<?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>2305-0683</journal-id>
<journal-title><![CDATA[Investigación Agraria]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. Agrar.]]></abbrev-journal-title>
<issn>2305-0683</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, UNA.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2305-06832022000100031</article-id>
<article-id pub-id-type="doi">10.18004/investig.agrar.2022.junio.2401704</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Provisión del servicio ecosistémico de retención de nitrógeno total y su variación bajo usos y coberturas cambiantes en la cuenca del río Jejui Guazú, Paraguay]]></article-title>
<article-title xml:lang="en"><![CDATA[Provisioning of the ecosystem service &#8220;total nitrogen retention&#8221; and its variation under changing land use and coverage in the Jejui Guazú river basin, Paraguay]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra Ruiz Díaz]]></surname>
<given-names><![CDATA[Andrea Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalba Marín]]></surname>
<given-names><![CDATA[Lucía Janet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amarilla Rodríguez]]></surname>
<given-names><![CDATA[Stella Mary]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Paraguay</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>24</volume>
<numero>1</numero>
<fpage>31</fpage>
<lpage>39</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2305-06832022000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2305-06832022000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2305-06832022000100031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Uno de los factores directos más importantes que afectan a los servicios ecosistémicos (SE) y su provisión han sido el cambio del uso y cobertura de la tierra. La ausencia de información de cómo estos factores afectan a la provisión de los servicios pueden llevar a su deterioro o uso no sostenible. Esta investigación fue realizada en la cuenca del río Jejui Guazú, en la Región Oriental de Paraguay, con el fin describir la variación del servicio ecosistémico de retención de nitrógeno total (NT) y ante la reducción de la superficie boscosa sin protección legal, utilizando el modelo InVEST y softwares de Sistema de Información Geográfica. Para este efecto, se generaron el uso y cobertura de la tierra del año 2017 (identificándose ocho clases), modelo digital de elevación, promedio anual de precipitación del mismo año y límite de subcuencas. Los resultados resaltan el rol fundamental de las áreas naturales, tanto bosques como humedales, para el mantenimiento del servicio de retención de nutrientes. Especialmente, los humedales los cuales presentan la mayor proporción porcentual de retención de NT, observándose cuencas cubiertas por humedales con un 90,94 y 91,10%; y la menor disminución de su capacidad con el cambio de la configuración del paisaje reduciéndose solo en un 1,53%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT One of the most important direct drivers affecting ecosystem services (ES) and their provision has been land use and land cover (LULC) change. The absence of information on how these factors affect ecosystem services provision can lead to their deterioration or unsustainable use. This research was carried out in the Jejui Guazú river watershed, in the Eastern Region of Paraguay, in order to describe the variation of the ecosystem service of total nitrogen (TN) retention and under forested area reduction, considering the ones without legal protection using the InVEST model and Geographic Information System&#8217;s software For this purpose, the land use and land cover of the year 2017 (where eight classes were identified), a digital elevation model, the annual average rainfall for the same year and sub-basin limits were generated. The results highlight the fundamental role of natural areas, both forests and wetlands, for the maintenance of the nutrient retention service. Especially, wetlands which present the highest percentage of TN retention, where watersheds covered by wetlands got 90.94 and 91.10% of retention; and the smallest decrease in its retention capacity with the change in the landscape configuration, decreasing only by 1.53%.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[servicios ecosistémicos]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno total]]></kwd>
<kwd lng="es"><![CDATA[uso y cobertura de la tierra]]></kwd>
<kwd lng="es"><![CDATA[sistemas de información geográfica]]></kwd>
<kwd lng="en"><![CDATA[ecosystem services]]></kwd>
<kwd lng="en"><![CDATA[total nitrogen]]></kwd>
<kwd lng="en"><![CDATA[land use land cover]]></kwd>
<kwd lng="en"><![CDATA[geographic information system]]></kwd>
</kwd-group>
</article-meta>
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