Department of Plant and Environmental Sciences, University of Copenhagen, 1871, Frederiksberg, Denmark.
Ecology and Conservation Biology, University of Regensburg, 93040, Regensburg, Germany.
New Phytol. 2023 Oct;240(2):555-564. doi: 10.1111/nph.19173. Epub 2023 Aug 3.
Seed dormancy maximizes plant recruitment in habitats with variation in environmental suitability for seedling establishment. Yet, we still lack a comprehensive synthesis of the macroecological drivers of nondormancy and the different classes of seed dormancy: physiological dormancy, morphophysiological dormancy and physical dormancy. We examined current geographic patterns and environmental correlates of global seed dormancy variation. Combining the most updated data set on seed dormancy classes for > 10 000 species with > 4 million georeferenced species occurrences covering all of the world's biomes, we test how this distribution is driven by climate and fire regime. Seed dormancy is prevalent in seasonally cold and dry climates. Physiological dormancy occurs in relatively dry climates with high temperature seasonality (e.g. temperate grasslands). Morphophysiological dormancy is more common in forest-dominated, cold biomes with comparatively high and evenly distributed precipitation. Physical dormancy is associated with dry climates with strong seasonal temperature and precipitation fluctuations (e.g. deserts and savannas). Nondormancy is associated with stable, warm and wetter climates (e.g. tropical rain forest). Pyroclimate had no significant effect on the distribution of seed dormancy. The environmental drivers considered in this study had a comparatively low predictive power, suggesting that macroclimate is just one of several global drivers of seed dormancy.
种子休眠最大限度地增加了在环境适宜性随时间变化的生境中幼苗建立的植物繁殖。然而，我们仍然缺乏对非休眠和不同类型种子休眠（生理休眠、形态生理休眠和物理休眠）的宏观生态驱动因素的综合综合。我们研究了全球种子休眠变异的当前地理格局和环境相关性。我们结合了>10000 种物种的种子休眠类别的最新数据集，以及>400 万个具有全球所有生物群落的地理参考物种发生点，检验了这种分布是如何由气候和火灾模式驱动的。种子休眠在季节性寒冷和干燥的气候中很普遍。生理休眠发生在温度季节性较高的相对干燥气候中（例如温带草原）。形态生理休眠在以森林为主的寒冷生物群落中更为常见，那里的降水相对较高且分布均匀。物理休眠与温度和降水季节性波动较大的干燥气候有关（例如沙漠和稀树草原）。无休眠与稳定、温暖和湿润的气候有关（例如热带雨林）。火气候对种子休眠分布没有显著影响。本研究中考虑的环境驱动因素的预测能力相对较低，这表明大气候只是种子休眠的几个全球驱动因素之一。
