サクラバハンノキの萌芽特性および集団の動態

概要

論文の詳細を見る
Sprouting charahteristics and population dynamics of Alnus trabeeulosa To obtain information required to conserve the "near threatened" species Alnus trabeculosa we investigated sprouting characteristics and population dynamics of a sub population of the species in Juo, central Japan. The data obtained were compared with corresponding data for A.japonica, which is not threatened. A.trabeculosa had a higher proportion of multiple stemmed individuals, which had a greater mean number of stems. It also had a larger percentage of individuals with sprouts, and a higher mean number of sprouts per individual, indicating that it has a relatively high capacity for sprouting. Population monitoring showed that no new individuals were recruited into the Juo sub population over the six year study period (1995-2001), and the survival ratio was 86%. Stems of some individuals died during this period, but some produced sprouts from their roots. Sprouting in A.trabeculosa seems to prolong the lifespan of individuals and provides a means of distributing clones from mother trees. A.trabeculosa can likely survive in swampy places, as there are relatively few competitors. Moreover, resprouting is considered to have many advantages for this species if there is relatively little disturbance. Therefore conservation of this kind of habitat should be beneficial for conservation of the species.
2003-04-30