RELATIONSHIPS BETWEEN SEED FATES AND SEEDLING ESTABLISHMENT IN AN ALPINE ECOSYSTEM
RELATIONSHIPS BETWEEN SEED FATES AND SEEDLING ESTABLISHMENT IN AN ALPINE ECOSYSTEM
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DOI：
10.2307/1941687
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发表时间：
1995-10-01
期刊：
影响因子：
4.8
通讯作者：
CHAMBERS, JC
中科院分区：
文献类型：
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作者：
CHAMBERS, JC
在裸露土壤上，土壤表面特征与种子形态特征之间的关系往往决定种子被截留的微观位置和影响幼苗建立的模式。我研究了种子和幼苗命运的高山物种不同形态的范围内的统一和混合颗粒大小的土壤上Beartooth高原，蒙大拿州。种子和表层土壤之间的物理关系决定了在潜在出苗区（0-1厘米深）内的截留和保留。种子大小（长度或质量），存在或不存在专门的附属物或种皮，和附属物或种皮的性质影响的数量被困的种子和种子分布的颗粒大小。顺毛，吸湿性芒，帕普斯，和粘液种皮都导致了较高的包封在粒径范围内。不同的种子形态的有效性降低了长期暴露（1年）的环境。与种子的截留和保留相反，幼苗的出苗和存活取决于不同粒径土壤满足物种生物学要求的能力。虽然一些幼苗出现在粒径范围从
On exposed soils relationships between soil surface characteristics and seed morphological attributes often determine the microsites of seed entrapment and influence patterns of seedling establishment. I examined seed and seedling fates of alpine species with varying morphology over a range of uniform- and mixed-particle-size soils on the Beartooth Plateau, Montana. Physical relationships between seeds and surface soils determined entrapment and retention within the zone of potential emergence (0-1 cm depth). Seed size (length or mass), the presence or absence of specialized appendages or seed coats, and the nature of the appendage or seed coat influenced numbers of seeds trapped and seed distributions among the particle sizes. Antrorse hairs, hygroscopic awns, pappuses, and mucilaginous seed coats all resulted in higher entrapment over the range of particle sizes. The effectiveness of different seed morphologies was decreased by prolonged exposure (1 yr) to the environment. In contrast to seed entrapment and retention, seedling emergence and survival depended on the ability of the different particle-size soils to meet the biological requirements of the species. Although some seedling emergence occurred in particle sizes that ranged from