage>503</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992017000300495&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992017000300495&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992017000300495&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La contaminación del suelo por petróleo es un problema ambiental y la fitorremediación ha probado ser una técnica promisoria para recuperar estos suelos. No obstante, la selección de especies para ser usadas en la fitorremediación es clave para obtener resultados satisfactorios. En el presente trabajo se estudió la capacidad del pasto Megathyrsus maximus para fitorremediar un suelo contaminado con petróleo extra pesado, a través de los cambios durante 120 días en el contenido de hidrocarburos totales de petróleo y de indicadores de la actividad microbiológica en el suelo (actividad de la enzima deshidrogenasa, biomasa del carbono microbiano y respiración basal), los cuales fueron evaluados en dos tratamientos, uno en suelos contaminados en donde se trasplantó Megathyrsus maximus y otro en suelos contaminado sin la planta. Las diferencias entre tratamientos fueron pequeñas pero significativas. Los resultados mostraron que en 120 días el contenido de hidrocarburos se redujo en un 17.1 %, en el tratamiento con M. maximus y en 9.8 % en el tratamiento sin plantas. Las fracciones de los hidrocarburos que disminuyeron fueron las de aromáticos y saturados para el tratamiento con M. maximus y la de aromáticos para el tratamiento sin plantas. El tratamiento con pastos mostró cambios en el tiempo para todos los indicadores bioquímicos y microbiológicos evaluados, mientras que el tratamiento sin pastos sólo para la actividad de la enzima deshidrogenasa y el coeficiente metabólico. La actividad microbiana fue siempre mayor o similar en el tratamiento con plantas, probablemente por la presencia de una rizósfera que favorece dicha actividad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Soil contamination by petroleum is an environmental problem and phytoremediation has proved to be a promising method for treating such soils. However, selection of species for use in phytoremediation is a key factor for its successful application. The aim of this study was to investigate the phytoremediation potential of the grass Megathyrsus maximus in heavy crude-oil contaminated soils. Temporal changes on total hydrocarbons and soil microbiological activity (enzyme activity of dehydrogenase, microbial biomass carbon and basal respiration) were evaluated in two treatments of oil contaminated soil, planted and unplanted with M maximus, over a 120-day period. Differences between both treatments were small but significant. Hydrocarbon concentration was reduced 17.1 % in planted soils and 9.8 % in unplanted treatments. Both saturated and aromatic hydrocarbon fractions were reduced in planted treatments but aromatics was the only fraction reduced in unplanted treatment. Biochemical and microbiological indicators varied temporally in the planted treatment but the unplanted treatment only showed differences for dehydrogenase enzyme activity and the metabolic coefficient. Microbial activity was always higher or similar in the planted treatment compared to the unplanted one, probably as a result of the rhizosphere favoring this activity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[biorremediación]]></kwd>
<kwd lng="es"><![CDATA[pastos]]></kwd>
<kwd lng="es"><![CDATA[actividad microbiana]]></kwd>
<kwd lng="es"><![CDATA[trópico]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[bioremediation]]></kwd>
<kwd lng="en"><![CDATA[pastures]]></kwd>
<kwd lng="en"><![CDATA[microbial activity]]></kwd>
<kwd lng="en"><![CDATA[tropic]]></kwd>
</kwd-group>
</article-meta>
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