<?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>S0187-57792013000500315</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calibración in situ del sensor cosmos para determinar humedad del suelo en escalas intermedias (~1 km)]]></article-title>
<article-title xml:lang="en"><![CDATA[In situ calibration of cosmos sensor to determine the soil moisture at an intermediate scale (~1 km)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz Bautista]]></surname>
<given-names><![CDATA[Fidencio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Julio Cesar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Watts]]></surname>
<given-names><![CDATA[Christopher J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vivoni]]></surname>
<given-names><![CDATA[Enrique R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yépez]]></surname>
<given-names><![CDATA[Enrico A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robles Morua]]></surname>
<given-names><![CDATA[Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garatuza Payan]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tarin]]></surname>
<given-names><![CDATA[Tonatzin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schreiner McGraw]]></surname>
<given-names><![CDATA[Adam P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sonora Departamento de Agricultura y Ganadería ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sonora Departamento de Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Arizona State University School of Earth and Space Exploration ]]></institution>
<addr-line><![CDATA[Tempe AZ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico de Sonora Departamento de Ciencias del Agua y Medio Ambiente ]]></institution>
<addr-line><![CDATA[Ciudad Obregón Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>31</volume>
<numero>4</numero>
<fpage>315</fpage>
<lpage>324</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792013000500315&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792013000500315&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792013000500315&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La heterogeneidad del suelo influye ampliamente en el contenido de humedad, dificultando la precisa determinación de este parámetro en estudios con fines hidrológicos y ecológicos que requieren de mediciones continuas y representativas para escalas intermedias (~1 km). En este contexto un sensor de neutrón de rayo cósmico The COsmic-ray Soil Moisture Observing System (COSMOS) permite cuantificar humedad del suelo de manera continua y a escalas espaciales de cientos de metros. El objetivo de este estudio fue evaluar un esquema de calibración para un sensor COSMOS CRS-1000. El estudio se realizó en una sabana de zacate buffel (Pennisetum ciliare) en Rayón Sonora, México. En este sitio se instaló el COSMOS CRS-1000 y para su calibración se realizaron muestreos de suelo en dos etapas. A estas muestras se les determinó el contenido de humedad y su densidad aparente por técnicas gravimétricas. Con el contenido de humedad de estas muestras, expresado en términos volumétricos, se obtuvo por aproximación el parámetro de calibración para el COSMOS CRS-1000. El valor obtenido para este parámetro fue de 4121 conteos por hora (tasa de conteo del neutrón sobre suelo). Con este valor se realizó la corrección a los valores estimados originalmente por el sensor COSMOS CRS-1000. Al realizar esta corrección, se observó un incremento en el contenido de humedad del suelo de 1 a 2 % con respecto a los valores estimados con el COSMOS CRS-1000 en todo el periodo de análisis. A pesar de la variabilidad espacial en el contenido de humedad del suelo bajo estudio, se observó que el sensor COSMOS CRS-1000 tiene la capacidad de proveer estimaciones razonables del contenido de la humedad del suelo de manera continua a una profundidad de 0 a 40 cm, en una superficie de alrededor de 30 ha.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Soil heterogeneity greatly influences moisture content, making it difficult to accurately determine this parameter in hydrological and ecological studies that require continuous representative measurements at intermediate scales (~1 km). In this context, the COsmic-ray Soil Moisture Observing System (COSMOS) enables us to quantify soil moisture continuously at spatial scales of hundreds of meters. The objective of this study was to evaluate a scheme for calibrating a COSMOS CRS-1000 sensor. The study was conducted in a buffel grass (Pennisetum ciliare) savanna in Rayon, Sonora, Mexico. Here, a COSMOS CRS-1000 was installed, and for calibration, two soil samplings were conducted. These samples were analyzed for moisture content and bulk density by gravimetric techniques. The moisture content of the samples, expressed in terms of volume, was used to obtain the calibration parameter by approximation for the CRS-1000 COSMOS. The value for this parameter was 4121counts per hour (neutron count rate of soil). With this value, correction to the values originally estimated by COSMOS CRS-1000 sensor was performed. With this correction, there was an increase in soil moisture content of 1 to 2% compared with the values estimated with the CRS1000 COSMOS throughout the period of analysis. Despite the spatial variability in the moisture content of the soil under study, it was observed that the CRS-1000 COSMOS sensor has the capability of providing a reasonable continuous estimate of moisture content soil to a depth of 0 to 40 cm, in an area of about 30 ha.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[precipitación]]></kwd>
<kwd lng="es"><![CDATA[neutrones]]></kwd>
<kwd lng="es"><![CDATA[rayos cósmicos]]></kwd>
<kwd lng="es"><![CDATA[Rayón Sonora]]></kwd>
<kwd lng="es"><![CDATA[zacate buffel]]></kwd>
<kwd lng="en"><![CDATA[precipitation]]></kwd>
<kwd lng="en"><![CDATA[cosmic rays]]></kwd>
<kwd lng="en"><![CDATA[neutrons]]></kwd>
<kwd lng="en"><![CDATA[Rayon Sonora]]></kwd>
<kwd lng="en"><![CDATA[buffel grass]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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