Growth trajectories and ages of main tree species in dry Afromontane forest fragments of northern Ethiopia

被引:1
|
作者
Siyum, Zenebe Girmay [1 ,2 ]
Ayoade, J. O. [3 ]
Onilude, M. A. [4 ]
Feyissa, Motuma Tolera [2 ]
机构
[1] Univ Ibadan, Pan African Univ, Life & Earth Sci Including Hlth & Agr Inst, Ibadan, Nigeria
[2] Hawassa Univ, Wondo Genet Coll Forestry & Nat Resource, POB 128, Shashemene, Ethiopia
[3] Univ Ibadan, Dept Geog, Ibadan, Nigeria
[4] Univ Ibadan, Dept Agr & Environm Engn, Ibadan, Nigeria
来源
SN APPLIED SCIENCES | 2019年 / 1卷 / 07期
关键词
Dendrochronology; Dry Afromontane forest; Radial growth; Tree age; LONG-TERM GROWTH; RADIAL-GROWTH; PTEROCARPUS-ANGOLENSIS; CANOPY RECRUITMENT; JUNIPERUS-PROCERA; RAIN-FOREST; PATTERNS; RINGS; DYNAMICS; DENDROCHRONOLOGY;
D O I
10.1007/s42452-019-0803-y
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Information on long-term growth rates, ages, and survival of dominant tree species is vital to understand forest dynamics. In this study, tree-ring analysis was used to reconstruct lifetime growth patterns and to examine age-diameter relationships of selected tree species from the dry Afromontane forest fragments in northern Ethiopia. Ring width measurements were based on increment core samples and stem discs collected from three tree species (Juniperus procera, Olea europaea subsp. cuspidata, and Podocarpus falcatus). Standard dendrochronological methods were used for data collection and analysis. Overall, across species and sites, significant mean radial growth differences were found. P. falcatus trees showed the highest mean annual radial growth (2.45 mm/year), while O. europaea trees showed slow growth rates, with average annual growth ranging between 1.6 mm in Desa'a and 2.0 mm in Hugumburda. The mean ring width of an individual J. procera tree ranged between 1.8 mm/year (in Desa'a site) and 2.3 mm/year (in Hugumburda site). Many trees of the sampled species exhibited more or less sigmoid growth curves. Age variation is mainly determined by the variation in passage time through the smaller diameter classes (juvenile classes). In general, the results obtained in this study have important implications for understanding growth dynamics of tropical dry Afromontane forests and for planning conservation and restoration activities. This study has to be supported by eco-physiological studies to further understand the responses of these and related main tree species to the varied environmental gradients to better explain the dynamics in relation to emerging environmental changes.
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页数:17
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