<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792022000100123</article-id>
<article-id pub-id-type="doi">10.28940/terra.v40i0.1211</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia de las biocostras en el flujo de CO2 en el matorral desértico micrófilo del altiplano mexicano]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of biocrusts on the CO2 flux in the microphyllous desert shrubland of the Mexican plateau]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Gutiérrez]]></surname>
<given-names><![CDATA[Maritza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Aguilar]]></surname>
<given-names><![CDATA[Dinorah O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pando-Moreno]]></surname>
<given-names><![CDATA[Marisela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Rodríguez]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Linares Nuevo León]]></addr-line>
<country>Mexico</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>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792022000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792022000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792022000100123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El CO2 del suelo se produce por la mineralización de la materia orgánica y la respiración de organismos del suelo. Las biocostras contribuyen a dicho flujo y son claves en el funcionamiento de ecosistemas áridos y semiáridos. Esta investigación se realizó en áreas de matorral desértico micrófilo donde se seleccionaron cuatro microambientes: área abierta sin biocostras (Aa), área abierta con biocostras (AaC), bajo planta sin biocostras (Bp) y bajo planta con biocostras (BpC). Las biocostras estuvieron constituidas predominantemente por líquenes y cianobacterias. Se probaron las siguientes hipótesis: i) las biocostras contribuyen, en mayor medida que las plantas vasculares de estas áreas, a la respiración del suelo; ii) la respiración del suelo es mayor en los microambientes con biocostras que en áreas abiertas sin biocostras; iii) las tasas de respiración del suelo aumentan conforme aumenta la temperatura del suelo, independientemente de la presencia/ausencia de biocostras. La respiración se midió in situ con un equipo EGM-4 con cámara cerrada de respiración de suelo. Los datos se analizaron mediante pruebas de Kruskal Wallis y U de Mann Whitney. La relación entre temperatura y tasa de respiración de suelo se evaluó mediante correlación de Spearman. Los análisis estadísticos se realizaron en el programa SPSS® Statistics versión 19. Los resultados mostraron que la tasa de respiración promedio (3.03 &#956;mol CO2 m-2 s-1) fue mayor en suelo con biocostras que sin éstas. Las tasas de respiración difirieron entre micrositios. Los microambientes AaC, BpC y Bp presentaron mayores tasas de respiración y fueron iguales entre sí y diferentes de Aa; si bien este último fue igual a Bp. Los resultados mostraron una relación positiva entre respiración y temperatura del suelo para todos los microambientes. Se concluye que las tasas de respiración fueron mayores en las áreas que presentaban cobertura de biocostras &#8805; 40%, tanto en presencia como en ausencia de plantas vasculares, que en suelo sin biocostras.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Carbon dioxide (CO2) in the soil is produced by mineralization of organic matter and by respiration of soil organisms. Biocrusts contribute to this flux and is a key factor for the functioning of arid and semi-arid ecosystems. This research was conducted in an area of microphyllous desert shrubland in northeastern Mexico. Four microenvironments were selected: open area without biocrusts (Aa), open area with biocrusts (AaC), under plant without biocrusts (Bp) and under plant with biocrusts (BpC). The biocrusts were mainly constituted by lichens and cyanobacteria. The following hypotheses were tested: i) biocrusts contribute to soil respiration in these areas to a greater extent than vascular plants; ii) soil respiration is higher in biocrusts microenvironments than in open areas without biocrusts; iii) soil respiration rates increase as soil temperature increases, regardless of the presence/ absence of biocrusts. Soil respiration was measured in situ using an EGM-4 equipment with a closed soil respiration chamber. Data were analyzed by Kruskal Wallis and Mann Whitney U tests. The relationship between temperature and soil respiration rate was evaluated with a Spearman correlation analysis. Statistical analyzes were performed in the SPSS® Statistics version 19 software. The results showed that the average respiration rate was higher in soil with biocrusts than in soils lacking biocrusts, with 3.03 &#956;mol CO2 m-2 s-1. Respiration rates differed between microsites. AaC, BpC and Bp microenvironments reached equal respiration rates among them and were overall higher than the soil respiration rates in Aa, except for Bp, which showed similar values. The results also showed a positive relationship between soil respiration and temperature for all microenvironments. We conclude that the respiration rates were higher in areas with biocrust coverage &#8805; 40%, compared with soil without biocrusts, both in the presence and absence of vascular plants.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[desierto Chihuahuense]]></kwd>
<kwd lng="es"><![CDATA[respiración del suelo]]></kwd>
<kwd lng="es"><![CDATA[tasa de respiración]]></kwd>
<kwd lng="es"><![CDATA[zonas áridas]]></kwd>
<kwd lng="en"><![CDATA[Chihuahuan desert]]></kwd>
<kwd lng="en"><![CDATA[soil respiration]]></kwd>
<kwd lng="en"><![CDATA[respiration rate]]></kwd>
<kwd lng="en"><![CDATA[arid zones]]></kwd>
</kwd-group>
</article-meta>
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