DOI: 10.1016/j.epsl.2021.116880
论文题名: Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes
作者: Azevedo V. ; Strikis N.M. ; Novello V.F. ; Roland C.L. ; Cruz F.W. ; Santos R.V. ; Vuille M. ; Utida G. ; De Andrade F.R.D. ; Cheng H. ; Edwards R.L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563 语种: 英语
中文关键词: Caatinga
; carbon isotope
; Cerrado
; paleovegetation
; speleothem
; strontium isotope
英文关键词: Soils
; Tropics
; Vegetation
; Caatinga
; Carbon isotopes
; Cerrado
; Geochemical proxies
; Late Pleistocene
; Multi proxies
; Paleovegetation
; Pollen analysis
; Speleothem
; Strontium isotopes
; Isotopes
; biome
; caatinga
; carbon isotope
; cerrado
; Pleistocene
; speleothem
; strontium isotope
; vegetation history
; Brazil
英文摘要: Paleovegetation studies in Brazil have been mostly based on pollen analysis and geochemical proxies in lacustrine and soil records. These records, however, are sparsely located in the continent and, in most of the cases, centered over the Holocene, giving a minor picture of past vegetation since the Last Glacial Maximum. Stalagmites have been long used as recorders of paleoprecipitation and monsoon activity over time in tropical and subtropical South America by using δ18O analyses, but recently they also showed the potential to record past vegetation and soil changes through the combined use of δ13C and 87Sr/86Sr. We utilize this new approach to determine the periods of paleovegetation transition and soil development in the Cerrado (Brazilian savanna) biome from central Brazil. Our results show a coherent period of transition from sparser vegetation and shallower soil above the cave to denser vegetation and thicker soil since the last deglaciation circa 15 ka BP. The timing of this transition is different from the multiproxy evidence found in the Caatinga (dry forest) biome, in northeastern Brazil, circa 4.2 ka BP, resulting in a period of paleovegetation seesaw pattern between central and northeastern regions of Brazil. Additionally, atmospheric pCO2 and temperature variations may have played a major role on the paleovegetation transition in the Cerrado region whereas precipitation linked to the Intertropical Convergence Zone was the major modulator of paleovegetation in the Caatinga. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165402
Appears in Collections: 气候变化与战略
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作者单位: Departamento de Geoquímica, Universidade Federal Fluminense, Niterói, 24020-141, Brazil; Instituto de Geociências, Universidade de São Paulo, São Paulo, 05508-080, Brazil; Instituto de Geociências, Universidade de Brasília, Brasília, 70910-900, Brazil; Department of Atmospheric and Environmental Sciences, University at Albany, Albany, NY, United States; Institute of Global Environmental Change, Xi'an Jiaotong University, Shaanxi, 710049, China; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States
Recommended Citation:
Azevedo V.,Strikis N.M.,Novello V.F.,et al. Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes[J]. Earth and Planetary Science Letters,2021-01-01,563