Climatic fluctuations trigger false ring occurrence and radial-growth variation in teak (Tectona grandis L.f.)
Kritsadapan Palakit (1-2), Khwanchai Duangsathaporn (2-3) , Somkid Siripatanadilok (4)
iForest - Biogeosciences and Forestry, Volume 9, Issue 2, Pages 286-293 (2015)
doi: https://doi.org/10.3832/ifor1100-008
Published: Sep 28, 2015 - Copyright © 2015 SISEF
Research Articles
Abstract
The objective of this study was to examine the interaction of extreme growth years in teak (Tectona grandis) with climatic conditions of current, antecedent and subsequent years, in order to explain the nature and the effects of climatic variability on teak growth in northeastern Thailand. A 33-year tree-ring index was constructed and extreme growth years during the period 1976-2008 were identified. A superposed epoch analysis (SEA) was used to study the interaction of climatic data and extreme growth years. Extreme growth years were derived from eight wider and seven narrower annual rings identified using the Cropper’s method. Seventeen false rings were detected using the threshold value ≥ 80% of false ring occurrence for all samples in each growth year. False ring occurrence was associated with narrow ring width formation and triggered by increasing maximum and mean temperatures at the beginning of the rainy season (May to August). In the third year after false ring formation, we observed a pattern of wet year occurrence when annual rainfall and relative humidity in September to December were higher than in adjacent years. Moreover, in the sixth year before false ring formation, a wet year was observed when relative humidity in September to December was higher than in adjacent years. Wider ring width index occurring in a particular year was found to be triggered by a decrease in maximum and mean temperatures in May to August of the current year, suggesting that wet years promote teak growth. The third year after the formation of wider rings was characterized by a low annual rainfall. Our results showed that drought years trigger false ring and narrow ring formation, while wet years trigger wide ring formation in teak. A cycle of wet years between the sixth year prior to, and the third year after, the formation of false rings was also observed, as well as the occurrence of drought in the third year since the formation of wide rings. False ring, narrow ring and wide ring occurrences appear to be good indicators of a 3-6 year climate fluctuation pattern, similar to that of the El Niño-Southern Oscillation (ENSO) cycle in this region.
Keywords
Extreme Event, False Ring, Pointer Year, Superposed Epoch Analysis, Teak (Tectona grandis), Tree-ring
Authors’ Info
Authors’ address
Faculty of Environment and Resource Studies, Mahidol University, 73170 Nakhon Pathom (Thailand)
Khwanchai Duangsathaporn
Laboratory of Tropical Dendrochronology (LTD), Department of Forest Management, Faculty of Forestry, Kasetsart University, 10900 Bangkok (Thailand)
Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University, Kasetsart University, 10900 Bangkok (Thailand)
Department of Forest Biology, Faculty of Forestry, Kasetsart University, 10900 Bangkok (Thailand)
Corresponding author
Paper Info
Citation
Palakit K, Duangsathaporn K, Siripatanadilok S (2015). Climatic fluctuations trigger false ring occurrence and radial-growth variation in teak (Tectona grandis L.f.). iForest 9: 286-293. - doi: 10.3832/ifor1100-008
Academic Editor
Paolo Cherubini
Paper history
Received: Aug 07, 2013
Accepted: Apr 28, 2015
First online: Sep 28, 2015
Publication Date: Apr 26, 2016
Publication Time: 5.10 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2015
Open Access
This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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