Establishment, expansion and adaptive characteristics of an invasive tree (Bischofia javanica) in Pacific islands.

本研究的目的是评估草甘膦除草剂清除爪哇小蠊后，入侵树种爪哇小蠊重新恢复的风险。杀上树2年后，爪哇木的出苗率下降到接近0。因此，至少在清除上层树木2年后，清除新出现的爪哇木幼苗是很重要的。原生树种的出苗率要低得多。入侵鼠的破坏可能是制约幼苗数量的因素之一。在杀死爪哇木后，爪哇木的种子通过鸟类传播，落入种子陷阱。在距离最近的母树70m范围内设置的陷阱中，种子复入率较高。杀死爪哇木的繁殖树并不会增加本地树木的出苗和生长，反而会提高爪哇木本身的成苗率和其他外来树木的繁殖成功率。为了保护原生林，不仅要杀死爪哇木，而且要同时杀死其他外来树种。

Aim of this study was to evaluate the risk of re-establishment of invasive tree Bischofia javanica after eliminating the B.javanica using glyphosate herbicide. Seedling emergence ratio of B.javanica was decreased nearly zero 2 years after killing the upper trees. So it is important to remove emerged B.javanica seedlings at least 2 years after the elimination of upper trees. Seedling emergence was much lower for native trees. and damage by invasive rodent Rattus rattus may be the one factor of restricting the number of seedlings. After killing the B.javanica trees, seeds of B.javanica was dispersed by birds and fall into the seeds traps. The rate of seeds re-entering was high in the traps located within 70m from nearest mother tree. To kill reproductive trees of B.javanica not contribute to increase emergence and growth of native trees, rather enhance the seedling establishment of B.javanica itself and reproductive success of other alien trees. To conserve native forest, it is nesesary to kill not only B.javanica but also other alien trees at one time.