<?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>S0120-28122022000200119</article-id>
<article-id pub-id-type="doi">10.15446/acag.v71n2.97692</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Existencias de carbono orgánico en suelos cultivados con pasto kikuyo en el norte de Antioquia]]></article-title>
<article-title xml:lang="en"><![CDATA[Organic carbon stocks in soils cultivated with kikuyu grass in northern Antioquia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina Sierra]]></surname>
<given-names><![CDATA[Marisol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barahona Rosales]]></surname>
<given-names><![CDATA[Rolando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez Henao]]></surname>
<given-names><![CDATA[Andrés Mateo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo Tobón]]></surname>
<given-names><![CDATA[Juan Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerón Muñoz]]></surname>
<given-names><![CDATA[Mario Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia sede Medellín  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>71</volume>
<numero>2</numero>
<fpage>119</fpage>
<lpage>129</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122022000200119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122022000200119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122022000200119&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los sistemas de ganadería bovina son considerados emisores de gases efecto invernadero. Sin embargo, algunos de sus componentes como el suelo, permiten la captura de carbono. El objetivo de este trabajo fue comparar las existencias de carbono en suelos cultivados con pasto kikuyo por varios años y suelos con coberturas de bosque o de helechal bajo diferentes geoformas, en fincas del norte de Antioquia. Se empleó un diseño en bloques aleatorizados, en el cual los bloques correspondieron al tipo de cobertura de las plantas. Los tratamientos en arreglo factorial 3x5, comprendieron las geoformas y los muestreos. Se consideraron en el modelo los efectos de las geoformas (cóncavo, convexo y plano), tipo de cobertura de plantas (kikuyo, bosque y helechal) y profundidad de muestreo (0-20, 20-40, 40-60, 60-80 y 80-100 cm). Se realizaron análisis de varianza para las variables: cantidad de carbono en el suelo y raíces finas y gruesas, tallos, hojas, estolones y biomasa muerta; densidad aparente y el pH del suelo. Las existencias de carbono en los primeros 0-20 cm de profundidad fueron de 100 t ha-1 y solo 20 t ha-1 a 80-100 cm de profundidad (P&lt;0.05). Hubo diferencia en las existencias de carbono aportadas por las raíces a 0-20 y 20-40 cm de profundidad. Las distintas coberturas de plantas analizadas no afectaron la densidad aparente del suelo y su valor fue bajo para el suelo del relieve cóncavo. Contrario al efecto esperado por la siembra de pasturas en las existencias de carbono del suelo, el cambio de uso del suelo de bosque a pastura de kikuyo no presenta efectos significativos en las existencias de carbono del suelo desde la superficie de este y hasta un metro de profundidad bajo las condiciones evaluadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Cattle systems are considered greenhouse gas emitters. However, some of their components, such as soil, allow carbon sequestration. The objective of this work was to compare carbon stocks in soils cultivated with kikuyu grass for several years and soils with forest or fern cover under different geoforms, in farms in the north of Antioquia. A randomized block design was used, in which the blocks corresponded to the type of plant cover. Treatments, in a 3x5 factorial arrangement, corresponded to the geoforms and sampling. The effects of geoforms (concave, convex and flat), type of plant cover (kikuyu, forest, and fern), and sampling depth (0-20, 20-40, 40-60, 60-80 y 80-100 cm) were considered in the model. Analyses of variance were performed for the variables: amount of carbon in the soil and fine and thick roots, stems, leaves, stolons and dead biomass; and also soil bulk density and soil pH. Carbon stocks in the first 0-20 cm depth were 100 t ha-1 and only 20 t ha-1 at 80-100 cm depth (p&lt;0.05). There was a difference in carbon stocks contributed by the roots at 0-20 and 20-40 cm depth. The different plant covers analyzed did not affect soil bulk density and its value was low for the concave relief soil. Contrary to the expected effect of pasture planting on soil carbon stocks, the change of land use from forest to kikuyu pasture has no significant effect on soil carbon stocks from the soil surface to a depth of one meter under the conditions evaluated.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biomasa]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[ganado de leche]]></kwd>
<kwd lng="es"><![CDATA[gases de efecto invernadero]]></kwd>
<kwd lng="es"><![CDATA[relieve]]></kwd>
<kwd lng="en"><![CDATA[Biomass]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[dairy cattle]]></kwd>
<kwd lng="en"><![CDATA[greenhouse gases]]></kwd>
<kwd lng="en"><![CDATA[relief]]></kwd>
</kwd-group>
</article-meta>
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