NDLI: Dendrochronology in the dry tropics: the Ethiopian case

Content Provider	Springer Nature Link
Author	Wils, T. H. G. Sass Klaassen, U. G. W. Eshetu, Z. Bräuning, A. Gebrekirstos, A. Couralet, C. Robertson, I. Touchan, R. Koprowski, M. Conway, D. Briffa, K. R. Beeckman, H.
Copyright Year	2010
Abstract	Dendrochronology is developing outside temperate and boreal regions. Over the past decade substantial progress has been made in Mediterranean and wet tropical regions. However, research in dry tropical regions, notably those of sub-Saharan Africa, has remained fragmentary. Here, we try to identify the unique challenges and opportunities of dendrochronology in the dry tropics. First, we briefly review the status of dendrochronology outside temperate and boreal regions with an emphasis on sub-Saharan Africa. Subsequently, we focus upon one of those areas where dendrochronology in the dry tropics is at the forefront of scientific advance: Ethiopia. A detailed review of tree ring studies in the lowlands and highlands highlights the complexity of ring formation and made us identify four major types of growth ring expression: anatomically not distinct rings, multiple rings per year, annual rings and multiple missing rings. This complex tree growth behaviour is associated with large-scale variations in precipitation regime (unimodal to multimodal) and relatively small-scale variations in tree sensitivity to water availability. Literature results are used to develop a scheme that can be used to predict differences in growth ring formation along gradients in these two factors. Because of the exceptional growth sensitivity of and the importance of local site conditions (topography, biological factors, etc.) for most trees sampled, those growing at the limits of their ecological amplitude are prone to possess multiple rings per year or multiple missing rings. In such circumstances, site selection should not always take place at the limits of the ecological amplitude of a species, but may sometimes have to be diverted to more mesic environments. Successful studies are now appearing, such as those reporting correlations between tree ring chronologies and Blue Nile river flows.
Starting Page	345
Ending Page	354
Page Count	10
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	25
Issue Number	3
e-ISSN	14322285
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-12-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acacia Juniperus procera Ring formation Tree rings Wood anatomy Plant Physiology Plant Sciences Agriculture Plant Anatomy/Development Forestry Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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