Regeneration of Robiniapseudoacacia riparian forests after clear-cutting along the Chikumagawa River in Japan |
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Authors: | Hiroyuki Kurokochi Keisuke Toyama Taizo Hogetsu |
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Affiliation: | (1) Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan |
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Abstract: | Regeneration processes of riparian Robinia pseudoacacia forests after clear-cutting were investigated through dendroecological and microsatellite polymorphism analyses. Age determination of regenerated R. pseudoacacia trees based on the dendroecological analysis revealed that forests regenerating after clear-cutting were composed of trees that mostly established within a few years after clear-cutting. This suggests that the stimulus to form new shoots was evoked by clear-cutting but faded within a few years. Genet identification via the microsatellite polymorphism analysis showed that ramet trees belonging to the same genet were distributed in a cluster. Almost all trees regenerated asexually through new ramet formation on the cut stumps and residual horizontal roots after clear-cutting. AMOVA with microsatellite markers showed that among- and within-population variations contributed 6 and 94% to the total variation, respectively, suggesting that R. pseudoacacia trees in the forests were initially established from seeds dispersed randomly from mother trees in a wide area. |
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