The role of seed dispersal and seedling traits in colonization and coexistence ofSalix species in a seasonally flooded habitat
The role of seed dispersal and seedling traits in colonization and coexistence ofSalix species in a seasonally flooded habitat
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种子传播和幼苗性状在季节性洪水栖息地中柳属定植和共存中的作用
DOI：
10.1007/bf02347007
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发表时间：
1990
影响因子：
2
通讯作者：
K. Niiyama
中科院分区：
文献类型：
--
作者：
K. Niiyama
在日本北海道中部的Sorachi河漫滩上，研究了6种共生柳属植物的更新特征，并讨论了它们在当地栖息地的殖民成功和共存。混合群落含有6种柳属植物；主导:S。sachalinensis;四个下属:S。罗里达、佩特苏苏、米雅比纳和。subfragilis;稀有物种:S。jessoensis。研究了它们的物候、种子的下落速度和寿命，以及微地形和土壤质地对幼苗形成的影响。六种柳属植物的种子传播周期重叠，与可预测的春洪后水位下降相吻合。这种巧合对殖民化的成功至关重要，因为幼苗是在水位下降留下的潮湿土壤上生长的。它们表现出专门化和一般化两种再生特征。rorida and。亚脆弱株表现出对比鲜明的再生特征；种子传播早、晚、种子大、种子小、种子在粗、细土壤上的分布。这两个物种很少同时发生。另一方面，支配者。Sachalinensis种子大小和传播时间适中，幼苗分布范围广，从粗土到细土都有。结果表明，洪水季节影响了柳树的定植成功和更新特性，与洪水季节和土壤异质性相关的更新生态位分离主要促进了柳树的共存。
Regeneration traits of six co-occurringSalix species were studied on a floodplain of the Sorachi River, central Hokkaido, Japan, and their colonization success and coexistence in a local habitat were discussed. MixedSalix communities contained sixSalix species; dominant:S. sachalinensis; four subordinates:S. rorida, S. pet-susu, S. miyabeana andS. subfragilis; rare species:S. jessoensis. Their phenology, falling velocity and longevity of seeds, and the effects of microtopography and soil texture on seedling establishment were studied. The sixSalix species had overlapped seed dispersal periods that coincided with the decrease of water level after a predictable spring flood. This coincidence was crucial for the colonization success because the seedlings were established on wet soils left by the decreasing water level. They showed two types of regeneration trait, specialization and generalization.S. rorida andS. subfragilis showed contrasting regeneration traits; early vs. late seed dispersal, large vs. small seeds, seedling distribution on coarse vs. fine soils, respectively. These two species rarely co-occurred. On the other hand, the dominantS. sachalinensis had an intermediate seed size and dispersal timing, and a wide range of seedling distribution from coarse to fine soils. These results revealed that flooding seasonality influenced the colonization success together with the regeneration traits ofSalix species, and that coexistence of theSalix species was facilitated primarily by regeneration niche separation related to flooding seasonality and soil heterogeneity.