Establishment of alluvial forest species in floodplains: the role of dispersal timing, germination characteristics and water level fluctuations
Establishment of alluvial forest species in floodplains: the role of dispersal timing, germination characteristics and water level fluctuations
复制标题
洪泛区冲积林物种的建立：扩散时间、发芽特征和水位波动的作用
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
C. Blom
中科院分区：
文献类型：
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作者：
I. V. Splunder;H. Coops;L. Voesenek;C. Blom
摘要
对荷兰瓦尔河沿岸的四种漫滩森林树种（白柳、柳树、柳树和黑杨）的幼苗进行了研究。在田间条件下研究了种子发芽模式和种子传播的时间。在实验室实验中研究了温度和基质水分含量对种子发芽率和活力的影响。春季，沿着瓦尔河，种子传播的顺序如下：S. viminalis、S. triandra、S. alba 和 P. nigra。种子在与河流平行的狭窄地带发芽； S. viminalis 幼苗的海拔高度高于 S. alba 幼苗。对于柳属植物，河岸幼苗的海拔高度与传播期间的水位有关，但对于黑杨则没有。
温度在5-25℃范围内对发芽率没有影响。黑杨的种子活力比柳属物种明显更长，并且在较低的土壤湿度下发芽。田间观察到的幼苗分区可以通过物种的发芽反应来解释；种子传播的时间和水位波动似乎是最初洪泛区森林分区的主要决定因素。
SUMMARY
The establishment of seedlings of four floodplain forest species (Salix alba, S. triandra, S. viminalis and Populus nigra) on river banks along the River Waal, the Netherlands, was studied. Seed germination patterns and timing of seed dispersal were studied under field conditions. Effects of temperature and substrate moisture content on germination percentages and the viability of the seeds were investigated in a laboratory experiment. Along the River Waal, seed dispersal occurred in spring in the following sequence: S. viminalis, S. triandra, S. alba and P. nigra. Seeds germinated in narrow belts parallel to the river; seedlings of S. viminalis were found at a higher elevation than S. alba seedlings. The elevation of the seedlings on the river bank was related to the water level during the dissemination period for Salix spp., but not for P. nigra.
Temperature had no effect on germination percentage within the range of 5–25°C. P. nigra showed a significantly longer seed viability than the Salix species and germinated at a lower soil moisture content. The zonation of seedlings observed in the field could be explained by the germination responses of the species; timing of seed dispersal and water level fluctuation appeared to be the major determinants of initial floodplain forest zonation.