Cellulose oxygen isotopic composition of teak (Tectona grandis) collected from Java Island: a tool for dendrochronological and dendroclimatological analysis

Penulis: Ryo Hisamochia,⁎, Yumiko Watanabea, Masaki Sanob, Takeshi Nakatsukac, Naoyuki Kuritad, Miyuki Matsuo-Uedae, Hiroyuki Yamamotoe, Suyako Tazuruf, Junji Sugiyamaf, Bambang Subiyantog, Sri Nugroho Marsoemh, Toshitaka Tsudaf, Takahiro Tagamia

The oxygen isotopic composition (δ18O) of tree-ring cellulose has been recognized as a powerful tool for dendroclimatological and dendrochronological investigations in Asia. Only a few studies of cellulose δ18O so far published, however, have been conducted in Indonesia, and the spatial coherence of celluloseδ18O has yet to be clarified. In this study we measured cellulose δ18O of teak (Tectona grandis) collected from four sites on Java Islandtoevaluatethesimilaritybetweenthedifferentteakδ18Ovaluesandthepotentialforusingteakδ18Oboth as a climate proxy and as a tool for cross-dating. Cellulose δ18O time series of Javanese teaks were found to be significantly correlated in all of the comparisons between sites, even between sites separated by a distance as great as 400km. While significant correlations did not appear in the ring width data between our samples (expressed population signal (EPS)=0.64; Rbar=0.23; sample depth=10), they were found between the cellulose δ18O values (EPS=0.89; Rbar=0.58; sample depth=10). These results suggest that teak δ18O variations have higher spatial coherence and might be a useful tool for cross-dating. A significant negative correlation was observed between cellulose δ18O and the relative humidity/precipitation during the rainy season, indicating that the cellulose δ18O of Javanese teak is an effective proxy for relative humidity/precipitation during the rainy season. Celluloseδ18O was found to bepositively correlated with precipitation during the dry season preceding the growing season, whereas it showed no correlations with the temperature and Palmer Drought Severity Index (PDSI), the key constraints of δ18O on the Indochina Peninsula.

Dendrochronologia (52) (2018) 80-86

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DOI: doi:https://doi.org/10.1016/j.dendro.2018.09.010.

No. Arsip : LIPI-20200129
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