Seedling emergence patterns and dormancy/germination physiology of Primula modesta in a subalpine region
Seedling emergence patterns and dormancy/germination physiology of Primula modesta in a subalpine region
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DOI：
10.1111/j.1440-1703.2004.00667.x
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发表时间：
2004-09-01
影响因子：
2
通讯作者：
Washitani, I
中科院分区：
文献类型：
--
作者：
Shimono, A;Washitani, I
根据种子萌发/休眠对温度、光照和局部种子降雨的反应，对报春花(报春花科)在亚高山地区两种不同生境下的出苗规律进行了研究。阿萨玛：一种营养稀少的平坦沼泽和草本植物覆盖较密的草原。室内萌发试验揭示的休眠/萌发生理特征很好地解释了出苗的季节规律。这些种子即使在经历了潮湿的低温后，也有严格的光照要求，这可能有助于种子进入土壤种子库。尽管种子产量充足，但草场和沼泽地的出苗数量远低于沼泽地，但出苗数量主要取决于前一季的种子雨量和两个地点微型场地的枯落物盖度。因此，种子雨和萌发安全地点的时空格局可以很好地解释该生境出苗的时空格局。
On the basis of the germination/dormancy responses of seeds to temperature and light, and local seed rain, we attempted to interpret the seedling emergence patterns of Primula modesta Bisset et Moore (Primulaceae) in two different types of habitats in a subalpine zone of Mt. Asama: an oligotrophic flat moor and a grassland with relatively dense herbaceous vegetation cover. The seasonal pattern of seedling emergence was well explained by the dormancy/germination physiology revealed in laboratory germination tests. The seeds were demonstrated to have a strict light requirement even after experiencing moist chilling, which might facilitate the incorporation of the seeds into the soil seed bank. Despite sufficient seed production, the seedlings emerging were far less at the grassy site than the moor site, but the number of seedlings was significantly dependent on the seed rain within previous season and on the litter cover of the microsite in both sites. Therefore, the spatiotemporal patterns of seedling emergence in the habitats could be well explained by the spatiotemporal patterns of seed rain and safe-sites for germination.