Importance of seed size for the establishment of seedlings of five deciduous broad-leaved tree species

被引:129
作者
Seiwa, K [1 ]
Kikuzawa, K [1 ]
机构
[1] KYOTO UNIV, FAC SCI, CTR ECOL RES, KYOTO, JAPAN
来源
VEGETATIO | 1996年 / 123卷 / 01期
关键词
gap size; leaf dynamics; litter accumulation; seasonal changes in light conditions; seedling emergence; seedling survival;
D O I
10.1007/BF00044887
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Effects of seed size and phenology on the establishment of five deciduous broad-leaved tree species were examined in deciduous woodland. Treatments included absence and presence of litter in the forest understory, a small gap, and a large gap. Seedling emergence of large-seeded species Quercus mongolica var. grosseserrata and Acer mono was not reduced by accumulation of litter in the forest understory, but was promoted in the large gap where litter was less. Seedling emergence of small-seeded species, Alnus hirsuta, Cercidiphyllum japonicum and Betula platyphylla var. japonica, was reduced by the litter in almost all of the sites. Seedlings of large-seeded species avoid shade stress phenologically by unfolding all of their large leaves in a short period before canopy closure in the forest understory. These species had little mortality after seedling emergence. In contrast, small-seeded species have a longer duration of leaf emergence, shorter leaf longevity, and rapid leaf turnover in all the sites. These seedlings attained similar height to those of the large-seeded species at the end of the second year in the large gap, but survival and height growth rate decreased after canopy closure in the forest understory. We suggest that the importance of seed size in determining seedling establishment largely depends on the relationships between seasonal changes of environmental conditions and phenological traits of seedlings, which are related to seed size.
引用
收藏
页码:51 / 64
页数:14
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