<?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>S1405-31952018000100129</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta fisiológica de taxodium mucronatum Ten. a los incrementos atmosféricos de CO2 y temperatura del último siglo]]></article-title>
<article-title xml:lang="en"><![CDATA[Physiological response of Taxodium mucronatum Ten. to the increases of atmospheric CO2 and temperature in the last century]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Díaz]]></surname>
<given-names><![CDATA[Arian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Guerrero]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-Díaz]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Lucas C. R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Horwath]]></surname>
<given-names><![CDATA[William R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castruita-Esparza]]></surname>
<given-names><![CDATA[Luis U.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Trinidad]]></surname>
<given-names><![CDATA[Tomás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Espinosa]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Laboratorio de Dendrocronología ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Oregon Institute of Ecology and Evolution Environmental Studies Program, Department of Geography]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of California Department of Land Air and Water Resources Biogeochemistry and Nutrient Cycling Lab]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>129</fpage>
<lpage>149</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000100129&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000100129&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000100129&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El incremento de CO2 atmosférico puede influir en el crecimiento de la vegetación provocando cierre estomático, cambios en la eficiencia de uso de agua o un efecto de fertilización que lleva a mayor crecimiento. Sin embargo, la respuesta de la vegetación depende de las condiciones ambientales y de la fisiología de cada especie. El objetivo del presente estudio fue evaluar composición de isótopos de carbono y oxigeno (&#948;13C y &#948;18O), discriminación neta de 13C (&#916;13C), tasa de crecimiento en área basal (IAB) y eficiencia de uso de agua intrínseca (iWUE) de Taxodium mucronatum Ten. en los últimos 100 años en tres regiones del centro de México. Las hipótesis fueron: 1) la respuesta fisiológica de T. mucronatum Ten. a la variación climática es diferente entre regiones; 2) los cambios en la tasa de crecimiento en área basal y variables fisiológicas de ahuehuete sugieren efectos de fertilización en el último siglo. Las regiones estudiadas fueron: Estado de México (MEX), Querétaro (QRO) y Morelos (MOR) con precipitación de 600, 750 y 1038 mm. En cada sitio se muestrearon nueve árboles para construir una cronología común. En los anillos de crecimiento se analizó &#948;13C y &#948;18O para estimar la discriminación (&#916;13C), concentración interna de CO2 (Ci) y la iWUE en el último siglo. Los datos se analizaron como muestras repetidas en el tiempo con espaciado variable. La diferencia entre sitios se probó con un análisis multivariado de la varianza (MANOVA) y pruebas de contrastes. El &#948;13C en la madera y Ci variaron con el régimen de humedad en MEX y MOR. En las últimas cinco décadas, &#948;18O y la temperatura media anual (TMA) aumentaron 4 &#8240; y de 1.2 a 2.4 °C, respectivamente. Desde 1950, &#916;13C decreció en 1.1 &#8240; y la iWUE aumentó 50 %. El incremento en Ca, iWUE y TMA se relacionó con la disminución de IAB en el sito MEX, y aumento pequeño en IAB en QRO y MOR, lo que indica un efecto diferente de fertilización de CO2 de acuerdo con el gradiente de humedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The increase of atmospheric CO2 can influence the growth of vegetation causing stomatal closure, changes in the wateruse efficiency, or a fertilization effect that leads to greater growth. However, the response of vegetation depends on the environmental conditions and physiology of each species. The objective of this study was to evaluate the composition of carbon and oxygen isotopes (&#948;13C and &#948;18O) the net discrimination of 13C (&#916;13C), the growth rate in basal area (IAB) and the intrinsic water-use efficiency (iWUE) of Taxodium mucronatum Ten. (Montezuma baldcypress) over the last 100 years in three regions of central Mexico. The hypotheses were: 1) the physiological response of T. mucronatum Ten. to climatic variation is different among regions; 2) changes in the growth rate in basal area and physiological variables of the Montezuma baldcypress tree suggest that fertilization effects took place in the last century. The regions under study were: Estado de México (MEX), Querétaro (QRO), and Morelos (MOR), with 600, 750, and 1038 mm rainfall. Nine trees per site were sampled to build a common chronology. In the growth rings, &#948;13C and &#948;18O were analyzed to estimate discrimination (&#916;13C), internal CO2 concentration (Ci), and iWUE in the last century. The data were analyzed as samples repeated over time with variable spacing. The difference between sites was tested with a multivariate analysis of variance (MANOVA) and contrasts tests. The &#948;13C on wood and Ci varied according to the moisture regime in MEX and MOR. In the past five decades, &#948;18O increased by 4 &#8240; and the average annual temperature (AAT) increased from 1.2 to 1.4 °C. Since 1950, &#916;13C decreased by 1.1 &#8240; and iWUE increased by 50 %. The increase in Ca, iWUE, and AAT was related to the IAB decrease in MEX site, and a slight IAB increase in QRO and MOR, indicating a different CO2 fertilization effect depending on the moisture gradient.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ahuehuete]]></kwd>
<kwd lng="es"><![CDATA[estrés hídrico]]></kwd>
<kwd lng="es"><![CDATA[isótopos estables]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="en"><![CDATA[Montezuma baldcypress]]></kwd>
<kwd lng="en"><![CDATA[hydric stress]]></kwd>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
</kwd-group>
</article-meta>
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