Inter- and intra-annual tree-ring cellulose oxygen isotope variability in response to precipitation in Southeast China

Chenxi Xu*, Huaizhou Zheng, Takeshi Nakatsuka, Masaki Sano, Zhen Li, Junyi Ge

*この研究の対応する著者

研究成果査読

24 被引用数 (Scopus)

抄録

Key message: Compared with annual tree-ring cellulose δ18O, intra-annual cellulose δ18O has potential to reconstruct precipitation with higher resolution and stronger signal intensity. Abstract: Annual tree-ring cellulose oxygen isotope values (δ18O) of Fokienia hodginsii provide a promising proxy of monsoon-season precipitation in Southeast China. Measuring intra-annual cellulose δ18O values may reveal the seasonal variability of precipitation and the associated climate influences. Here, we examine intra-annual variation of cellulose δ18O values in Fokienia hodginsii and Cryptomeria fortune from Fujian Province, Southeast China. Both species exhibited considerable intra-annual variations in cellulose δ18O (range ~6 ‰) with a consistent pattern of enriched values near the annual ring boundary and depleted values in the central portion of the ring. Seasonal patterns in the tree-ring δ18O values generally followed changes in precipitation δ18O values. Compared with annual tree-ring cellulose δ18O, intra-annual cellulose δ18O has potential to reconstruct precipitation with higher resolution and stronger signal intensity. July tree-ring cellulose δ18O is significantly correlated (r = −0.58, p < 0.05) with July precipitation, and June–August tree-ring cellulose δ18O and annual tree-ring cellulose δ18O, respectively, explain 52 and 41 % of the actual variance of April–August precipitation. In addition, May–October cellulose δ18O values during El Niño years are higher than in La Niña years, and April to October rainfall is lower in El Niño years than in La Niña years. Combining the significant correlations between inter-annual cellulose δ18O values and sea surface temperatures in the central tropical Pacific, our results support the hypothesis that El Niño–Southern Oscillation affects tree-ring cellulose δ18O in Southeast China by modulating seasonal precipitation.

本文言語English
ページ(範囲)785-794
ページ数10
ジャーナルTrees - Structure and Function
30
3
DOI
出版ステータスPublished - 2016 6 1
外部発表はい

ASJC Scopus subject areas

  • 林業
  • 生理学
  • 生態学
  • 植物科学

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