DOI: 10.1016/j.palaeo.2012.12.023
论文题名: Late and postglacial vegetation and fire history from Cordón Serrucho Norte, northern Patagonia
作者: Markgraf V. ; Iglesias V. ; Whitlock C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 371 起始页码: 109
结束页码: 118
语种: 英语
英文关键词: Biogeography
; Fire history
; Late Quaternary paleoclimate
; Patagonia
; Rainforest taxa refuges
英文摘要: Pollen, macrofossil and charcoal analyses of a peat record from the Cordón Serrucho Norte mountain range east of the Andes in northern Patagonia (41°46'5″;S, 71°25'13″;W) provide vegetation and fire histories for the last 17,500. cal. yr. BP. The site is very distinctive as two rainforest conifers, Fitzroya cupressoides and Pilgerodendron uviferum, grow on the wetland with the more xeric Austrocedrus chilensis on the adjacent slopes, posing the question of how far back in time these Cupressaceae taxa co-occurred at the site. Late glacial regional vegetation changed from a pioneer herbaceous steppe to grass-dominated steppe at 16,500. cal. yr. BP and to closed Nothofagus forest by 15,200. cal. yr. BP, reflecting a two-step increase in precipitation. A shift to open forest and high fire frequency between 11,200 and 7000. cal. yr. BP is a consistent feature throughout northern Patagonia, indicating variable precipitation and seasonal drought. Between 7000 and 3000. cal. yr. BP, Nothofagus forest expanded again, fire frequency decreased and a Sphagnum magellanicum bog developed, replacing the Cyperaceae wetland, indicating year-round moisture. Present-day mixed Nothofagus dombeyi-. A. chilensis forest developed after 3000. cal. yr. BP when fire frequency was again high. High precipitation variability in the late Holocene is most likely related to the onset of strengthening of ENSO. Our data, including stomata and wood analyses, do not unequivocally identify the age of co-existence of the three Cupressaceae taxa in the region. However, inferred moisture conditions, combined with genetic and dendroclimatic studies on Fitzroya and Pilgerodendron, suggest that this wetland site could have offered suitable habitat for these rainforest taxa during the last 17,500. years, while the initial steppe environments and surrounding rocky and steep slopes could have provided adequate conditions for Austrocedrus. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69847
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Arctic and Alpine Research, University of Colorado, Northern Arizona University, Boulder CO 80309, Flagstaff, AZ 86011, United States; Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States
Recommended Citation:
Markgraf V.,Iglesias V.,Whitlock C.. Late and postglacial vegetation and fire history from Cordón Serrucho Norte, northern Patagonia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,371