气候变化领域集成服务门户(CCPortal): Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia

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DOI	10.1029/2020GL090964
	Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia
	Karp A.T.; Andrae J.W.; McInerney F.A.; Polissar P.J.; Freeman K.H.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	C4 grasslands proliferated later in Australia than they did on other continents (∼3.5 Ma vs. 10–5 Ma). It remains unclear whether this delay reflects differences in climate conditions or ecological feedbacks, such as fire, that promote C4 ecosystems. Here, we evaluated these factors using terrestrial biomarkers from marine sediments off western Australia. Fire-derived polycyclic aromatic hydrocarbons (PAH) indicate fire ecology did not substantially change during or following C4 expansion. The presence of fire-adapted C3 woody vegetation likely diminished the role of fire and delayed C4 expansion until it was prompted by climate drying between 3.5 and 3.0 Ma. At the same time, mass accumulation rates of weathered PAHs increased 100-fold, which indicates a significant loss of soil carbon accompanied this ecosystem shift. The tight couplings between hydroclimate and carbon storage altered boundary conditions for Australian ecosystems, and similar abrupt behavior may shape environmental responses to climate change. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Biomarkers; Climate change; Ecosystems; Expansion; Forestry; Polycyclic aromatic hydrocarbons; Submarine geology; Australian ecosystems; Climate condition; Environmental response; Mass accumulation rates; Polycyclic aromatic hydrocarbon (PAH); Terrestrial biomarkers; Western Australia; Woody vegetation; Fires
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169194
作者单位	Geosciences Department, The Pennsylvania State University, University ParkPA, United States; Now at Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States; Department of Earth Science, School of Physical Sciences, Sprigg Geobiology Centre, The University of Adelaide, Adelaide, SA, Australia; Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Karp A.T.,Andrae J.W.,McInerney F.A.,et al. Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia[J],2021,48(2).
APA	Karp A.T.,Andrae J.W.,McInerney F.A.,Polissar P.J.,&Freeman K.H..(2021).Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia.Geophysical Research Letters,48(2).
MLA	Karp A.T.,et al."Soil Carbon Loss and Weak Fire Feedbacks During Pliocene C4 Grassland Expansion in Australia".Geophysical Research Letters 48.2(2021).