globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.03.006
Scopus记录号: 2-s2.0-84960906924
论文题名:
Late-Quaternary variation in C3 and C4 grass abundance in southeastern Australia as inferred from δ13C analysis: Assessing the roles of climate, pCO2, and fire
作者: Nelson D.M.; Urban M.A.; Kershaw A.P.; Hu F.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139
起始页码: 67
结束页码: 76
语种: 英语
英文关键词: Atmospheric CO2 ; Australia ; C3 grasses ; C4 grasses ; Carbon isotopes ; Climate change ; Fire
Scopus关键词: Carbon ; Carbon dioxide ; Fires ; Plants (botany) ; Atmospheric CO ; Australia ; Carbon isotopes ; Individual grains ; Key controlling factors ; Moisture balance ; Relative abundance ; South-eastern Australia ; Climate change ; C3 plant ; C4 plant ; carbon dioxide ; carbon isotope ; climate variation ; fire behavior ; grass ; paleoclimate ; paleoecology ; proxy climate record ; Quaternary ; relative abundance ; savanna ; woodland ; Australia ; Australian Alps ; Caledonia Fen ; East Africa ; Snowy Mountains ; Victoria [Australia] ; Poaceae
英文摘要: Climate, atmospheric pCO2, and fire all may exert major influences on the relative abundance of C3 and C4 grasses in the present-day vegetation. However, the relative role of these factors in driving variation in C3 and C4 grass abundances in the paleorecord is uncertain, and C4 abundance is often interpreted narrowly as a proxy indicator of aridity or pCO2. We measured δ13C values of individual grains of grass (Poaceae) pollen in the sediments of two sites in southeastern Australia to assess changes in the proportions of C3 and C4 grasses during the past 25,000 years. These data were compared with shifts in pCO2, temperature, moisture balance, and fire to assess how these factors were related to long-term variation of C4 grass abundance during the late Quaternary. At Caledonia Fen, a high-elevation site in the Snowy Mountains, C4 grass abundance decreased from an average of 66% during the glacial period to 11% during the Holocene, primarily in response to increased pCO2 and temperature. In contrast, this pattern did not exist in low-elevation savannah woodlands around Tower Hill Northwest Crater, where C4 grass abundance instead varied in response to shifts in regional aridity. Fire did not appear to have strongly influenced the proportions of C3 and C4 grasses on the landscape at millennial timescales at either site. These patterns are similar to those of a recent study in East Africa, suggesting that elevation-related climatic differences influence how the abundance of C3 and C4 grasses responds to shifts in climate and pCO2. These results caution against using C4 plant abundance as a proxy indicator of either climate or pCO2 without an adequate understanding of key controlling factors. © 2016 Elsevier Ltd.
资助项目: Funding for this study was provided by U.S. NSF grant DEB-0816610 (FSH and DMN). Current and past members of the Centre for Palynology and Palaeoecology at Monash University did initial sediment core collection and analysis at both sites. Dr. Simon Haberle and Dr. Nick Porch collected the 2008 cores from Tower Hill NWC upon which subsequent analyses at this site for this project were undertaken. Samples for microcharcoal and SPIRAL analysis were prepared by Triet Truong, and many undergraduate students prepared and counted macrocharcoal samples. We thank an anonymous reviewer for helpful comments on an earlier version of the manuscript.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59618
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: University of Maryland Center for Environmental Science, Appalachian Laboratory, Frostburg, MD, United States; Program in Ecology, Evolution and Conservation Biology, University of Illinois, Urbana, IL, United States; School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia; Department of Plant Biology, University of Illinois, Urbana, IL, United States; Department of Geology, University of Illinois, Urbana, IL, United States

Recommended Citation:
Nelson D.M.,Urban M.A.,Kershaw A.P.,et al. Late-Quaternary variation in C3 and C4 grass abundance in southeastern Australia as inferred from δ13C analysis: Assessing the roles of climate, pCO2, and fire[J]. Quaternary Science Reviews,2016-01-01,139
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Nelson D.M.]'s Articles
[Urban M.A.]'s Articles
[Kershaw A.P.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Nelson D.M.]'s Articles
[Urban M.A.]'s Articles
[Kershaw A.P.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Nelson D.M.]‘s Articles
[Urban M.A.]‘s Articles
[Kershaw A.P.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.