<?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>S0871-018X2022000301041</article-id>
<article-id pub-id-type="doi">10.19084/rca.28747</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos del cambio climático en la estructura molecular de la materia orgánica del suelo de una dehesa]]></article-title>
<article-title xml:lang="en"><![CDATA[Effects of climate change in soil organic matter molecular structure in a Mediterranean savanna]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Emeterio]]></surname>
<given-names><![CDATA[Layla M. San]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Ramos]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez]]></surname>
<given-names><![CDATA[M. Teresa]]></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[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[,Instituto de Recursos Naturales y Agrobiología de Sevilla  ]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sevilla Facultad de Químicas Grupo MED Soil]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
<country>Spain</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>1041</fpage>
<lpage>1050</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2022000301041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2022000301041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2022000301041&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las sabanas mediterráneas (dehesas) son sistemas agrosilvopastoriles típicos, caracterizados por la presencia dispersa de robles (Quercus spp.) y especies arbustivas. Estos ecosistemas están sometidos a una marcada estacionalidad, propia del clima mediterráneo, lo que se refleja en la dinámica microbiana del suelo. La interacción de los factores que más afectan la dinámica microbiana (clima, vegetación y suelo), es clave para comprender los ciclos biogeoquímicos que, a su vez se espera que se reflejen en la estructura de la materia orgánica (MOS). Para evaluar el efecto del cambio climático, utilizamos pirólisis analítica (Py-GC/MS) para la caracterización molecular de la MOS en un experimento de imitación en campo (2017-2021). Entre los 117 compuestos biogénicos encontrados, las distribuciones y contenidos de ác. grasos y n-alcanos fueron más sensibles a los tratamientos climáticos. Además, se observa una degradación preferencial de compuestos derivados de holocelulosa y acumulación de compuestos derivados de la lignina, que se encuentra poco evolucionada, lo que apunta a condiciones desfavorables para la su degradación. Los resultados sugieren que la composición molecular de la MOS y la aplicación de Py-GC/MS aporta información sobre los cambios ambientales del suelo y que tienen valor como biomarcadores para el seguimiento del cambio climático en suelos mediterráneos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Mediterranean savannahs (dehesas) are typical agro-sylvo-pastoral systems, characterized by the scattered presence of oak trees (Quercus spp) and shruby species, along with the integration of other practices. These ecosystems are subjected to a marked seasonality characteristic of the Mediterranean climate, and expected to be reflected in soil microbial dynamics. The interplay of driving factors on the microbial dynamics (climate, vegetation and soil) is key to understanding biogeochemical cycles in Mediterranean forests that, in turn are expected to be reflected in soil organic matter (SOM) structure. In this communication analytical pyrolysis (Py-GC/MS) was used for the molecular characterization of SOM in a field manipulative experiment aimed to evaluate the impact of forecasted warming and drying in a five-year experiment (2017-2021). Among all the biogenic compounds that were found (a total of 117), fatty acids and aliphatic compounds (n-alkanes) were found most responsive to climatic treatments. Also, a preferential degradation of holocellulose derived compounds and accumulation and preservation of lignin derived compounds, pointing to non-favourable lignin decomposition conditions. The results suggest that SOM molecular composition, hence the application of Py-GC/MS encompasses information on soil environmental shifts having biomarker value for monitoring climate change in Mediterranean soils.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[pirólisis analítica]]></kwd>
<kwd lng="es"><![CDATA[materia oránica del suelo]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[ecosistema mediterráneo]]></kwd>
<kwd lng="en"><![CDATA[analytical pyrolysis]]></kwd>
<kwd lng="en"><![CDATA[soil organic matter]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[Mediterranean ecosystem]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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