Climate Change Data Portal
DOI | 10.1016/j.quascirev.2018.11.002 |
Identifying the 'savanna' signature in lacustrine sediments in northern Australia | |
Bird, Michael I.1,2,3; Brand, Michael1,3; Diefendorf, Aaron F.4; Haig, Jordahna L.1,2,3; Hutley, Lindsay B.5,6; Levchenko, Vladimir7; Ridd, Peter V.8; Rowe, Cassandra1,2,3; Whinney, James8; Wurster, Christopher M.1,2,3; Zwart, Costijn1,2,3 | |
发表日期 | 2019 |
ISSN | 0277-3791 |
卷号 | 203页码:233-247 |
英文摘要 | This study reports palynological and geochemical results for modern and ancient sediments from 19 lakes on a rainfall gradient (784-1880 mm), across a range of savannas in Northern Australia. All proxies varied significantly across the range of sites examined, providing a robust envelope of values that can reliably be employed to identify a savanna signature in the sedimentary record. While the results indicate it is possible to identify a savanna, we found only three statistically significant relationships between any proxy measured in surface sediments and the major climate driver of savanna vegetation composition (rainfall amount). This is because edaphic factors play a dominant role in determining vegetation composition and also potentially because of the impact of land use change. Measures of fire determined by charcoal counting were positively correlated with geochemical measures of pyrogenic carbon abundance, suggesting both record a similar signal. While measures of fire incidence were not correlated with rainfall, there was a significant positive correlation between charcoal abundance and number of fires early in the dry season, suggesting that charcoal abundance is controlled more by the number/timing of fires than climate. There was also a significant correlation between the delta C-13-value of pyrogenic carbon and tree:grass ratio derived from palynological indicators, indicating that the delta C-13-value of PyC is a reliable indicator of savanna 'woodiness'. Comparison of the carbon isotope composition of total organic carbon, PyC and n-alkanes between modern and Holocene sediments suggest that the savannas of the region have remained either similar in 'woodiness' or have thickened over the last millennia. (C) 2018 Elsevier Ltd. All rights reserved. |
WOS研究方向 | Physical Geography ; Geology |
来源期刊 | QUATERNARY SCIENCE REVIEWS |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/90657 |
作者单位 | 1.James Cook Univ, Coll Sci & Engn, POB 6811, Cairns, Qld 4870, Australia; 2.James Cook Univ, Ctr Trop Environm & Sustainabil Sci, POB 6811, Cairns, Qld 4870, Australia; 3.James Cook Univ, ARC Ctr Excellence Australian Biodivers & Heritag, POB 6811, Cairns, Qld 4870, Australia; 4.Univ Cincinnati, Dept Geol, POB 210013, Cincinnati, OH 45221 USA; 5.Charles Darwin Univ, Sch Environm, Darwin, NT 0909, Australia; 6.Charles Darwin Univ, Res Inst Environm & Livelihoods, Darwin, NT 0909, Australia; 7.Australian Nucl Sci & Technol Org, Locked Bag 2001, Kirrawee Dc, NSW 2232, Australia; 8.James Cook Univ, Sch Engn & Phys Sci, Townsville, Qld 4811, Australia |
推荐引用方式 GB/T 7714 | Bird, Michael I.,Brand, Michael,Diefendorf, Aaron F.,et al. Identifying the 'savanna' signature in lacustrine sediments in northern Australia[J],2019,203:233-247. |
APA | Bird, Michael I..,Brand, Michael.,Diefendorf, Aaron F..,Haig, Jordahna L..,Hutley, Lindsay B..,...&Zwart, Costijn.(2019).Identifying the 'savanna' signature in lacustrine sediments in northern Australia.QUATERNARY SCIENCE REVIEWS,203,233-247. |
MLA | Bird, Michael I.,et al."Identifying the 'savanna' signature in lacustrine sediments in northern Australia".QUATERNARY SCIENCE REVIEWS 203(2019):233-247. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。