Abstract Confined to the humid cloud belt of the Macaronesian Islands the Laurel-forests are sensitive to climate changes. Intense natural disturbances are rare and regeneration includes asexual regeneration and dominance of shade intolerant species in the seedling bank. Long-term monitoring of the seedling bank showed that even under these relatively stable conditions high variations occurred. Studies point out to a downward shift of the trade winds cloud belt that confined laurel cloud forests. Only long-term studies can detect the effects of rare extreme events or the influence of slow processes on seedling dynamics. In nine 10 × 10 m plots (six in windward and three in leeward) we monitored the seedling bank monthly from 2000 to 2003 and recount it in 2005 and 2011. Our aim was to estimate seedling dynamics in a Laurel forest. We hypothesized that this forest seedling bank is relatively stable over time. Under present mild temperate climate, we hypothesized that this forest seedling bank is relatively stable over time; seedling recruitment will be positively related to rainfall; sprouting-species will be poorly represented in the seedling bank and growth rate will be higher than observed in other forests. Composition and abundance in seedling bank were stable across 2000–2003. The fluctuation in density, recruitment and mortality for Laurus novocanariensis was determinant for seedling community dynamic, and composition and abundance in seedling bank were stable across first three years and relative seeding growth rate is higher than observed in another subtropical wet montane forests. There was no significant relationship between mortality and recruitment and precipitation. However, in the 2011 count, an increase in density for all species. Except for a hot year in 2010 and a humid one in 2009 for the Canary Islands, there was no record of exceptional weather events or large-scale disturbance episodes in the previous eight years, and these are unlikely to explain the observed increase. Species with seedling banks were more abundant. Nonetheless, few seedlings survive more than two years. We emphasise the importance of long-term studies with fine-scale disturbance monitoring for understanding the dynamic processes of this unique forest.

中文翻译：

---

加那利群岛特内里费岛月桂林中 11 年来的苗库人口统计

摘要 月桂林位于马卡罗尼西亚群岛潮湿的云带中，对气候变化很敏感。强烈的自然干扰是罕见的，再生包括无性再生和苗库中不耐荫物种的优势。对苗库的长期监测表明，即使在这些相对稳定的条件下，也会发生很大的变化。研究指出，限制月桂云雾林的信风云带向下移动。只有长期研究才能发现罕见极端事件的影响或缓慢过程对幼苗动态的影响。在 9 个 10 × 10 m 的地块中（6 个在迎风方向，3 个在背风方向），我们从 2000 年到 2003 年每月监测幼苗库，并在 2005 和 2011 年对其进行重新计数。我们的目的是估计月桂树森林中的幼苗动态。我们假设这个森林苗木库随着时间的推移相对稳定。在目前温和的温带气候下，我们假设该林苗库随着时间的推移相对稳定；幼苗补充与降雨量呈正相关；发芽物种在苗库中的代表性较差，增长率将高于在其他森林中观察到的。2000-2003 年间，幼苗库的组成和丰度保持稳定。Laurus novocanariensis 密度、补充和死亡率的波动是幼苗群落动态的决定因素，幼苗库的组成和丰度在前三年保持稳定，相对播种增长率高于在另一个亚热带湿润山地森林中观察到的。死亡率与补充和降水之间没有显着关系。然而，在 2011 年的统计中，所有物种的密度都有所增加。加那利群岛除 2010 年炎热和 2009 年潮湿外，过去八年没有异常天气事件或大规模扰动事件的记录，这些不太可能解释观测到的增加。具有苗库的物种更为丰富。尽管如此，很少有幼苗能存活超过两年。我们强调了通过精细尺度干扰监测进行长期研究的重要性，以了解这片独特森林的动态过程。过去八年没有异常天气事件或大规模干扰事件的记录，这些不太可能解释观察到的增加。具有苗库的物种更为丰富。尽管如此，很少有幼苗能存活超过两年。我们强调了通过精细尺度干扰监测进行长期研究的重要性，以了解这片独特森林的动态过程。过去八年没有异常天气事件或大规模干扰事件的记录，这些不太可能解释观察到的增加。具有苗库的物种更为丰富。尽管如此，很少有幼苗能存活超过两年。我们强调了通过精细尺度干扰监测进行长期研究的重要性，以了解这片独特森林的动态过程。