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首页> 外文期刊>The Journal of Ecology >Causes and consequences of prolonged dormancy for an iteroparous geophyte, Silene spaldingii
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Causes and consequences of prolonged dormancy for an iteroparous geophyte, Silene spaldingii

机译：硅质藻类植物Silend spaldingii长时间休眠的原因和后果

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1. Prolonged dormancy, during which a plant does not produce above-ground shoots during one or more growing seasons, is common in temperate herbaceous species, but its role in life history is poorly understood. 2. We analysed stage transitions to determine the consequences of prolonged dormancy for Silene spaldingii, a perennial geophyte of semi-arid grasslands in the Columbia Basin of western North America. We monitored 179 S. spaldingii plants from 1987 through 2005, and analysed demographic rates as a function of plant state and seasonal precipitation. 3. Dormant plants had similar survival and growth to vegetative plants, and were more likely to flower in the following year, resulting in a greater reproductive value being associated with the dormant state. Thus, prolonged dormancy is likely to increase fitness in S. spaldingii. 4. Both external (precipitation) and internal (stage in previous year) factors were associated with S. spaldingii vital rates. Prolonged dormancy was more likely following flowering than after being vegetative, and following a wetter summer and/or drier fall the previous year. 5. Our results suggest that geophytic species may respond to current resource availability in a manner dependent on internal state (previous performance) and suggest that prolonged dormancy plays a role in resource allocation and life history.
机译：1.长期休眠是植物在一个或多个生长季节中不产生地上芽的现象，这种现象在温带草种中很常见，但人们对其生命史的作用了解甚少。 2.我们分析了阶段过渡，以确定长期休眠对北美西部哥伦比亚盆地半干旱草原多年生地球植物Silene spaldingii的影响。从1987年到2005年，我们监测了179株S. spaldingii植物，并分析了人口变化率与植物状态和季节性降水的关系。 3.休眠植物的存活和生长与无性植物相似，并且在第二年更可能开花，从而导致与休眠状态相关的更高的繁殖价值。因此，长时间的休眠可能会增加S. spaldingii的适应性。 4.外部因素（降水）和内部因素（上一年度的阶段）均与S. spaldingii生命率相关。开花后比植物生长后，以及上一年夏天和/或秋天干燥后，长期休眠的可能性更高。 5.我们的结果表明，地理上的物种可能以依赖于内部状态（先前的表现）的方式对当前资源的可用性做出响应，并表明长期休眠在资源分配和生活史中起作用。

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