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首页> 外文期刊>Journal of arid environments >Are Fabiana imbricata shrublands advancing over northwestern Patagonian grasslands? A population dynamics study involving fire and precipitation
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Are Fabiana imbricata shrublands advancing over northwestern Patagonian grasslands? A population dynamics study involving fire and precipitation

机译：Fabiana inbricata灌木丛是否在巴塔哥尼亚西北草原上发展？涉及火灾和降水的人口动态研究

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摘要

Shrub encroachment is the advance of woody plants over grasslands. For some shrub species this process is favoured by fire and high precipitation. In northwestern Patagonia spring precipitation is related with the El Nifio Southern Oscillation (ENSO). Over the past years, ENSO has shown an increase in both amplitude and frequency. Our study focuses on the population dynamics of the shrub Fabiana imbricata Ruiz & Pav. (Solanaceae) using stochastic models which involve different fire frequencies and variations in spring precipitation. Our results indicate that F. imbricata's population grows at a wide range of fire frequencies, reaching its maximum every 6—10 years. The elasticity analysis show that, as fire frequency diminishes, population growth rate depends almost exclusively on adult survival, recruitment events are rare and the presence of seedlings or juveniles is seldom observed. In this case, the landscape would be formed by mature E imbricata shrublands, and population persistence would depend on adult survival, seed production and their accumulation in the soil bank. However, in the case of very high fire frequencies, more recurrent recruitment pulses would be observed, with a landscape dominated by young shrublands composed of individuals of different ages and reproductive status.
机译：灌木丛侵害是木本植物在草原上的发展。对于某些灌木物种，火和高降水量有利于该过程。在巴塔哥尼亚西北部，春季降水与El Nifio南方涛动（ENSO）有关。在过去的几年中，ENSO的幅度和频率都有所增加。我们的研究重点是灌木Fabiana imbricata Ruiz＆Pav的种群动态。 （茄科）使用随机模型，其中涉及不同的发火频率和春季降水的变化。我们的结果表明，纤毛镰刀菌的种群在广泛的着火频率下增长，每6-10年达到最大值。弹性分析表明，随着着火频率的降低，种群的增长速度几乎完全取决于成年存活率，募集事件很少，很少观察到幼苗或幼虫的存在。在这种情况下，景观将由成熟的茵茵灌木灌木地形成，种群的持久性将取决于成虫的生存，种子生产及其在土壤库中的积累。但是，在火灾频率很高的情况下，将观察到更多的周期性募集脉冲，其景观以年轻灌木丛为主体，该灌木丛由不同年龄和生殖状况的个体组成。

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  • 来源
    《Journal of arid environments》 |2012年第8期|p.78-85|共8页
  • 作者

    M.I. de Torres Curth; L. Ghermandi; C. Biscayart;

  • 作者单位

    Laboratorio Ecotono - Departamemo de Matematica, IN1BI0MA - Universidad National del Comahue, Quintral 1250, 8400 San Carlos de Bariloche, Rio Negro, Argentina;

    Laboratorio Ecotono - Departamemo de Matematica, IN1BI0MA - Universidad National del Comahue, Quintral 1250, 8400 San Carlos de Bariloche, Rio Negro, Argentina;

    Laboratorio Ecotono - Departamemo de Matematica, IN1BI0MA - Universidad National del Comahue, Quintral 1250, 8400 San Carlos de Bariloche, Rio Negro, Argentina;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    elastiticities; patagonian steppe; shrub encroachment; stochastic models;

    机译：弹力巴塔哥尼亚草原灌木侵蚀随机模型;

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