气候变化领域集成服务门户(CCPortal): Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes

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DOI	10.1016/j.epsl.2021.116880
	Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes
	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.
发表日期	2021
ISSN	0012821X
卷号	563
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203024
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
推荐引用方式 GB/T 7714	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],2021,563.
APA	Azevedo V..,Strikis N.M..,Novello V.F..,Roland C.L..,Cruz F.W..,...&Edwards R.L..(2021).Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes.Earth and Planetary Science Letters,563.
MLA	Azevedo V.,et al."Paleovegetation seesaw in Brazil since the Late Pleistocene: A multiproxy study of two biomes".Earth and Planetary Science Letters 563(2021).