<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952018000500653</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia potencial de las emisiones y el transporte de N y S en el Valle de Orizaba, Veracruz, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Potential influence of emissions and transport of N and S in the Orizaba Valley, Veracruz, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerón-Bretón]]></surname>
<given-names><![CDATA[Rosa M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerón-Bretón]]></surname>
<given-names><![CDATA[Julia G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kahl]]></surname>
<given-names><![CDATA[Jonathan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Severino]]></surname>
<given-names><![CDATA[Reyna del C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel-Marrón]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rustrián-Portilla]]></surname>
<given-names><![CDATA[Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Carmen Facultad de Química ]]></institution>
<addr-line><![CDATA[Ciudad del Carmen Campeche]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Wisconsin Departamento de Ciencias Matemáticas ]]></institution>
<addr-line><![CDATA[Milwaukee WI]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma del Carmen Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Ciudad del Carmen Campeche]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Veracruzana Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[Orizaba Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>5</numero>
<fpage>653</fpage>
<lpage>670</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000500653&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000500653&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000500653&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El depósito atmosférico de sustancias acidificantes alteradoras del equilibrio de los sistemas montañosos tropicales altamente sensibles al depósito de compuestos de N y S se ha estudiado poco en México. El objetivo del estudio fue evaluar la distribución espacial y temporal del depósito de N y S, durante un año, en el Valle de Orizaba, y estimar el efecto del transporte a gran escala de emisiones regionales de SO2 sobre el depósito atmosférico de S en la región. La hipótesis fue que los depósitos de N y S en el Valle de Orizaba provienen de fuentes locales y regionales, respectivamente. Los depósitos de N y S se midieron en recolectores pasivos con resinas de intercambio iónico (RII) en 10 sitios, a lo largo del Valle de Orizaba, Veracruz, México, en 2015. Los iones retenidos (   N O  3  -,    N H  4  + y    S O  4  2 -) en la columna RII se extrajeron con KCl 2 N y analizaron por el método colorimétrico del indofenol azul y turbidimetría. Las cantidades medias anuales de N y S depositados fueron 1.42 y 27.25 kg ha-1 año-1. El flujo de S excedió casi seis veces la carga crítica propuesta para áreas sensibles; lo que es una posible amenaza de acidificación en la región. El transporte a gran escala fue evidente durante la estación de lluvias y de frentes fríos (Nortes). El depósito atmosférico de    N O  3  -,    N H  4  + tuvo origen local y el de    S O  4  2 - fue de fuentes regionales; la contribución fue mayor cuando el Valle de Orizaba estuvo sujeto a vientos alisios y del norte. Los niveles de fondo de    S O  4  2 - incrementaron por el transporte de emisiones liberadas de plataformas de la Sonda de Campeche y fuentes industriales en el norte de México, con influencia en el depósito de S en esa región de Veracruz.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract There have been few studies in Mexico about the atmospheric deposition of acidified substances that modify the balance of tropical mountain systems, which are highly sensitive to N and S compound deposits. The objective of this study was to evaluate the spatial and temporal distribution of N and S deposits during a year, in the Orizaba Valley, and to estimate the effect produced by the large-scale transport of SO2 regional emissions in S atmospheric deposits. The hypothesis was that N and S deposits in the Orizaba Valley are produced by local and regional sources, respectively. N and S deposits were measured in 2015, using passive collectors with ion-exchange resin (RII) in 10 sites, throughout the Orizaba Valley, Veracruz, Mexico. The ions (   N O  3  -,    N H  4  + and    S O  4  2 -) retained in the RII column were extracted using KCl 2 N, analyzed using the indophenol blue method, and subject to a turbidimetric analysis. The annual average N and S deposits were 1.42 and 27.25 kg ha-1 year-1. The S flow exceeded almost sixfold the critical load proposed for sensitive areas. This represents a potential acidification threat for the region. During the rainy and cold fronts (nortes) seasons, large-scale transport was evident. The    N O  3  - and    N H  4  + and atmospheric deposits had a local origin while    S O  4  2 - had a regional origin; the contribution was higher when the trade and north winds blew in the Orizaba Valley. The    S O  4  2 - background levels increased as a result of the transport of emissions released by the platforms in the Sonda de Campeche and by industrial sources in northern Mexico that influence S deposit in that region of Veracruz.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[depósito atmosférico]]></kwd>
<kwd lng="es"><![CDATA[N]]></kwd>
<kwd lng="es"><![CDATA[S]]></kwd>
<kwd lng="es"><![CDATA[Valle de Orizaba]]></kwd>
<kwd lng="es"><![CDATA[Veracruz]]></kwd>
<kwd lng="en"><![CDATA[atmospheric deposition]]></kwd>
<kwd lng="en"><![CDATA[N]]></kwd>
<kwd lng="en"><![CDATA[S]]></kwd>
<kwd lng="en"><![CDATA[Orizaba Valley]]></kwd>
<kwd lng="en"><![CDATA[Veracruz]]></kwd>
</kwd-group>
</article-meta>
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