<?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>S0187-57792021000100144</article-id>
<article-id pub-id-type="doi">10.28940/terra.v39i0.881</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Formas y distribución de fósforo en un Andisol con sistemas contrastantes de uso del suelo del centro de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Phosphorus forms and distribution in Andisol under contrasting land-use systems in central Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tinoco-Varela]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bayuelo-Jiménez]]></surname>
<given-names><![CDATA[Jeannette S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Instituto de Investigaciones Agropecuarias y Forestales ]]></institution>
<addr-line><![CDATA[Tarímbaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>39</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792021000100144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792021000100144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792021000100144&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La conversión del bosque hacia sistemas agrícolas convencionales, afecta la distribución y disponibilidad de fósforo (P), particularmente en suelos deficientes de P. El objetivo fue evaluar el efecto del uso del suelo (bosque nativo y sistema agrícola de aguacate) en las formas, distribución y disponibilidad de P. Muestras de suelo (Andisol) se incluyeron de tres sitios cultivados con manejo convencional y de áreas colindantes de bosque de pino. Las formas de P inorgánico (Pi) y orgánico (Po) del suelo y el P microbiano se extrajeron secuencialmente después de un periodo de 7 y 28 días de incubación, respectivamente. El Pi representó del 66 al 78% del P total en el suelo cultivado. El Pi lo constituyó el P de fácil mineralización (Bic-Pi), moderadamente estable (NaOH0.1-Pi) y relativamente insoluble (Residual-Pi). Sin embargo, la proporción de Po (29%) fue menor debido a la reducción de la materia orgánica. Por el contrario, en el suelo con uso forestal, más del 48% del P se extrajo en la biomasa microbiana, Bic-Po y NaOH-Po. La distribución de las formas de P se relacionó con el tipo de uso del suelo. En sistemas agrícolas convencionales aumentó la retención de P con óxidos de Fe y Al (NaOH0.1-Pi y Residual-Pi) y disminuyó el P disponible (lábil). En comparación con el suelo cultivado, la mayor proporción de Po en el suelo de bosque correspondió con el mayor contenido de materia orgánica y P microbiano. Lo anterior destaca su potencial para mantener reservorios de P en suelos ácidos con limitada disponibilidad del nutriente. La sostenibilidad de los sistemas agrícolas se puede acrecentar mediante la promoción de adecuadas prácticas de manejo que incrementen las reservas de Po y reduzcan las reacciones químicas que adsorben, ocluyen o precipitan el Pi aplicado al suelo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Conversion of forest to conventional farming systems may affect phosphorus (P) distributions and availability, particularly in P-limited soils. The objective of this study was to evaluate the effect of land use (native forest and avocado farming systems) on forms, distribution, and availability of P in soil. Soil samples (Andisol) from three sites cultivated with conventional farming and others from a contiguous native pine forest area were included. Soil Po and Pi fractions and microbial P were sequentially extracted after seven and 28-days (d) of incubation, respectively. In cultivated soil, total P was mostly represented by inorganic fractions (66 to 78%). Pi was mainly composed of easily mineralized P (Bic-Pi), moderately stable (NaOH0.1-Pi) and relatively insoluble fractions (Residual-Pi). However, Po proportion (29%) decreased under cropped soil due to depletion of soil organic matter. In contrast, in native forest soils, more than 48% of P was extracted in microbial biomass, Bic-Po, and NaOH0.1-Po fractions. The distribution of soil P fractions was associated with soil use type. Conventional farming systems stimulated P retention in Fe-Al oxides (NaOH0.1-Pi and Residual-Pi) and decreased P availability. Compared to cultivated soil, the higher organic P proportion under forest corresponded to higher organic matter (OM) and microbial P, which highlights the potential relevance of SOM and microbial P in sustaining P availability in P-limited acidic soils. Sustainability in cropped systems could be enhanced by promoting adequate management practices aimed at increasing soil organic P storage and reducing soil chemical reactions that absorb, occlude or precipitate applied inorganic P.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[fraccionamiento de Hedley]]></kwd>
<kwd lng="es"><![CDATA[materia orgánica]]></kwd>
<kwd lng="es"><![CDATA[P microbiano]]></kwd>
<kwd lng="es"><![CDATA[sistema de cultivo intensivo]]></kwd>
<kwd lng="es"><![CDATA[sistema natural]]></kwd>
<kwd lng="en"><![CDATA[Hedley fractionation]]></kwd>
<kwd lng="en"><![CDATA[organic matter]]></kwd>
<kwd lng="en"><![CDATA[microbial P]]></kwd>
<kwd lng="en"><![CDATA[intensive cropping system]]></kwd>
<kwd lng="en"><![CDATA[natural system]]></kwd>
</kwd-group>
</article-meta>
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