<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982020000100086</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2178</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Population structure and quantitative characteristics of Tetracentron sinense (Trochodendraceae) in Leigong Mountain Nature Reserve, China]]></article-title>
<article-title xml:lang="es"><![CDATA[Estructura poblacional y características Tetracentron sinense cuantitativas de (Trochodendraceae) en la Reserva Natural de la Montaña Leigog, China]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Huan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duan]]></surname>
<given-names><![CDATA[Fan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Yang]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Qinqin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lu]]></surname>
<given-names><![CDATA[Xueheng]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gan]]></surname>
<given-names><![CDATA[Xiaohong]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Xie]]></surname>
<given-names><![CDATA[Zhenguo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tang]]></surname>
<given-names><![CDATA[Junfeng]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Ministry of Education Key laboratory of southwest China wildlife resources conservation ]]></institution>
<addr-line><![CDATA[Nanchong ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,China West Normal University Institute of Plant Adaptation and Utilization in Southwest Mountain ]]></institution>
<addr-line><![CDATA[Nanchong ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Leigong Mountain National Nature Reserve Administration Bureau  ]]></institution>
<addr-line><![CDATA[Leishan county Guizhou Province]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>98</volume>
<numero>1</numero>
<fpage>86</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982020000100086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982020000100086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982020000100086&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Knowledge of plant population structure facilitates conservation, management, and utilization of endangered plants.  Research question: What is the current status of the natural populations of Tetracentron sinense in Leigong Mountain Nature Reserve (LMNR) and what future population development trends can be predicted?  Studied species: Tetracentron sinense.  Study site and period of research: T. sinense populations in LMNR in China in 2018.  Methods:  The population structure and quantity dynamics of four typical patches were studied using static life tables, survival curves, survival analyses, and time series analyses.  Results:  The age structures of the T. sinense populations were spindle-shaped, with few seedlings and saplings, and Deevey type II and III survival curves. The mortality rate (q  x ) of each patch increased quickly, and then plateaued, finally increasing again. Survival rate (S  x ) showed a contrary trend to q  x . Trends in cumulative mortality rate (F  (i) ), killing power (K  x ), mortality density (f  (ti) ), and hazard rate (&#955;  (ti) ) with increasing age class were similar: increasing at a younger age, gradually stabilizing in middle age, and then increasing slightly in older age. The number of individuals in these T. sinense populations was predicted to decrease sharply in future, with younger individuals being seriously deficient. The results showed that the natural populations of T. sinense in the LMNR were relatively stable but were in an early stage of decline.  Conclusions: The lack of younger individuals might reflect a bottleneck for regeneration of T. sinense populations, leading to a decline in population size.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: El conocimiento de la estructura poblacional de una planta facilita su conservación, manejo y utilización.  Pregunta de investigación: ¿Cuál es el estado actual de las poblaciones naturales de Tetracentron sinense en la Reserva Natural de la Montaña Leigong (LMNR) y qué tendencias futuras de desarrollo de la población se pueden predecir?  Especies estudiadas: Tetracentron sinense.  Sitio y período de investigación: Poblaciones en LMNR, China, 2018.  Métodos: Se usaron tablas de vida estáticas, curvas de supervivencia, análisis de supervivencia y análisis de series de tiempo para el análisis de la estructura poblacional y dinámica de parches.  Resultados: Las estructuras de edad de las poblaciones de T. sinense mostraron forma de huso, con pocas plántulas y juveniles. Curvas de supervivencia Deevey tipo II y III. La tasa de mortalidad (q  x ) de cada parche aumentó rápidamente, para estabilizarse y finalmente aumentar nuevamente. La tasa de supervivencia (S  x ) mostró una tendencia contraria a q  x . Las tendencias en las tasas de mortalidad acumulada (F  (i) ), mortalidad (K  x ), densidad de mortalidad (f  (ti) ), y tasa de riesgo (&#955;  (ti) ) fueron similares con el aumento de la clase de edad. Las poblaciones naturales de T. sinense en el LMNR eran relativamente estables, aunque en etapa temprana de disminución. El número de individuos en poblaciones de T. sinense disminuirá drásticamente en el futuro, donde los más jóvenes mostrarán serias deficiencias.  Conclusiones: La ausencia de individuos más jóvenes podría reflejar un cuello de botella para la regeneración de las poblaciones de T. sinense, lo que lleva a una disminución en el tamaño de la población.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Population structure]]></kwd>
<kwd lng="en"><![CDATA[static life table]]></kwd>
<kwd lng="en"><![CDATA[survival analysis]]></kwd>
<kwd lng="en"><![CDATA[time series analysis]]></kwd>
<kwd lng="es"><![CDATA[Análisis de series de tiempo]]></kwd>
<kwd lng="es"><![CDATA[análisis de supervivencia]]></kwd>
<kwd lng="es"><![CDATA[estructura de población]]></kwd>
<kwd lng="es"><![CDATA[tabla de vida estática]]></kwd>
</kwd-group>
</article-meta>
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