<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792022000100113</article-id>
<article-id pub-id-type="doi">10.28940/terra.v40i0.968</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Soil CO2 efflux fluctuates in three different annual seasons in a semideciduous tropical forest in Yucatan, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[El flujo de CO2 del suelo fluctúa en tres temporadas del año en un bosque tropical semideciduo de Yucatán, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arellano-Martín]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dupuy]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Us-Santamaría]]></surname>
<given-names><![CDATA[Roberth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andrade]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán Unidad de Recursos Naturales ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Othón P. Blanco Quintana Roo]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792022000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792022000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792022000100113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Tropical forest soils store a third of the global terrestrial carbon and control carbon dioxide (CO2) terrestrial effluxes to the atmosphere produced by root and microbial respiration. Soil CO2 efflux varies in time and space and is known to be strongly influenced by soil temperature and water content. However, little is known about the influence of seasonality on soil CO2 efflux, especially in tropical dry forests. This study evaluated soil CO2 efflux, soil temperature, and soil volumetric water content in a semideciduous tropical forest of the Yucatan Peninsula under two sites (flat areas close to and far from hills), and three seasons: dry, wet, and early dry (a transition between the rainy and dry seasons) throughout a year. Additionally, six 24-h periods of soil CO2 efflux were measured within these three seasons. The mean annual soil CO2 efflux was 4±2.2 &#956;mol CO2 m-2 s-1, like the mean soil CO2 efflux during the early dry season. In all seasons, soil CO2 efflux increased linearly with soil moisture, which explained 45% of the spatial-temporal variation of soil CO2 efflux. Soil CO2 efflux was higher close to than far from hills in some months. The daily variation of soil CO2 efflux was less important than its spatial and seasonal variation likely due to small diel variations in temperature. Transition seasons are common in many tropical dry forests, and they should be taken into consideration to have a better understanding of the annual soil CO2 efflux, especially under future climate-change scenarios.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los suelos de los bosques tropicales almacenan un tercio del carbono terrestre global y controlan los flujos de bióxido de carbono (CO2) terrestres hacia la atmósfera, producto de la respiración de raíces y microbios. El flujo de CO2 del suelo varía en el tiempo y en el espacio y está influenciado por temperatura y contenido de humedad en el suelo. Pero poco se sabe sobre la influencia de las estaciones del año sobre el flujo de CO2 del suelo, especialmente en los bosques secos. Este estudio evaluó el flujo de CO2 del suelo, la temperatura y el contenido volumétrico de agua del suelo en un bosque tropical semideciduo de la península de Yucatán, en dos sitios planos (cerca y lejos de lomas) y tres estaciones: sequía, lluvias y sequía temprana (la transición entre lluvias y sequía) a través de un año. Adicionalmente, el flujo de CO2 del suelo fue medido en seis periodos de 24-h en las tres estaciones. El flujo de CO2 del suelo anual promedio fue de 4±2.2 &#956;mol CO2 m&#8209;2 s-1, similar al flujo promedio de CO2 del suelo durante la estación de sequía temprana. En todas las estaciones, el flujo de CO2 del suelo aumentó linealmente con la humedad del suelo, la cual explicó el 45% de la variación espaciotemporal de este flujo de CO2. El flujo de CO2 del suelo fue mayor cerca de las lomas que lejos de ellas en varios meses. La variación diaria del flujo de CO2 del suelo fue menos importante que la variación espacial y estacional, aparentemente porque las variaciones de temperatura durante el día fueron mínimas. Las estaciones de transición, comunes en muchos bosques tropicales secos, deben ser tomadas en cuenta para un mayor entendimiento de la variación anual del flujo de CO2 del suelo, especialmente bajo los escenarios futuros de cambio climático.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[early dry season]]></kwd>
<kwd lng="en"><![CDATA[soil temperature]]></kwd>
<kwd lng="en"><![CDATA[soil volumetric water content]]></kwd>
<kwd lng="en"><![CDATA[tropical dry forest]]></kwd>
<kwd lng="es"><![CDATA[bosque tropical seco]]></kwd>
<kwd lng="es"><![CDATA[contenido volumétrico de agua del suelo]]></kwd>
<kwd lng="es"><![CDATA[estación de nortes]]></kwd>
<kwd lng="es"><![CDATA[temperatura del suelo]]></kwd>
</kwd-group>
</article-meta>
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