Cambial growth dynamics and climatic control of different tree life forms in tropical mountain forest in Ethiopia |
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Authors: | Julia Krepkowski Achim Br?uning Aster Gebrekirstos Simone Strobl |
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Institution: | (1) Institute of Geography, Friedrich-Alexander-University Erlangen-Nuremberg, Kochstr. 4/4, 91054 Erlangen, Germany;(2) World Agroforestry Centre, United Nations Avenue, Giggiri Road, P.O. Box 30677-00100, Nairobi, Kenya;(3) Institute of Plant Physiology, University of Bayreuth, Universitaetsstr. 30, 95447 Bayreuth, Germany |
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Abstract: | 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. |
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