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Ecological roles of stem sprouts and creeping sprouts ofAucuba japonica Thunb. |
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| Authors: | Keitaro Ito Satoshi Ito Koichiro Gyokusen Akira Saito |
| Affiliation: | (1) Laboratory of Silviculture, Faculty of Agriculture, Kyushu University, 812-8581 Fukuoka, Japan;(2) Forest Science Division, Faculty of Agriculture, Miyazaki University, 889-2192 Miyazaki, Japan;(3) Present address: Department of Civil Engineering, Faculty of Engineering, Kyushu Institute of Technology, 804-8550 Kitakyushu, Japan |
| Abstract: | The ecological roles of stem sprouts and creeping sprouts ofAucuba japonica Thunb. were investigated through comparisons of the population structure at individual and stem level between two sites with different disturbance histories. Age and size structure of individuals indicated fewer chances for establishment of new individuals in undisturbed population. Maintenance of population was achieved by stem replacement within a clump and vegetative propagation with creeping sprouts which adapted to the non-severe disturbances. Rapid recovery by vigorous sprouting and encouraged seedling recruitment were detected in the disturbed sites. Results of the stem level analysis suggested transformation of stem sprouts into creeping sprouts. The major role of stem sprouts shifted from the maintenance of individuals to recovery of individuals by a severe disturbance. These differentiation of ecological roles among stem types, and their flexible changes according to disturbance regimes were thought to be the reasons whyA. japonica can achieve both the rapid dominance in a disturbed stand and the stable population in a less disturbed stand. |
| Keywords: | Accuba japonica disturbance population structure regeneration types spatial expansion |
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