Crossdating Juniperus procera from North Gondar, Ethiopia

Wils, Tommy H. G.; Robertson, Iain; Eshetu, Zewdu; Touchan, Ramzi; Sass‐Klaassen, Ute; Koprowski, Marcin

doi:10.1007/s00468-010-0475-0

Cited by 30 publications

(29 citation statements)

References 39 publications

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“…Third, ring widths of trees from a population can be cross-dated, to assess whether synchronous ring formation occurs, which allows relating tree growth to climatic variables (e.g. Wils et al 2010). For various tree species annual ring formation has been shown through correlating growth with rainfall (e.g.…”

Section: Periodicity In Tree Growth and Detection Of Tropical Tree Ringsmentioning

confidence: 99%

Dendroecology in the tropics: a review

Rozendaal

Zuidema

2010

Trees

209

121

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Over the last decade the field of tropical dendroecology has developed rapidly and major achievements have been made. We reviewed the advances in three main themes within the field. First, long chronologies for tropical tree species were constructed which allowed climate reconstructions, revealed sources of climatic variation and clarified climate-growth relations. Other studies combined tree-ring data and stable isotope ( 13 C and 18 O) measurements to evaluate the response of tropical trees to climatic variation and changes. A second set of studies assessed long-term growth patterns of individual trees throughout their life. These studies enhanced the understanding of growth trajectories to the canopy, quantified autocorrelated tree growth and yielded new estimates of tree ages. Such studies were also used to reconstruct the disturbance history of tropical forests. The last set of studies applied tree-ring data to growth models. Tree-ring data can replace diameter measurements from research plots, provide additional information to construct population models, improve timber yield models and validate model output. Based on our review, we propose two main directions for future research.(1) An evaluation of the causes and consequences of growth variation within and among trees and their relation to environmental variation. Studies evaluating this directly contribute to improved understanding of tropical tree ecology. (2) The simultaneous measurement of widths and stable isotope fractions in tree rings offers the potential to study responses of trees to climatic change. Given the major role of tropical forests in the global carbon cycle, knowing these responses is of high priority.

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Section: Periodicity In Tree Growth and Detection Of Tropical Tree Ringsmentioning

confidence: 99%

Dendroecology in the tropics: a review

Rozendaal

Zuidema

2010

Trees

209

121

View full text Add to dashboard Cite

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“…It has been shown that crossdating alone cannot prove the annual nature of tree rings if the correlation between the ring width series is low ). Crossdating tends to be particularly difficult in young trees due to weak ring distinctness and in old trees, due to frequent occurrence of false and partial rings (Wils et al 2010a).…”

Section: Dendrochronology Outside Temperate and Boreal Regionsmentioning

confidence: 99%

“…Gebrekirstos et al (2008Gebrekirstos et al ( , 2009) sampled trees at site R. Eshete and Ståhl (1999) sampled trees at four sites (Alagae, Ziway and Awasa plantations, and Langano woodlands) between sites R and V. Couralet (2004), Couralet et al (2005Couralet et al ( , 2007 and Sass-Klaassen et al (2008a) sampled trees of known age at site V and trees of unknown age at sites G and O. Conway et al (1997Conway et al ( , 1998) sampled trees at sites G, S and T. Wils (2007Wils ( , 2009), Wils and Eshetu (2007) and Wils et al (2008Wils et al ( , 2009Wils et al ( , 2010a In the highlands of Ethiopia, exploratory expeditions by Briffa and Russell-Smith (1986) and Conway et al (1997Conway et al ( , 1998 identified Ekebergia capensis Sparrm. and particularly Juniperus procera Hochst.…”

Section: Lowlandsmentioning

confidence: 99%

“…ex Endlicher as potential candidates for dendrochronology. Subsequent research has been focused on Juniperus procera, though Wils and Eshetu (2007) (Conway et al 1997(Conway et al , 1998Couralet 2004;Couralet et al 2005Couralet et al , 2007Sass-Klaassen et al 2008a (Wils 2007(Wils , 2009Wils and Eshetu 2007;Wils et al 2008Wils et al , 2009Wils et al , 2010a, Hugumburda forest (H) , Lalibela forest (L) (Z. Eshetu, not published) and Fasiledes bath (F) (M. Koprowski, not published).…”

Section: Lowlandsmentioning

confidence: 99%

“…Growth rings have been identified at all sites, but could only be crossdated successfully at sites G, O, V (stem discs) (Couralet et al 2005(Couralet et al , 2007, M, E, W, K and B (cores) (Wils et al 2010a). The annual nature of the growth rings was confirmed by ring counting in plantation trees [site V (Couralet et al 2005(Couralet et al , 2007] or AMS radiocarbon dating (Wils et al 2010b).…”

Section: Lowlandsmentioning

confidence: 99%

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Dendrochronology in the dry tropics: the Ethiopian case

Wils

Sass‐Klaassen

Eshetu

et al. 2010

Trees

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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 subSaharan 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 Trees DOI 10.1007/s00468-010-0521-y 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.

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Nonannual tree rings in a climate‐sensitive Prioria copaifera chronology in the Atrato River, Colombia

Herrera‐Ramírez

Andreu‐Hayles

Valle

et al. 2017

Ecology and Evolution

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In temperate climates, tree growth dormancy usually ensures the annual nature of tree rings, but in tropical environments, determination of annual periodicity can be more complex. The purposes of the work are as follows: (1) to generate a reliable tree‐ring width chronology for Prioria copaifera Griseb. (Leguminoceae), a tropical tree species dwelling in the Atrato River floodplains, Colombia; (2) to assess the climate signal recorded by the tree‐ring records; and (3) to validate the annual periodicity of the tree rings using independent methods. We used standard dendrochronological procedures to generate the P. copaifera tree‐ring chronology. We used Pearson correlations to evaluate the relationship of the chronology with the meteorological records, climate regional indices, and gridded precipitation/sea surface temperature products. We also evaluated 24 high‐precision 14C measurements spread over a range of preselected tree rings, with assigned calendar years by dendrochronological techniques, before and after the bomb spike in order to validate the annual nature of the tree rings. The tree‐ring width chronology was statistically reliable, and it correlated significantly with local records of annual and October–December (OND) streamflow and precipitation across the upper river watershed (positive), and OND temperature (negative). It was also significantly related to the Oceanic Niño Index, Pacific Decadal Oscillation, and the Southern Oscillation Index, as well as sea surface temperatures over the Caribbean and the Pacific region. However, 14C high‐precision measurements over the tree rings demonstrated offsets of up to 40 years that indicate that P. copaifera can produce more than one ring in certain years. Results derived from the strongest climate–growth relationship during the most recent years of the record suggest that the climatic signal reported may be due to the presence of annual rings in some of those trees in recent years. Our study alerts about the risk of applying dendrochronology in species with challenging anatomical features defining tree rings, commonly found in the tropics, without an independent validation of annual periodicity of tree rings. High‐precision 14C measurements in multiple trees are a useful method to validate the identification of annual tree rings.

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Crossdating Juniperus procera from North Gondar, Ethiopia

Cited by 30 publications

References 39 publications

Dendroecology in the tropics: a review

Dendroecology in the tropics: a review

Dendrochronology in the dry tropics: the Ethiopian case

Nonannual tree rings in a climate‐sensitive Prioria copaifera chronology in the Atrato River, Colombia

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