ヤナギ類の分布拡大方法についての一考察 : 流枝による分布拡大について

概要

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Although willows are generally believed to expand population through seed dispersal, there have been some incidents in which alternative method for expansion was clearly used. In this study, the authors aimed to understand a "seed-free" method of willows reproduction. Observations of two sample populations suggest that willows may reproduce and establish new populations in unoccupied sites through branch propagation, a clonal reproduction process by rooting of deposited branches. As we examined the environmental factors which allowed the new establishments and the vegetation growth, in those sites where accumulated gravel particles were relatively larger had higher number of individuals produced from deposited branches instead of growing from seed. In addition, large branches may have greater chances of survival which may also be an advantage for healthier growth with this type of reproduction. These results suggest that willows may be able to expand populations by branches floated from upstream.
日本雨水資源化システム学会の論文