Long-Term Persistence of Pioneer Species in Tropical Rain Forest Soil Seed Banks
Long-Term Persistence of Pioneer Species in Tropical Rain Forest Soil Seed Banks
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DOI：
10.1086/597221
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发表时间：
2009-04-01
影响因子：
2.9
通讯作者：
Brown, Thomas A.
中科院分区：
文献类型：
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作者：
Dalling, James W.;Brown, Thomas A.
在热带森林中，先锋树种的再生种子直接分散到树冠间隙，并从种子，坚持在土壤种子库间隙形成之前。生活史模型表明，选择的长期持久性的树木种子在土壤中应该是弱的，因为持久性可能会降低人口增长率，延长世代时间，因为成年人的寿命可能会超过有利的招聘网站的返回间隔。在这里，我们使用加速器质谱的碳年代种子的三个先锋树种提取不受干扰的种子库在季节性潮湿的低地新热带森林。我们发现，种子巴豆billbergianus，山黄麻，花椒成功发芽后38，31和18年，分别从表层土壤微网站。数十年之久的持久性可能是常见的大种子热带先锋，似乎是无关的具体再生要求。
In tropical forests, pioneer tree species regenerate from seeds dispersed directly into canopy gaps and from seeds that persisted in soil seed banks before gap formation. Life-history models have suggested that selection for the long-term persistence of tree seeds in the soil should be weak because persistence potentially reduces population growth rate by extending generation time and because adult life spans may exceed the return interval of favorable recruitment sites. Here we use accelerator mass spectrometry to carbon-date seeds of three pioneer tree species extracted from undisturbed seed banks in seasonally moist lowland Neotropical forest. We show that seeds of Croton billbergianus, Trema micrantha, and Zanthoxylum ekmannii germinate successfully from surface soil microsites after 38, 31, and 18 years, respectively. Decades-long persistence may be common in large-seeded tropical pioneers and appears to be unrelated to specific regeneration requirements.