<?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>S0120-28122020000200106</article-id>
<article-id pub-id-type="doi">10.15446/acag.v69n2.82206</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluation of impacts of potato crops and livestock farming in Neotropical high Andean Páramo soils, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de impactos del cultivo de papa y la explotación ganadera en suelos de Páramo Neotropical alto Andino, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Farfán]]></surname>
<given-names><![CDATA[María-Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Forero]]></surname>
<given-names><![CDATA[Sandra-Milena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avellaneda-Torres]]></surname>
<given-names><![CDATA[Lizeth-Manuela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Libre  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>69</volume>
<numero>2</numero>
<fpage>106</fpage>
<lpage>116</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122020000200106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122020000200106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122020000200106&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Páramos are Neotropical ecosystems that result from insular formations dominated by tufted hair grasses and shrubs, and are located above the continuous forest track and below the perpetual snowline of the highest peaks in the Northern Andes. The aim of this research was to check the reliability of the hypothesis that the potato cultivation and livestock farming activities modify the quality of Páramo soils. For this, soil samples were taken from soil used with three different purposes at two different heights: Páramo with the least possible intervention, and Páramo where the activities of potato cropping and livestock farming were carried out; from these, and that have been determined to have physicochemical properties, abundance of functional groups of microorganisms (nitrogen-fixing, phosphate solubilizers, cellulolytic microorganisms), and enzymatic activities (urease, protease, p-glucosidase, acid, and alkaline phosphatase). The gravimetric humidity, apparent density, organic carbon, cation exchange capacity, urease, acid phosphatase, and p-glucosidase showed statistically significant differences (P &lt; 0.05), indicating that there is a change in the quality of the soil that is exposed to agricultural activities. As for microorganisms the hypothesis was not confirmed; there are warning signs for the future in the case of continuing with these practices, but there are no significant differences.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los Páramos son ecosistemas neotropicales resultantes de formaciones insulares dominadas por gramíneas en matojo y matorrales que se encuentran por encima de la línea de bosque continua y por debajo de la línea de nieves perpetuas de las cumbres más altas de los Andes Septentrionales. El objetivo de esta investigación fue evaluar las hipótesis existentes sobre el impacto que el cultivo de papa y la explotación ganadera tienen en la calidad de los suelos de Páramo. Para ello, se realizaron muestreos en tres usos del suelo a dos alturas diferentes: Páramo con la menor intervención posible y Páramo donde se realizan las actividades de cultivo de papa y explotación ganadera, en los que se determinaron las propiedades fisicoquímicas, abundancia de grupos funcionales de microorganismos (fijadores de nitrógeno, solubilizadores de fosfato, celulolíticos) y actividades enzimáticas (ureasa, proteasa, p-glucosidasa, fosfatasa ácida y alcalina). La humedad gravimétrica, la densidad aparente, el carbono orgánico, la capacidad de intercambio catiónico, la ureasa, la fosfatasa ácida y la p-glucosidasa mostraron diferencias estadísticamente significativas (P &lt; 0.05), lo cual indica que la calidad del suelo expuesto a actividades agrícolas y ganaderas está siendo modificada. Mientras que, para los microorganismos, la hipótesis no se confirmó, no obstante, existen señales de advertencia para el futuro en el caso de continuar con estas prácticas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Actividad enzimática]]></kwd>
<kwd lng="es"><![CDATA[Bacterias fijadoras de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[Bacterias solubilizadoras de fosfatos]]></kwd>
<kwd lng="es"><![CDATA[Microorganismos celulolíticos]]></kwd>
<kwd lng="es"><![CDATA[Propiedades fisicoquímicas del suelo.]]></kwd>
<kwd lng="en"><![CDATA[Cellulolytic microorganisms]]></kwd>
<kwd lng="en"><![CDATA[Enzymatic activities]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen-fixing bacteria]]></kwd>
<kwd lng="en"><![CDATA[Phosphate solubilizing bacteria]]></kwd>
<kwd lng="en"><![CDATA[Soil physicochemical properties]]></kwd>
</kwd-group>
</article-meta>
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