<?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>2215-3470</journal-id>
<journal-title><![CDATA[Uniciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Uniciencia]]></abbrev-journal-title>
<issn>2215-3470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional, Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34702022000100166</article-id>
<article-id pub-id-type="doi">10.15359/ru.36-1.10</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de nitratos en el Humedal Nacional Térraba-Sierpe]]></article-title>
<article-title xml:lang="en"><![CDATA[Nitrates Evaluation in the National Térraba-Sierpe Wetland]]></article-title>
<article-title xml:lang="pt"><![CDATA[Avaliação de nitrato na Zona Úmida Nacional Térraba-Sierpe]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Alpízar]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Molina]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Technological Institute of Costa Rica Chemistry Department ]]></institution>
<addr-line><![CDATA[Cartago ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Technological Institute of Costa Rica Chemistry Department ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>166</fpage>
<lpage>176</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34702022000100166&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34702022000100166&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34702022000100166&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de esta investigación fue describir espacial y temporalmente las concentraciones de nitratos en correlación con las actividades antropogénicas que rodean el río Sierpe que atraviesa el Humedal Nacional Térraba-Sierpe (HNTS). Aunque protegido territorialmente por la legislación costarricense, este humedal está rodeado por una intensa actividad agrícola. En el 2018 se realizó un monitoreo mensual de pH, nitratos y oxígeno disuelto (OD) en catorce puntos del río. Se obtuvo una línea base alrededor de 5 mg NO3 -/L en períodos sin actividades agrícolas y picos hasta de 20 mg NO3 -/L después de las actividades de fertilización. Correspondientemente se observó disminución de OD y pH en los días de alta actividad agrícola. En los meses posteriores a la fertilización, los colaboradores del programa de manejo y vigilancia del HNTS observan un crecimiento acelerado de plantas acuáticas y un deterioro general en la reproducción del manglar. Sin embargo, cuando se observa una alta concentración de nitratos en áreas agrícolas, también se observa su declive en la dirección del flujo del río hasta su desembocadura. Este hecho muestra la función aún activa del humedal y su importancia en el procesamiento de nitratos. Se recomienda regular las actividades no solo en el límite territorial sino también en los límites del sistema hídrico circundante al HNTS para proteger esta función ecosistémica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This research aimed to describe, spatially and temporally, the concentrations of nitrates in correlation with anthropogenic activities surrounding the Sierpe River that crosses the National Térraba-Sierpe Wetland (HNTS). Although territorially protected by Costa Rican legislation, this wetland is surrounded by intense agricultural activity. In 2018, monthly monitoring of pH, nitrates, and dissolved oxygen was carried out in fourteen points of the river. A baseline around 5 mg NO3 - / L was obtained in periods without agricultural activities and peaks up to 20 mg NO3 - / L after fertilization activities. Correspondingly, a decrease in dissolved oxygen and pH was observed on days of high agricultural activity. In the months following fertilization, accelerated growth of aquatic plants and a general deterioration in mangrove reproduction were observed by collaborators of the HNTS management and surveillance program. Nevertheless, when high nitrates concentration in agricultural areas are observed, their decline is also observed in the direction of the river's flow until it reaches its mouth. This facts shows the still active function of the wetland and its importance in the processing of nitrates. To regulate activities not only in the territorial limit but also in the limits of the water system surrounding the HNTS is recommended to protect this ecosystem function.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Esta pesquisa teve como objetivo descrever espacial e temporariamente as concentrações de nitrato em correlação com as atividades antropogênicas que cercam o rio Sierpe. Este rio atravessa a Zona Úmida Nacional Térraba-Sierpe (HNTS) que, embora territorialmente protegida pela legislação costarriquenha, é cercada por intensa atividade agrícola. Em 2018, foi realizado um monitoramento mensal de pH, nitratos e oxigênio dissolvido em catorze pontos do rio, onde foi obtida uma linha de base em torno de 5 mg NO3 -/L em períodos sem atividades agrícolas e picos de até 20 mg NO3 -/L após eventos de fertilização. Correspondentemente, observou-se a diminuição do oxigênio dissolvido e do pH nos dias de alta atividade agrícola. Nos meses seguintes à fertilização, os colaboradores do programa de gestão e vigilância do HNTS observam um crescimento acelerado de plantas aquáticas e uma deterioração geral na reprodução de manguezais. No entanto, a concentração de nitratos diminui sistematicamente na direção do fluxo do rio até chegar à foz, o que mostra a função ainda ativa da zona úmida e sua importância no processamento de nitratos. A fim de proteger essa função ecossistêmica, recomenda-se a necessidade de regulação das atividades, não apenas dentro do limite territorial, mas também dos limites do sistema de água em torno do HNTS.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[nitrates]]></kwd>
<kwd lng="en"><![CDATA[wetlands]]></kwd>
<kwd lng="en"><![CDATA[sustainable agriculture]]></kwd>
<kwd lng="en"><![CDATA[ecological impacts]]></kwd>
<kwd lng="en"><![CDATA[National Térraba-Sierpe Wetland]]></kwd>
<kwd lng="es"><![CDATA[nitratos]]></kwd>
<kwd lng="es"><![CDATA[humedal]]></kwd>
<kwd lng="es"><![CDATA[agricultura sostenible]]></kwd>
<kwd lng="es"><![CDATA[impactos ecológicos]]></kwd>
<kwd lng="es"><![CDATA[Humedal Nacional Térraba-Sierpe]]></kwd>
<kwd lng="pt"><![CDATA[nitratos]]></kwd>
<kwd lng="pt"><![CDATA[zonas úmidas]]></kwd>
<kwd lng="pt"><![CDATA[agricultura sustentável]]></kwd>
<kwd lng="pt"><![CDATA[impactos ecológicos]]></kwd>
<kwd lng="pt"><![CDATA[Zona Úmida Nacional Térraba-Sierpe]]></kwd>
</kwd-group>
</article-meta>
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