<?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>S0187-57792016000100039</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Almacenes y flujos de carbono en ecosistemas áridos y semiáridos de México: Síntesis y perspectivas]]></article-title>
<article-title xml:lang="en"><![CDATA[Carbon stocks and fluxes in arid and semiarid ecosystems of Mexico: Synthesis and prospects]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montaño]]></surname>
<given-names><![CDATA[Noé Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bullock]]></surname>
<given-names><![CDATA[Stephen H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Briones]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Oliva]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Sánchez]]></surname>
<given-names><![CDATA[Rosalva]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maya]]></surname>
<given-names><![CDATA[Yolanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perroni]]></surname>
<given-names><![CDATA[Yareni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Siebe]]></surname>
<given-names><![CDATA[Christina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia Torres]]></surname>
<given-names><![CDATA[Yunuen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A0"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Troyo]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yépez]]></surname>
<given-names><![CDATA[Enrico]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa División de Ciencias Biológicas y de la Salud]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigaciones Biológicas del Noroeste S.C.  ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada Departamento de Biología de la Conservación ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Ecología A.C.  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional Autónoma de México campus Morelia Instituto de Investigaciones en Ecosistemas y Sustentabilidad]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Zaragoza Unidad de Investigación en Ecología Vegetal]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidad, Veracruzana Instituto de Biotecnología y Ecología Aplicada ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Edafología]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados ]]></institution>
<addr-line><![CDATA[Irapuato Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Universidad Nacional Autónoma de México campus Morelia Instituto de Geofísica]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A11">
<institution><![CDATA[,Instituto Tecnológico de Sonora Departamento de Ciencias del Agua y Medio Ambiente ]]></institution>
<addr-line><![CDATA[Ciudad Obregón Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>34</volume>
<numero>1</numero>
<fpage>39</fpage>
<lpage>59</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792016000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792016000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792016000100039&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los ecosistemas áridos y semiáridos constituyen un tercio de la superficie terrestre global y un 60% del territorio mexicano, pero poco se sabe sobre su importancia en el ciclo del carbono (C). Este trabajo sintetiza y analiza la información disponible sobre almacenes, flujos y controles de la dinámica del C en las regiones áridas y semiáridas de México. En estos ecosistemas, la productividad neta del ecosistema, la respiración del suelo, la producción y la descomposición de la hojarasca están determinadas por la variabilidad de la precipitación, aunque la descomposición depende también de la radiación solar y temperatura. El suelo es el principal almacén de C, representa 45 y 90% del C en la biomasa del matorral y pastizal, respectivamente. Las regiones semiáridas podrían almacenar más C orgánico e inorgánico que las regiones áridas. El cambio de uso de suelo disminuye hasta en 50% el C orgánico del suelo (COS), pero las especies vegetales formadoras de islas de fertilidad y de recursos amortiguan el impacto de la perturbación en el almacenamiento del C, al actuar como &#8220;hotspots&#8221; de conservación y trasformación del COS. Las biocostras también controlan la acumulación del COS, debido a su rápida respuesta a la humedad que potencia los flujos del C y la transformación de los nutrimentos en el suelo. El COS controla la estequiometría microbiana que regula la disponibilidad de otros nutrimentos en el suelo. La información sobre la dinámica del C para las regiones áridas y semiáridas de México es aún escasa y fragmentada, ya que la mayoría se limita al COS, en los primeros 30 cm del perfil, sin considerar el C inorgánico del suelo. En consecuencia, es necesario y urgente estandarizar metodologías para cuantificar los almacenes y flujos a diferentes escalas espacio-temporales en los ecosistemas áridos y semiáridos del país.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The arid and semiarid ecosystems cover one third of world continental area and around 60% in Mexico, but their role in the global C cycle regulation is poorly known. The present paper analyzes data on C stocks and fluxes, as well as control factors of C dynamics in several arid and semiarid regions of Mexico. In these ecosystems, the net ecosystem productivity, soil respiration, litter fall, and litter decomposition are strongly affected by the total rainfall and its variability. Also, litter decomposition is affected by temperature and solar radiation. The main C pool in these ecosystems is the soil, containing 45% and 90% of total ecosystem carbon for desert-scrub and grassland, respectively. The semiarid regions have higher inorganic and organic C contents than the arid regions. However, soil organic carbon (SOC) is reduced by up to 50% because of land-use change, but this reduction may be mitigated by plant species, which form fertility and/or resources islands acting as a hotspot for conservation and transformation of SOC. Additionally, the soil biocrusts play an important role in the SOC accumulation, because it responds quickly to humidity pulses and therefore nutrients are released from organic compounds. Finally, SOC availability strongly affects microbial activity, which in turn controls soil nutrient availability and nutrient stoichiometry ratios linked to soil fertility. We conclude that the information of C stocks and fluxes in semiarid and arid ecosystems of Mexico is scarce and fragmented, because the majority of the studies are focused in SOC quantification in the upper 30 cm soil layer, and soil inorganic C is often not measured. For this reason, it is urgent and necessary to standardize methods and intensify the research on soil C dynamics in these ecosystems, integrating different spatial-temporal scales.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biocostras]]></kwd>
<kwd lng="es"><![CDATA[desiertos mexicanos]]></kwd>
<kwd lng="es"><![CDATA[islas de recursos]]></kwd>
<kwd lng="es"><![CDATA[matorrales desérticos]]></kwd>
<kwd lng="es"><![CDATA[pastizales]]></kwd>
<kwd lng="en"><![CDATA[biocrusts]]></kwd>
<kwd lng="en"><![CDATA[mexican deserts]]></kwd>
<kwd lng="en"><![CDATA[fertility islands]]></kwd>
<kwd lng="en"><![CDATA[desert-scrubs]]></kwd>
<kwd lng="en"><![CDATA[grassland]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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