<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322017000400123</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respiración del suelo en cuatro sistemas de uso de la tierra]]></article-title>
<article-title xml:lang="en"><![CDATA[Soil respiration in four land use systems]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yáñez Díaz]]></surname>
<given-names><![CDATA[María Inés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cantú Silva]]></surname>
<given-names><![CDATA[Israel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Rodríguez]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marmolejo Monsiváis]]></surname>
<given-names><![CDATA[José G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jurado]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Meza]]></surname>
<given-names><![CDATA[Marco V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Economía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>42</numero>
<fpage>123</fpage>
<lpage>149</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322017000400123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322017000400123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322017000400123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La respiración del suelo (Rs) o emisión del dióxido de carbono (CO2) es considerada como el segundo flujo de carbono más importante, por su magnitud en los ecosistemas terrestres. El cambio de uso de suelo ha modificado el ciclo global del carbono, lo que puede agudizar el calentamiento global. El objetivo del estudio fue evaluar las variaciones diurnas y estacionales en el flujo de CO2 en Vertisoles bajo cuatro sistemas de uso de suelo en el noreste de México; matorral, pastizal, agrícola y plantación de Eucalyptus spp. Se realizaron mediciones semanales durante un año, en muestreos de mañana y tarde, con un analizador portátil EGM-4; además, y se midieron la temperatura del suelo y su humedad. La Rs por la mañana fue de 3.21 µmol CO2 m-2 s-1 (agrícola), 3.86 µmol CO2 m-2 s-1 (plantación), 4.61 µmol CO2 m-2 s-1 (pastizal) y 6.17 µmol CO2 m-2 s-1 (matorral), los valores se incrementaron con la misma tendencia para la Rs de la tarde. Se determinaron diferencias significativas (P&#8804;0.05) en los usos de suelo y hora de muestreo. La temperatura osciló de 12 °C a 35.4 °C y la humedad del suelo en valores de 6.9 % a 47 %. En Vertisoles, las emisiones de CO2 varían según su uso, los más altos se presentan en la tarde y correlacionado con la humedad. Los sistemas de matorral y pastizal presentaron los valores más altos en la Rs, los cuales son más comunes en el noreste de México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Soil respiration (Sr), or carbon dioxide (CO2) emission, is considered to be the second most important factor in the flux of carbon. Land use change has altered the global carbon cycle; this can aggravate global warming. The objective was to evaluate CO2 efflux variation on a daily and a seasonal basis in Vertisol under four land use systems -thornscrub, grassland, agricultural and Eucalyptus spp. plantation-, through weekly measurements in morning and afternoon samplings during one year, using a portable EGM-4 analyzer; the soil temperature and soil moisture were also measured. The Sr for morning was 3.21 µmol CO2 m-2 s-1 (agricultural), 3.86 µmol CO2 m-2 s-1 (plantation), 4.61 µmol CO2 m-2 s-1 (grassland) and 6.17 µmol CO2 m-2 s-1 (thornscrub); the values of the afternoon Sr increased for all land use systems. Significant differences (P&#8804;0.05) in land use and sampling time were determined. The soil temperature ranged between 12 °C and 35.4 °C, and the soil moisture, between 6.9 % and 47 %. In Vertisols, CO2 efflux varies according their use, being higher in afternoon and in correlation with the moisture. Scrubs and grassland systems, which are more common in the northeast Mexico, showed the highest values for Sr.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Calentamiento global]]></kwd>
<kwd lng="es"><![CDATA[flujo de CO2]]></kwd>
<kwd lng="es"><![CDATA[Matorral Espinoso Tamaulipeco]]></kwd>
<kwd lng="es"><![CDATA[respiración de suelo]]></kwd>
<kwd lng="es"><![CDATA[sistemas de uso de suelo]]></kwd>
<kwd lng="es"><![CDATA[Vertisol]]></kwd>
<kwd lng="en"><![CDATA[Global warming]]></kwd>
<kwd lng="en"><![CDATA[CO2 efflux]]></kwd>
<kwd lng="en"><![CDATA[Tamaulipas thornscrub]]></kwd>
<kwd lng="en"><![CDATA[soil respiration]]></kwd>
<kwd lng="en"><![CDATA[land use systems]]></kwd>
<kwd lng="en"><![CDATA[Vertisol]]></kwd>
</kwd-group>
</article-meta>
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