ABSTRACT

Ethiopian mixed forests have multipurpose benefits and services. However, there is a gap of information in the entire Ethiopian highlands on forest growth needed for implementation of sustainable forest management and provision of ecosystem services. Therefore, main aim of this study was to identify main factors deriving tree growth in forest and woodland in Amhara Regional State of Ethiopia and to provide an individual tree basal area increment (BAI) model based on increment cores. The data came from 170 sampling plots in study area and cover 51 tree species. For each tree species, diameter at breast height (DBH), height, increment core measurement, tree location, and distance from subject tree measurements were recorded. Because of large number of trees species, it is difficult to develop growth functions for each individual tree species. Thus, classification of species groups provided a framework to organize information that differs between vegetation types. Our classification resulted in three groups. For each tree species group, an individual tree BAI model was calibrated. The tree species group of BAI differs by DBH class. The response to BAI depends on competitive condition of a tree. This growth model can be used to predict tree growth for Ethiopian mixed-species forests.

摘要

埃塞俄比亚混交林具有多种用途和服务。然而，在整个埃塞俄比亚高地，关于实施可持续森林管理和提供生态系统服务所需的森林增长的信息存在差距。因此，本研究的主要目的是确定导致埃塞俄比亚阿姆哈拉州森林和林地树木生长的主要因素，并提供基于增量核心的个体树木断面面积增量 (BAI) 模型。数据来自研究区170个样地，涵盖51个树种。对于每个树种，记录了胸径 (DBH)、高度、增量核心测量值、树木位置以及与主题树测量值的距离。由于树种众多，很难开发出每个树种的生长功能。因此，物种组的分类提供了一个框架来组织植被类型之间不同的信息。我们的分类结果分为三组。对于每个树种组，校准了一个单独的树 BAI 模型。BAI的树种组因胸径级而异。对 BAI 的反应取决于树的竞争条件。该生长模型可用于预测埃塞俄比亚混交林的树木生长。