<?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>1405-0471</journal-id>
<journal-title><![CDATA[Madera y bosques]]></journal-title>
<abbrev-journal-title><![CDATA[Madera bosques]]></abbrev-journal-title>
<issn>1405-0471</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-04712018000400403</article-id>
<article-id pub-id-type="doi">10.21829/myb.2018.2401898</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biomasa y productividad en las zonas áridas mexicanas]]></article-title>
<article-title xml:lang="en"><![CDATA[Biomass and productivity in Mexican arid lands]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Briones]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Búrquez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Yrízar]]></surname>
<given-names><![CDATA[Angelina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pavón]]></surname>
<given-names><![CDATA[Numa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perroni]]></surname>
<given-names><![CDATA[Yareni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología, A.C.  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ecología ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Centro de Investigaciones Biológicas ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Veracruzana Instituto de Biotecnología y Ecología Aplicada ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>24</volume>
<numero>spe</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-04712018000400403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-04712018000400403&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-04712018000400403&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las zonas áridas mexicanas ocupan 54% de la superficie y las habita más de 40% de la población nacional. Aunque existen pocos estudios sobre la biomasa y flujo de energía de las zonas áridas mexicanas, estos muestran que la biomasa aérea (23.2 Mg ha-1 ± 4.15 Mg ha-1, 23 sitios) y subterránea (11.2 Mg ha-1 ± 3.54 Mg ha-1, 7 sitios) fue superior al promedio de los desiertos del mundo y sus valores altos estuvieron cercanos al intervalo del bosque tropical caducifolio (BTC). La productividad primaria neta de las regiones más secas de las zonas áridas mexicanas (&lt; 0.5 Mg ha-1 año-1 - 3.4 Mg ha-1 año-1) fue similar al promedio de los desiertos del mundo, pero en las regiones menos secas fue casi cuatro veces mayor y similar a los BTC más secos. La producción de hojarasca (2.85 Mg ha-1 año-1 ± 0.64 Mg ha-1 año-1, 12 sitios) fue mayor a los desiertos norteamericanos y en sitios mésicos fue cercana al BTC. La producción de hojas, como en la mayoría de los ecosistemas terrestres, fue el componente que más contribuyó a la producción anual de hojarasca. La tasa de descomposición de la hojarasca (0.001 g C año-1 - 0.44 g C año-1) fue más lenta en comparación con bosques. La respiración microbiana del suelo (28.4 &#956;g C g-1 d-1 ± 5.44 &#956;g C g-1 d-1, 10 sitios) dependió principalmente de la precipitación y la concentración de carbono y nitrógeno. La disponibilidad de agua es el principal factor que regula la biomasa y productividad primaria en las zonas áridas mexicanas. Urge incrementar las investigaciones sobre la dinámica de los ecosistemas áridos, cuya sensibilidad/resiliencia al cambio de uso de suelo y otras presiones persistentes de cambio global es aún incierta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Arid lands cover 54% of Mexico where over 40% of the total population inhabit these areas. Studies on the ecosystem functioning of the Mexican arid lands are still very limited. These studies have shown that mean aboveground biomass (23.2 Mg ha-1 ± 4.15, 23 sites) and belowground biomass (11.2 Mg ha-1 ± 3.54 Mg ha-1, 7 sites) were higher than those of the deserts of the world and their higher values were within the range for tropical deciduous forests (TDF). Net primary productivity in the driest regions of Mexico (&lt; 0.5 Mg ha-1 y-1 - 3.4 Mg ha-1 y-1) was similar to the mean of the deserts of the world, but in the less dry regions it was almost four times larger and similar to the drier TDF. Total litterfall (2.85 Mg ha-1 y-1 ± 0.64 Mg ha-1 y-1, 12 sites) was higher than in the North American deserts and close to the lower end of values for TDF´s. Litter decomposition rate (0.001 g C y-1 - 4 g C y-1) was lower than in non-desert regions. Microbial respiration of soil (28.4 &#956;g C g-1 d-1 ± 5.44 &#956;g C g-1 d-1, 10 sites) depended mainly on precipitation and the concentration of carbon and nitrogen. Water availability is the main factor controlling biomass and productivity in the arid lands of Mexico. Since the sensitivity/resilience to land use change and other persistent global change pressures is still uncertain, more research on the dynamics of arid ecosystems is urgently needed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[carbono]]></kwd>
<kwd lng="es"><![CDATA[descomposición]]></kwd>
<kwd lng="es"><![CDATA[desiertos]]></kwd>
<kwd lng="es"><![CDATA[hojarasca]]></kwd>
<kwd lng="es"><![CDATA[productividad primaria]]></kwd>
<kwd lng="es"><![CDATA[respiración de suelo]]></kwd>
<kwd lng="en"><![CDATA[carbon]]></kwd>
<kwd lng="en"><![CDATA[decomposition]]></kwd>
<kwd lng="en"><![CDATA[deserts]]></kwd>
<kwd lng="en"><![CDATA[litterfall]]></kwd>
<kwd lng="en"><![CDATA[primary productivity]]></kwd>
<kwd lng="en"><![CDATA[soil respiration]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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