<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122017000100095</article-id>
<article-id pub-id-type="doi">10.15446/acag.v66n1.53171</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Estimation of soil organic carbon (SOC) at different soil depths and soil use in the Sumapaz paramo, Cundinamarca - Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Estimación de carbón orgánico del suelo (COS) a diferentes profundidades y uso del suelo en el páramo de Sumapaz, Cundinamarca- Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montes-Pulido]]></surname>
<given-names><![CDATA[Carmen Rosa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Miras]]></surname>
<given-names><![CDATA[José Joaquín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[San José -Wery]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Abierta y a Distancia UNAD Escuela de Ciencias Agrícolas, Pecuarias y del Medio Ambiente ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Católica Santa Teresa de Jesús de Ávila  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Católica de Avila  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>66</volume>
<numero>1</numero>
<fpage>95</fpage>
<lpage>101</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122017000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122017000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122017000100095&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The vertical distribution of soil organic carbon (SOC), considered to be a key component of the carbon cycle, is still poorly understood in tropical highest mountain ecosystems such as the Andean paramo. The estimation of the SOC in the presence and absence of anthropic intervention, will help to define policies to mitigate CO2 emissions into the atmosphere from this ecosystem. The aim of this research was to determine soil organic carbon sequestration at three soil depths under two types of soil use in the paramo of Sumapaz, Colombia. The soil variations of pH, phosphorus, aluminum, bulk density, carbon sequestration, cation exchange capacity, texture and to estimate the vertical distribution of soil organic carbon SOC, were evaluated, respectively. Two sites were selected to establish the soil estimations according to soil use: natural vegetation cover and potato (Solanum tuberosum L.) crop. Samples were taken from 0-25, 25-50 and &gt; 50 cm soil depths. Consequently, eight physical-chemical variables were analyzed in terms of the SOC sequestration estimated for each soil depth and soil. The averages for SOC under natural vegetation cover were: 188 tC.ha-1 to 25 cm, 183 tC.ha-1 to 50 cm, and 178 tC.ha-1 at soil depths below 50cm. For potato (Solanum tuberosum L.) crops, SOC sequestration were: 119 tC.ha-1 to 25 cm, 83 tC.ha-1 to 50 cm, and 71.8 tC.ha-1 at soil depths below 50cm. These results allow to support the soil management strategies that addressed to preserve SOC and regulate water level within the ecosystem of the Andean paramo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La distribución vertical de carbono orgánico del suelo (COS), que se considera un componente clave del ciclo del carbono, aún es poco conocido en los ecosistemas tropicales más altos de montaña, como lo es el páramo andino. La estimación del COS en presencia y ausencia de la intervención antrópica, ayudará a definir las políticas para mitigar las emisiones de CO2 a la atmósfera a partir de este ecosistema. El objetivo de esta investigación fue determinar el secuestro del carbono orgánico del suelo a tres profundidades bajo dos tipos de uso del suelo en el páramo de Sumapaz, Colombia. Las variaciones del suelo de pH, fósforo, aluminio, densidad aparente, la captura de carbono, la capacidad de intercambio catiónico, la textura y para estimar la distribución vertical del COS carbono orgánico del suelo, se evaluaron, respectivamente. Se seleccionaron dos sitios para establecer las estimaciones del suelo de acuerdo con el uso del suelo: la cubertura vegetal natural y el cultivo de la papa (Solanum tuberosum L.). Se tomaron muestras a diferentes profundidades: 0-25, 25-50 y &gt; 50 cm del suelo. En consecuencia, ocho variables físico-químicas se analizaron en términos de la captura de COS estimado para cada profundidad del suelo y el uso del suelo. Los promedios del COS bajo la cubertura vegetal natural fueron: 188 tC.ha-1 a 25 cm, 183 tC.ha-1 a 50 cm, y 178 tC.ha-1 a profundidades del suelo inferiores a 50 cm. Para los cultivos de papa (Solanum tuberosum L.), el secuestro del COS fue: 119 tC.ha-1 a 25 cm, 83 tC.ha-1 a 50 cm, y 71.8 tC.ha-1 a profundidades del suelo inferiores a 50 cm. Estos resultados permiten apoyar las estrategias de manejo del suelo direccionados a preservar el COS y regular el nivel de agua dentro del ecosistema de páramo andino.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Andisols]]></kwd>
<kwd lng="en"><![CDATA[root carbon]]></kwd>
<kwd lng="en"><![CDATA[soil organic matter]]></kwd>
<kwd lng="en"><![CDATA[vertical distribution]]></kwd>
<kwd lng="es"><![CDATA[Andisoles]]></kwd>
<kwd lng="es"><![CDATA[carbono de raíces]]></kwd>
<kwd lng="es"><![CDATA[distribución vertical]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica del suelo]]></kwd>
<kwd lng="es"><![CDATA[páramo]]></kwd>
</kwd-group>
</article-meta>
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<surname><![CDATA[Torres-González]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cuero-Guependo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Peña-Óspina]]></surname>
<given-names><![CDATA[J.A]]></given-names>
</name>
</person-group>
<source><![CDATA[Agron Colomb]]></source>
<year>2013</year>
<volume>31</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>112-9</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
