渗漏
发表于 2025-3-21 19:14:59
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CONE
发表于 2025-3-21 23:46:35
Predispersal hazards, that only 2.5% of the ovules survive the predispersal phase. The period between ovule formation and seed ripening can be one of the most hazardous in the plant’s life cycle. Demographic studies of plants tend to ignore this predispersal phase, and little is known of the selective pressures to which
cuticle
发表于 2025-3-22 03:34:12
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FORGO
发表于 2025-3-22 08:25:48
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骄傲
发表于 2025-3-22 10:59:25
Dormancy,Dormancy is a delaying mechanism which prevents germination under conditions which might prove to be unsuitable for establishment. As long as the seed remains viable the possibility exists that it may eventually find itself more favourably placed.
LARK
发表于 2025-3-22 16:41:49
Germination,ey encounter the appropriate environmental cues. Each species has its own characteristic set of germination requirements. The responses shown by seeds to the great variety of conditions to which they are subjected can be regarded as adaptations for maximizing the likelihood of surviving in a patchy
conference
发表于 2025-3-22 20:09:17
Seedling establishment,e growth of the shoot and root proceeds, dependence on internal resources is gradually reduced and external supplies of carbon and minerals are exploited. A seedling is considered to be fully established when it has become effectively independent of its seed reserves. It is probable that in many cas
积云
发表于 2025-3-22 21:28:45
Regeneration and diversity,eliminating the less competitive ones. The study of the ecological aspects of regeneration has contributed substantially to our understanding of (a) how species diversity is maintained in plant communities; (b) the origin of the distribution patterns of individual species, and (c) the causes of diff
动机
发表于 2025-3-23 02:53:50
Seedling establishment,jays in early summer without apparent harm to the young plants (Bossema, 1979). In the durian (.), a heavy-seeded tropical tree, the large fleshy cotyledons are shed shortly after germination, yielding no apparent advantage to the seedling. A small minority of other rainforest trees share this characteristic (Ng, 1978).
有权威
发表于 2025-3-23 06:23:51
Predispersal hazards, ripening ovules are subjected. From the point of view of the population geneticist, the differential survival of a particular combination of genes is of importance, regardless of the stage in the life cycle at which it occurs.