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Cambial growth dynamics and climatic control of different tree life forms in tropical mountain forest in Ethiopia

机译:埃塞俄比亚热带山地森林的林类生长动态和不同树种的气候控制

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摘要

Munessa Forest is a mountain forest in south-eastern Ethiopia experiencing seasonal rainfall variation. We investigated seasonal cambial activity and dormancy from increment rates of four different tree species belonging to varying life forms, namely, evergreen native conifer (Podocarpus falcatus), evergreen introduced conifer (Pinus patula), evergreen broadleaved tree (Prunus africana) and deciduous broadleaved tree (Celtis africana). Measurements of stem radius fluctuations were registered with the help of high-resolution electronic dendrometers. Daily amplitudes of stem diameter variations and daily and monthly net growth rates were determined and related to climatic variables measured at local climate stations. Thin sections of wood collected with a microcorer every 3–6 weeks allowed a visual control of newly formed wood cells during consecutive time intervals. Lack of water availability during the long dry season induced cambial dormancy of 5–7 months depending on life forms. After the onset of the short rainy season, stem swelling started quite synchronously with a variation of only single days in all studied species. Evergreen tree species were able to initiate wood formation during the short rainy season, whereas growth in the deciduous broadleaved species started in the long rainy season. The acquired data provide a basis for delineating the species-specific growth boundaries and the duration of the cambial growing season.
机译:穆妮莎森林(Munessa Forest)是埃塞俄比亚东南部的山区森林,经历季节性降雨变化。我们从属于不同生命形式的四种不同树种的增生率调查了季节性的冈比亚活动和休眠状态,这些树种是常绿原生针叶树(Podocarpus falcatus),常绿引入针叶树(Pinus patula),常绿阔叶树(Prunus africana)和落叶阔叶树(Celtis africana)。借助高分辨率的电子密度计记录了杆半径波动的测量值。确定茎日径变化的每日幅度以及每日和每月的净增长率,并将其与在当地气候站测量的气候变量相关。每隔3-6周用微芯收集的木材薄片可以在连续的时间间隔内目视控制新形成的木质细胞。在干旱的长季节缺乏水会导致5-7个月的冈比亚休眠,具体取决于生命形式。在短暂的雨季开始后,所有研究物种的茎肿胀都开始同步,只有一天的变化。常绿树种能够在短雨季开始形成木材,而落叶阔叶树种的生长始于长雨季。所获得的数据为描述特定物种的生长边界和冈比亚生长期的持续时间提供了基础。

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