El Niño-Southern Oscillation modulates insect outbreaks in humid subtropical China: Evidences from tree rings and carbon isotopes

Bai, Maowei; Yao, Qichao; Camarero, J. Julio; Hu, Haiqing; Dong, Zhipeng; Li, Yinjun; Zhou, Feifei; Chen, Xiuling; Guo, Guoyang; Cao, Xinguang; Fang, Keyan

doi:10.1016/j.dendro.2021.125815

Cited by 5 publications

(1 citation statement)

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“…There are currently many technologies and approaches used to help in improving our understanding of the response of these plants to environmental conditions. Among these approaches are wood anatomy, isotopes, X-ray densitometry, and X-ray fluorescence either separately or in combination (e.g., Haines et al., 2018 ; Mihaljevič et al., 2018 ; Gaitan-Alvarez et al., 2019 ; Bai et al., 2021 ; Pacheco-Solana et al., 2023 ). These technologies proved their usefulness in dendrochronological studies and improved our understanding of the climate-growth relationship in trees and their ecophysiology.…”

Section: Introductionmentioning

confidence: 99%

Wood anatomy and dendrochronological potentiality of some woody shrubs from the southern Mediterranean coast in Egypt

Farahat

Gärtner

2023

Front. Plant Sci.

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In tropical and subtropical regions, much research is still required to explore the dendrochronological potential of their trees. This study aims to evaluate the anatomical structure and dendrochronological potential of three Mediterranean desert shrubs in Egypt (Lycium schweinfurthii var. schweinfurthii, L. europaeum, and Calligonum polygonoides subsp. comosum) supported by X-ray density. The results showed that the target species had distinct growth rings at macroscopic and microscopic levels. The vessel traits reflected the adaptability of each species with the prevailing arid climate conditions. After the exclusion of the non-correlated series, we obtained three site chronologies that cover the years 2013-2022 for L. schweinfurthii, 2012-2022 for L. europaeum, and 2011-2022 for C. comosum. The mean series intercorrelation was 0.746, 0.564, and 0.683 for L. schweinfurthii, L. europaeum, and C. comosum, respectively. The EPS (expressed population signal) values ranged from 0.72 to 0.80, while the SNR (species-to-noise ratio) ranged from 9.1 to 21.5. Compiling all series of L. schweinfurthii raised the EPS value to 0.86. The chronologies developed for the studied species were relatively short since we dealt with multi-stemmed shrubs. The average percentage difference between latewood density (LWD) and earlywood density (EWD) in C. comosum, L. europaeum, and L. schweinfurthii were 11.8% ± 5.5, 5.2%± 1.87, and 3.6% ± 1.86, respectively. X-ray densitometry helped in the precise determination of the ring borders of the studied species. The relationships between the radial growth of the studied species and the climate variables were weak to moderate but mostly not significant (i.e., r < 0.7). Generally, the radial growth of the target species had a weak to moderate positive correlation with temperature and precipitation during the wet season (winter), while negatively correlated with temperature for the rest of the year, particularly in summer. Our data agrees with earlier findings that ring formation starts at the beginning of the long vegetative stage, then the rest of the assimilated carbohydrates are directed to the flowering and fruiting at the end of the vegetative stages. For more efficient dendrochronological studies on subtropical and Mediterranean trees, we recommend carrying out xylogenesis studies, collection of phenological data, sampling 45-80 trees per species, using new techniques, and choosing homogeneous and close sites for wood sampling.

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