DOI: 10.1016/j.gloplacha.2015.09.008
论文题名: Oxygen isotopes in tree rings show good coherence between species and sites in Bolivia
作者: Baker J.C.A. ; Hunt S.F.P. ; Clerici S.J. ; Newton R.J. ; Bottrell S.H. ; Leng M.J. ; Heaton T.H.E. ; Helle G. ; Argollo J. ; Gloor M. ; Brienen R.J.W.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 133 起始页码: 298
结束页码: 308
语种: 英语
英文关键词: Bolivia
; Cross-dating
; Oxygen isotopes
; Tree rings
; Tropical forest
Scopus关键词: Balloons
; Forestry
; Isotopes
; Oxygen
; Precipitation (meteorology)
; Repair
; Tropics
; Bolivia
; Cross-dating
; Oxygen isotopes
; Tree rings
; Tropical forest
; O rings
; annual variation
; climate variation
; deciduous tree
; dendrochronology
; meteorology
; oxygen isotope
; precipitation intensity
; radiocarbon dating
; reconstruction
; shrub
; spatiotemporal analysis
; tree ring
; tropical forest
; Forests
; Isotopes
; Rings
; Trees
; Altiplano
; Amazon Basin
; Bolivia
; Cedrela odorata
; Polylepis tarapacana
英文摘要: A tree ring oxygen isotope (δ18OTR) chronology developed from one species (Cedrela odorata) growing in a single site has been shown to be a sensitive proxy for rainfall over the Amazon Basin, thus allowing reconstructions of precipitation in a region where meteorological records are short and scarce. Although these results suggest that there should be large-scale (>100km) spatial coherence of δ18OTR records in the Amazon, this has not been tested. Furthermore, it is of interest to investigate whether other, possibly longer-lived, species similarly record interannual variation of Amazon precipitation, and can be used to develop climate sensitive isotope chronologies. In this study, we measured δ18O in tree rings from seven lowland and one highland tree species from Bolivia. We found that cross-dating with δ18OTR gave more accurate tree ring dates than using ring width. Our "isotope cross-dating approach" is confirmed with radiocarbon "bomb-peak" dates, and has the potential to greatly facilitate development of δ18OTR records in the tropics, identify dating errors, and check annual ring formation in tropical trees. Six of the seven lowland species correlated significantly with C. odorata, showing that variation in δ18OTR has a coherent imprint across very different species, most likely arising from a dominant influence of source water δ18O on δ18OTR. In addition we show that δ18OTR series cohere over large distances, within and between species. Comparison of two C. odorata δ18OTR chronologies from sites several hundreds of kilometres apart showed a very strong correlation (r=0.80, p<0.001, 1901-2001), and a significant (but weaker) relationship was found between lowland C. odorata trees and a Polylepis tarapacana tree growing in the distant Altiplano (r=0.39, p<0.01, 1931-2001). This large-scale coherence of δ18OTR records is probably triggered by a strong spatial coherence in precipitation δ18O due to large-scale controls. These results highlight the strength of δ18OTR as a precipitation proxy, and open the way for temporal and spatial expansion of precipitation reconstructions in South America. © 2015 The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942249239&doi=10.1016%2fj.gloplacha.2015.09.008&partnerID=40&md5=f7e398c2bd69f247d8fdcfcb689a3c41
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11477
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Ecology and Global Change, School of Geography, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Baker J.C.A.,Hunt S.F.P.,Clerici S.J.,et al. Oxygen isotopes in tree rings show good coherence between species and sites in Bolivia[J]. Global and Planetary Change,2015-01-01,133.