气候变化领域集成服务门户(CCPortal): The Early Pliocene global expansion of C4 grasslands: A new organic carbon-isotopic dataset from the north China plain

CCPortal

DOI	10.1016/j.palaeo.2019.109454
	The Early Pliocene global expansion of C4 grasslands: A new organic carbon-isotopic dataset from the north China plain
	Lu J.; Algeo T.J.; Zhuang G.; Yang J.; Xiao G.; Liu J.; Huang J.; Xie S.
发表日期	2020
ISSN	0031-0182
卷号	538
英文摘要	C4-grasslands are known to have first expanded globally in the Late Miocene, and recent research has hinted at a second expansion phase during the Early Pliocene; however, the geographic extent of this second event and its driving force are debated. In this study, we present organic carbon-isotopic evidence from a high-resolution drillcore in North China spanning the interval from ∼8.0 Ma to the present. A prominent positive δ13Corg shift at ∼4.1 Ma marks C4-grassland expansion on the North China Plain, and rapid oscillations of >6‰ from ∼3.2 to 2.2 Ma imply large shifts between C3- and C4-dominated floras. Our δ13Corg profile mirrors carbon isotope shifts in loess-red clay deposits of the Chinese Loess Plateau, confirming the regional nature of this event. Furthermore, coeval carbon isotope records from Africa, North America, and South America provide evidence that the Early Pliocene C4-grassland expansion was global in scale and temporally distinct from the Late Miocene event. Whereas the Late Miocene event may have been related to aridification and altered fire regimes, this mechanism cannot account for the Early Pliocene expansion owing to contemporaneous increases in humidity at many Northern Hemisphere sites. We hypothesize that C4-grassland expansion in the Early Pliocene was triggered by falling atmospheric CO2 levels, as evidenced by multiple pCO2 proxy records and supported by quantum photosynthetic efficiency modeling. © 2019 Elsevier B.V.
英文关键词	Atmospheric pCO2; C4 plants; East Asian monsoon; Grassland expansion; Late miocene
语种	英语
scopus关键词	C4 plant; carbon dioxide; carbon isotope; data set; expansion; humidity; monsoon; Northern Hemisphere; photosynthesis; Pliocene; Far East
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150662
作者单位	State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH, 45221-0013, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Tianjin Center, China Geological Survey, Tianjin, 300170, China; Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074, China
推荐引用方式 GB/T 7714	Lu J.,Algeo T.J.,Zhuang G.,et al. The Early Pliocene global expansion of C4 grasslands: A new organic carbon-isotopic dataset from the north China plain[J],2020,538.
APA	Lu J..,Algeo T.J..,Zhuang G..,Yang J..,Xiao G..,...&Xie S..(2020).The Early Pliocene global expansion of C4 grasslands: A new organic carbon-isotopic dataset from the north China plain.Palaeogeography, Palaeoclimatology, Palaeoecology,538.
MLA	Lu J.,et al."The Early Pliocene global expansion of C4 grasslands: A new organic carbon-isotopic dataset from the north China plain".Palaeogeography, Palaeoclimatology, Palaeoecology 538(2020).