Regeneration in an Ethiopian montane forest with special emphasis on tree biology and nurse-tree functions

在穆内萨-谢沙梅内地区(埃塞俄比亚)，对一些中度干扰的天然林和外来树木种植园的水分关系和选定的本土和外来树木的光合作用进行了调查。这项正在进行的工作是土壤学家、地球植物学家和植物生态生理学家进行的生态系统研究的一部分，目的是为可持续管理穆内萨森林提供科学基础，作为埃塞俄比亚其他半落叶森林的样板。这项工作将在两个工作包中继续进行，其中一个将调查所谓的护理树效应。从意外到达桉树、蓝桉或斑皮松种植园的种子发育而来的本土树木的幼树，在这些护理树的庇护下生长得比在天然森林中要快得多。这种意想不到的护理树效应将在当地树木成功再生的种植园中进行研究。在第二个工作包中，将研究重要本土树种的更新生态学，包括更新模式、更新能力以及在自然和人工情况下的有效更新成功。

In the Munessa-Sheshamene region (Ethiopia) several plots of moderately disturbed natural forest and of exotic tree plantations have been investigated with respect to water relations and photosynthetic capcity of selected indigenous and exotic trees. This ongoing work is part of an ecosystem study conducted by soil scientists, geobotanists and plant ecophysiologists that aims at a scientific basis for a sustainable management of the Munessa forest as a model for other semideciduous forests of Ethiopia. The work shall be continued in two working packages, one of which will investigate the so-called nurse-tree effect. Juveniles of indigenous trees developing from seeds that accidentally arrived in a plantation of Eucalyptus saligna, E. globulus or Pinus patula grow significantly faster under the shelter of these 'nurse-trees' than in a natural forest. This unexpected nurse-tree effect will be studied in plantations with a successful regeneration of indigenous trees. In the second working package, regeneration ecology of important indigenous tree species will be studied, comprising modes of regeneration, regenerative capacity and the effective regeneration success under natural and plantation situations.