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Fire as a stimulant of shrub recruitment in northwestern Patagonian (Argentina) grasslands

机译：火在巴塔哥尼亚西北部（阿根廷）草原上作为灌木招募的兴奋剂

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摘要

One strategy of plant survival during post-fire succession is to persist and regenerate by recruiting new individuals from a fire-resistant seed bank. The heat, smoke, and charcoal released during plant combustion may act (individually or in combination) as a cue for post-fire seed germination. Fabiana imbricata is a shrub that forms persistent seed banks in the northwestern Patagonian grasslands and shows a high recruitment from seeds during post-fire succession. Mathematical models showed that this species is advancing over the grasslands in response to fires. To corroborate these findings, we studied the role of fire on F. imbricata seed germination. In order to achieve this, a factorial experiment was designed in laboratory conditions to study the effect of heat, charcoal, smoke, scarification, and their interactions on F. imbricata seed germination. Seeds treated with the higher temperatures required a longer period of time to germinate, thus, significantly affecting the mean germination time. Total germination percentages in F. imbricata were significantly enhanced by smoke and scarification, but the interaction of heat, smoke, and scarification was more important than the effect of each fire factor alone. The positive response to fire cues exhibited by F. imbricata indicates that this species would have an adaptive advantage to colonize these grasslands if fire frequency increased, as predicted for this environment. Hence, fire will contribute to the grassland encroachment by this species and, therefore, to the loss of biodiversity and productivity of northwestern Patagonian grasslands.
机译：射击后演替过程中植物存活的一种策略是通过从耐火种子库招募新的个体来坚持和再生。植物燃烧过程中释放的热量，烟气和木炭可能（单独或组合）充当火后种子发芽的线索。 Fabiana imbricata是一种灌木，在巴塔哥尼亚西北部的草原上形成持久的种子库，并在火后演替期间显示出种子的高吸收性。数学模型表明，该物种在大火中正在草原上前进。为了证实这些发现，我们研究了火对棉铃虫种子萌发的作用。为了实现这一目标，在实验室条件下设计了析因实验，以研究热量，木炭，烟尘，划痕及其相互作用对棉铃虫种子萌发的影响。用较高温度处理的种子需要更长的时间才能发芽，因此，显着影响平均发芽时间。烟和划痕明显增加了纤毛镰刀菌的总发芽率，但热量，烟和划痕的相互作用比单独每种火因子的影响更重要。 F. imbricata对火线索的积极反应表明，如果火频率增加，该物种将具有适应优势，可以在这些草原上定居，正如对此环境的预测。因此，火灾将加剧该物种对草原的入侵，并因此导致西北巴塔哥尼亚草原生物多样性和生产力的丧失。

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  • 来源
    《Ecological research》 |2013年第6期|981-990|共10页
  • 作者

    N. Dudinszky; L. Ghermandi;

  • 作者单位

    Laboratorio Ecotono, Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente, (CONICET-UNCOMA),Quintral 1250, 8400 Bariloche, Argentina;

    Laboratorio Ecotono, Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente, (CONICET-UNCOMA),Quintral 1250, 8400 Bariloche, Argentina;

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  • 正文语种 eng
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  • 关键词

    Fabiana imbricata; Fire; Grassland; Dormancy; Germination; Smoke;

    机译：Fabiana inbricata;火;草原;休眠;发芽;抽烟;

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