<?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>S0187-57792022000100203</article-id>
<article-id pub-id-type="doi">10.28940/terra.v40i0.911</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Protocolo de medición de CO2 para determinar la cantidad mínima en peso de muestras de suelo y mantillo]]></article-title>
<article-title xml:lang="en"><![CDATA[CO2 measurement protocol to determine the minimum amount of soil and litter samples]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrales-Brito]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz-Pellat]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etchevers-Barra]]></surname>
<given-names><![CDATA[Jorge D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo-Moreno]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez-Rodríguez]]></surname>
<given-names><![CDATA[Alma S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Doctorado en edafología  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,GRENASER  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo Laboratorio de Fertilidad de Suelos y Química Ambiental]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma del Estado de México Campus El Cerrillo ]]></institution>
<addr-line><![CDATA[Toluca de Lerdo Estado de México]]></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=S0187-57792022000100203&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792022000100203&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792022000100203&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La materia orgánica del suelo (MOS) y su interacción con las partículas elementales del suelo (PES) determinan las tasas de mineralización, por lo que es necesario medir cuánto CO2 se libera por las fracciones elementales del suelo; sin embargo, con los métodos de fraccionamiento de las PES, se extrae una cantidad muy pequeña, lo que limita hacer ensayos de respiración con los métodos tradicionales, ya que requieren cantidades de 30 g para poder hacer mediciones en laboratorio. En este trabajo se hicieron pruebas para determinar si el equipo OxiTop es capaz de medir la respiración de muestras de suelo en cantidades pequeñas. Se colocaron cantidades de 10.0, 5.0, 1.0 y 0.5 g de muestras de mantillo (M), horizonte de fermentación (HF) y suelo (S) en frascos del equipo de 500 y 250 mL. Los resultados muestran que el equipo registra la cantidad de CO2 en todas las muestras, siendo mayores en el M que en las muestras de S. Además, el tamaño de frasco indicó que la respiración es proporcional al tamaño ya que en los frascos de 500 mL la cantidad de CO2 fue cercano al doble en comparación de los frascos de 250 mL en muestras de M y HF. En muestras de S los valores medidos en ambos frascos fueron muy similares. El equipo OxiTop es capaz de medir la emisión de CO2 en muestras pequeñas, pero el contenido de C de la muestra inf luyó, dado que, si los contenidos de C son bajos, la cantidad de CO2 será menor.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Soil organic matter (SOM) and its interaction with elementary soil particles (ESP) determine mineralization rates. Thus quantifying how much CO2 is released by soil elementary fractions is necessary. However, in the fractionation methods of ESP a very small amount is extracted limiting incubation tests with traditional methods, which require quantities of 30 g to make measurements in the laboratory. Tests were conducted to determine if the OxiTop equipment is capable of measuring the respiration of soil samples in small quantities of 10.0, 5.0, 1.0 and 0.5 g of litter samples (M), fermentation horizon (HF) and soil (S) in 500 and 250 mL equipment bottles. The results show that the equipment records the amount of CO2 in all the samples, which are greater in M than in S samples. In addition, the bottle size indicated that the respiration is proportional to size since in the 500 mL bottles the CO2 amount was nearly double compared to the 250 mL bottles in M and HF samples. In S samples the values measured in both bottles were very similar. The OxiTop equipment is able to measure CO2 emission in small samples. Nevertheless, the C content of the sample inf luenced the results, when the C contents are low the amount of CO2 is lower.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biogeoquímica]]></kwd>
<kwd lng="es"><![CDATA[dinámica de carbono]]></kwd>
<kwd lng="es"><![CDATA[OxiTop]]></kwd>
<kwd lng="es"><![CDATA[respiración]]></kwd>
<kwd lng="en"><![CDATA[biogeochemistry]]></kwd>
<kwd lng="en"><![CDATA[carbon dynamics]]></kwd>
<kwd lng="en"><![CDATA[OxiTop]]></kwd>
<kwd lng="en"><![CDATA[respiration]]></kwd>
</kwd-group>
</article-meta>
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