<?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>S0187-57792016000300311</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Carbon saturation in the silt and clay particles in soils with contrasting mineralogy]]></article-title>
<article-title xml:lang="es"><![CDATA[Saturación del carbono en las partículas de limo y arcilla en suelos con mineralogía contrastante]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Matus]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garrido]]></surname>
<given-names><![CDATA[Estrella]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etchevers]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Merino]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Báez]]></surname>
<given-names><![CDATA[Aurelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Frontera  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de La Frontera Depto. de Ciencias Químicas y Recursos Naturales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Católica del Maule Escuela de Agronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>34</volume>
<numero>3</numero>
<fpage>311</fpage>
<lpage>319</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792016000300311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792016000300311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792016000300311&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The silt and clay particles play a key role as stabilizing agents of soil organic carbon (SOC). Several lines of evidence indicate a theoretical maximum or C saturation in individual particles. In the present study, we hypothesized that a C fraction displaying linear accumulation relative to the SOC is not influenced by C saturation, while a fraction displaying an asymptotic relationship is regarded as saturated (Stewart et al., 2008). The aim of the present study was to compare the amount of C in the silt and clay sized fractions in temperate and subtropical cropping soils across a range of textures with different mineralogy. Twenty-one and 18 soil samples containing 1:1 and 2:1 clay of temperate soil from Chile under monoculture of maize (Zea maiz L.) for at least 30 years and 9 subtropical soils from Mexico under maize and bean (Phaseolus vulgaris L.) cropping for 9 years having mixed clay were collected at 0-0.1 m. The SOC of 2:1 soils was significantly higher (14±0.5 g kg-1 dry soil) than 1:1 soils (10±0.7 g kg-1). However, subtropical soils showed the highest values (59±0.5 g kg-1). A positive (P &lt; 0.01) relationship was observed between the SOC and the C in the silt fraction (R2 0.80-0.97, P &lt; 0.01). In contrast, the clay fraction remained constant or showed asymptotic behavior. We conclude that the silt fraction, unlike clay, showed no evidence of C saturation, while clay accumulates C to a maximum. On average, the 2:1 clay was saturated at 1-2 g C kg-1 and 1:1 at 1 g C kg-1, and subtropical soils at 14 g C kg-1.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El limo y la arcilla juegan un papel clave en la estabilización del carbono orgánico del suelo (SOC) y son fracciones susceptibles de saturarse de C. En este trabajo se postula que si un reservorio de carbono (C) muestra una acumulación lineal del contenido de SOC, la fracción no está saturada con C, mientras que una fracción que muestre un plató o una relación asintótica se considera saturada (Stewart et al., 2008). Se comparó el C en las fracciones del tamaño del limo y arcilla en suelos templados y subtropicales de cultivo que presentan un intervalo contrastante de texturas con diferentes mineralogías. Se muestrearon de 0-0.1 m, 21 muestras con arcillas del tipo 1:1 y 18 con arcillas del tipo 2:1 de suelos templados de Chile bajo monocultivo de maíz (Zea maiz L.) por al menos 30 años y, 9 suelos subtropicales de México bajo rotación de maíz y frijol (Phaseolus vulgaris L.) por 9 años con arcillas mixtas. En promedio, el C en suelos con arcillas 2:1 fue significativamente superior (14±0.5 g kg-1) a los suelos con arcillas 1:1 (10±0.7 g kg-1). Sin embargo, los suelos subtropicales mostraron el valor más alto (59.0±0.5). Hubo una relación positiva entre el SOC y el C en la fracción de limo (R2 0.80-0.97; P &lt; 0.01). En contraste, la fracción arcilla fue constante o mostró un comportamiento asintótico. Se concluyó que la fracción de limo, a diferencia de la arcilla, no mostró evidencia de saturación con C. La fracción de limo se considera parcialmente reactiva, mientras que la fracción de arcilla acumula C hasta un valor máximo. En promedio la arcilla se saturó con 1-2 g C kg-1 para suelos 2:1, con 1 g C kg-1 para suelos 1:1 y los suelos subtropicales se saturaron con 14 g C kg-1.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[particle-size fractionation]]></kwd>
<kwd lng="en"><![CDATA[ultrasonic dispersion]]></kwd>
<kwd lng="en"><![CDATA[soil organic matter]]></kwd>
<kwd lng="es"><![CDATA[fraccionamiento físico de partículas]]></kwd>
<kwd lng="es"><![CDATA[dispersión por ultrasonido]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica del suelo]]></kwd>
</kwd-group>
</article-meta>
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