<?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>S0187-57792015000400263</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Morfología y geoquímica de suelos de Xochimilco]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphology and geochemistry of Xochimilco soils]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara Olivar]]></surname>
<given-names><![CDATA[Brenda Karina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega Escobar]]></surname>
<given-names><![CDATA[Héctor Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos Gómez]]></surname>
<given-names><![CDATA[Ramiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solano]]></surname>
<given-names><![CDATA[Eloy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vanegas Rico]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Estado]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Fac. de Estudios Superiores Zaragoza Unidad de Investigación en Sistemática Vegetal y Suelo]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>33</volume>
<numero>4</numero>
<fpage>263</fpage>
<lpage>273</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792015000400263&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792015000400263&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792015000400263&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La zona chinampera de Xochimilco pertenece al área natural protegida ejidos de Xochimilco y San Gregorio Atlapulco por decreto de la UNESCO. En esta zona se desarrolla la agricultura, la cual es afectada por los altos índices de salinidad, lo que reduce la productividad de las chinampas y propicia su abandono y deterioro ecológico. Para contribuir a su recuperación y conservación, se evaluaron las características físico-químicas de los suelos con relación a la naturaleza del material parental y magnitud de acumulación, obteniendo un perfil de suelo a una profundidad de 300 cm, y con evaluaciones cada 10 cm. Los resultados indicaron la presencia de un acuñamiento a 110 cm de profundidad, el cual corresponde a una capa de ceniza semicompacta e hidrófoba, la cual actúa como una fase semiaislante durante la lixiviación y eluviación de sales. El dinamismo de las propiedades físico-químicas esta alterado por tal acuñamiento dado que, interfiere la lixiviación de sales y lleva a aumentar su concentración en los horizontes superiores como parte del ascenso capilar y desecación, así mismo, la combinación de las propiedades físicas del suelo y el material parental, provocan la disminución de la conductividad hidráulica y el aumento de la concentración salina en el perfil.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The chinampa area of Xochimilco is part of the protected area shared by the ejidos Xochimilco and San Gregorio Atlapulco by decree of UNESCO. Agriculture is carried out in this area. However, high levels of salinity reduce chinampa productivity and encourage neglect and ecological deterioration. To contribute to recovery and maintenance of the area, the physical-chemical characteristics of the soil were assessed, relative to the nature and magnitude of accumulation of the parent material. A soil profile to the depth of 300 cm was obtained, and characteristics were evaluated every 10 cm. Results indicated the presence of wedging at 110 cm, corresponding to a layer of semi-compact and hydrophobic ash. This ash is a semi-insulating phase during leaching and salt eluviation. The dynamism of the physical-chemical properties is altered by wedging since it interferes in salt leaching and leads to increased salt concentrations in the upper horizons because of capillary rise and drying. Moreover, the combination of physical properties of the soil and the parent material causes a decrease in hydraulic conductivity and increases salt concentration in the profile.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[lixiviación de sales]]></kwd>
<kwd lng="es"><![CDATA[sodicidad]]></kwd>
<kwd lng="es"><![CDATA[pleistoceno]]></kwd>
<kwd lng="es"><![CDATA[sierra Chichinautzin]]></kwd>
<kwd lng="es"><![CDATA[periodo glacial]]></kwd>
<kwd lng="en"><![CDATA[salt leaching]]></kwd>
<kwd lng="en"><![CDATA[sodicity]]></kwd>
<kwd lng="en"><![CDATA[pleistocene]]></kwd>
<kwd lng="en"><![CDATA[sierra Chichinautzin]]></kwd>
<kwd lng="en"><![CDATA[glacial period]]></kwd>
</kwd-group>
</article-meta>
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