<?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>0871-018X</journal-id>
<journal-title><![CDATA[Revista de Ciências Agrárias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. de Ciências Agrárias]]></abbrev-journal-title>
<issn>0871-018X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade de Ciências Agrárias de Portugal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0871-018X2022000300831</article-id>
<article-id pub-id-type="doi">10.19084/rca.28639</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Marcadores moleculares subrogados a la repelencia al agua en suelos afectados por el fuego]]></article-title>
<article-title xml:lang="en"><![CDATA[Molecular markers surrogated to water repellency in fire-affected soils]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Morillo]]></surname>
<given-names><![CDATA[Nicasio T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almendros]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guiomar]]></surname>
<given-names><![CDATA[Nuno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[Ana Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrocas-Dias]]></surname>
<given-names><![CDATA[Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosa]]></surname>
<given-names><![CDATA[José M. de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hatcher]]></surname>
<given-names><![CDATA[Patrick G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Pérez]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Évora Instituto Mediterrâneo para a Agricultura, Ambiente e Desenvolvimento ]]></institution>
<addr-line><![CDATA[Évora ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Museo Nacional de Ciencias Naturales  ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Recursos Naturales y Agrobiología de Sevilla  ]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Évora Laboratório Hercules ]]></institution>
<addr-line><![CDATA[Évora ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Old Dominion University Department of Chemistry and Biochemistry ]]></institution>
<addr-line><![CDATA[Norfolk VA]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>4</numero>
<fpage>831</fpage>
<lpage>840</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2022000300831&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2022000300831&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2022000300831&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La repelencia al agua del suelo (RAS) se atribuye a la acumulación de compuestos hidrofóbicos (lípidos), pero su extracción no siempre elimina la RAS, lo que sugiere que componentes macromoleculares no extraíbles también pueden estar relacionados con una RAS. Se han estudiado suelos quemados (B) y control (UB) del Parque Nacional de Doñana (Huelva, España) bajo dos tipos de vegetación (alcornoque y brezo) y fracciones de suelo: gruesa (1-2 mm) y fina (&lt;0.05 mm). La composición molecular de la materia orgánica del suelo (MOS) se analizó mediante espectrometría de masas de ultra-alta resolución. Además, se empleó la regresión por mínimos cuadrados parciales (PLS) para explorar la relación entre la RAS y la MOS definida por la abundancia de los 1221 compuestos orgánicos comunes. También se utilizaron índices para obtener gráficas que faciliten la identificación de biomarcadores de la RAS. En los suelos quemados, la RAS estaba significativamente relacionada (P&lt;0.05) con compuestos aromáticos y condensados, mientras que, en los suelos control, la MOS incluía compuestos aromáticos y ligninas. En las fracciones finas, la RAS estuvo relacionada principalmente con lípidos, pero, no se encontró correlación en las fracciones gruesas. Los resultados permiten concluir que la hidrofobicidad depende de varias famílias de compuestos orgánicos. La combinación de la FT-ICR/MS con herramientas estadísticas ha facilitado la obtención de nuevos biomarcadores de RAS.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Soil water repellency (SWR) is often attributed to the accumulation of hydrophobic organic compounds, mainly lipids. Nonetheless, lipid extraction not always suppress SWR and unextractable soil constituents may be related with residual SWR. Burnt (B) and unburnt (UB) soils (Doñana National Park, Huelva) under two vegetations (cork oak and heather) and two soil fractions, coarse (1-2 mm) and fine (&lt;0.05 mm) were studied. Soil organic matter (SOM) molecular composition was studied by ultra-high resolution mass spectrometry. Partial least squares regression (PLS) was employed to explore SWR in function the abundance of the 1221 common compounds found. An omic approach using various indices (e.g., factor loadings of PLS models, etc,) was applied to identify compounds which could be used as proxies for SWR. In the case of B soils, SWR was related (P&lt; 0.05) to aromatic and condensed compounds, while in UB soils it relied mainly on aromatics and lignins. In the fine fractions, lipids were associated with SWR, and no correlation was found in the coarse fractions. In conclusion, hydrophobicity was related to lipids as expected, but also to lignin and aromatic components. The combination of FT-ICR/MS with graphical statistical approach was effective in finding molecular predictors of SWR.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hidrofobicidad]]></kwd>
<kwd lng="es"><![CDATA[incendios forestales]]></kwd>
<kwd lng="es"><![CDATA[espectrometría de masas]]></kwd>
<kwd lng="es"><![CDATA[quimiometría]]></kwd>
<kwd lng="es"><![CDATA[diagrama de van Krevelen]]></kwd>
<kwd lng="en"><![CDATA[Chemometrics]]></kwd>
<kwd lng="en"><![CDATA[forest fires]]></kwd>
<kwd lng="en"><![CDATA[hydrophobicity]]></kwd>
<kwd lng="en"><![CDATA[mass spectrometry]]></kwd>
<kwd lng="en"><![CDATA[van Krevelen diagram]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[De Blas]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez-Alleres]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Almendros]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Speciation of lipid and humic fractions in soils under pine and eucalyptus forest in northwest Spain and its effect on water repellency]]></article-title>
<source><![CDATA[Geoderma]]></source>
<year>2010</year>
<volume>155</volume>
<numero>3-4</numero>
<issue>3-4</issue>
<page-range>242-8</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Deus]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[A.Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez-Morillo]]></surname>
<given-names><![CDATA[N.T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Molecular Characterization of Burned Organic Matter at Different Soil Depths and Its Relationship with Soil Water Repellency: A Preliminary Result]]></article-title>
<source><![CDATA[Agronomy]]></source>
<year>2021</year>
<volume>11</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>2560</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jiménez-Morillo]]></surname>
<given-names><![CDATA[N.T.]]></given-names>
</name>
<name>
<surname><![CDATA[Almendros]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[A.Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Hatcher]]></surname>
<given-names><![CDATA[P.G.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Pérez]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hydrophobicity of soils affected by fires: An assessment using molecular markers from ultra-high resolution mass spectrometry]]></article-title>
<source><![CDATA[Science of the Total Environment]]></source>
<year>2022</year>
<volume>. 817</volume>
<page-range>152957</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jiménez-Morillo]]></surname>
<given-names><![CDATA[N.T.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Pérez]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Almendros]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[de la Rosa]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Waggoner]]></surname>
<given-names><![CDATA[D.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Jordán]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Zavala]]></surname>
<given-names><![CDATA[L.M.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Vila]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hatcher]]></surname>
<given-names><![CDATA[P.G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ultra-high resolution mass spectrometry of physical speciation patterns of organic matter in fire-affected soils]]></article-title>
<source><![CDATA[Journal of Environmental Management]]></source>
<year>2018</year>
<volume>225</volume>
<page-range>139-47</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jiménez-Morillo]]></surname>
<given-names><![CDATA[N.T.]]></given-names>
</name>
<name>
<surname><![CDATA[Spangenberg]]></surname>
<given-names><![CDATA[J.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[A.Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Jordán]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Zavala]]></surname>
<given-names><![CDATA[L.M.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Vila]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Pérez]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Wildfire effects on lipid composition and hydrophobicity of bulk soil and soil size fractions under Quercus suber cover (SW-Spain)]]></article-title>
<source><![CDATA[Environmental Research]]></source>
<year>2017</year>
<volume>159</volume>
<page-range>394-405</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
