Holocene fire, vegetation, and climate dynamics inferred from charcoal and pollen record in the eastern Tibetan Plateau

被引:18
作者
Zhao, Wenwei [1 ]
Zhao, Yan [2 ,3 ]
Qin, Feng [2 ]
机构
[1] Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany
[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 101407, Peoples R China
基金
中国国家自然科学基金;
关键词
Biome reconstruction; Fire dynamics; Summer monsoon; Zoige Basin; FOREST-FIRES; MICROSCOPIC CHARCOAL; ASIAN MONSOON; QINGHAI LAKE; HISTORY; WOOD; ACCUMULATION; DEPOSITION; SEDIMENTS; DECLINE;
D O I
10.1016/j.jseaes.2017.07.017
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Understanding fire history and its driving mechanisms can provide valuable insights into present fire regime (intensity, severity and frequency), the interplay between vegetation and fire, and trigger of fire activities. Here we reconstruct the Holocene fire history in the Zoige Basin on the eastern Tibetan Plateau, on the basis of sedimentary micro-charcoal record over the last 10.0 ka (1 ka = 1000 cal yr BP) and discuss the influences of vegetation and climate on fire dynamics. Our results show that regional fire was active at 10.0-3.3 ka and a significant decrease in fire activity characterized the period after 3.3 ka. The high regional fire frequency at 10.0-3.3 ka is consistent with the forested landscape suggested by high affinity scores of cool mixed forest biome (mainly consisted of spruce), implying that fire dynamics during this period was generally controlled by the variations of arboreal biomass and summer temperature. During 6.3-4.6 ka the prevailing Asian summer monsoon provided increased moisture to this region and thus suppressed fire activities to an extent, despite the availability of abundant biomass. Declined tree biomass after 3.3 ka probably accounted for the decreased fire activities. In addition, two successive fire events at ca. 3.5-3.3 ka were likely responsible for the subsequent abrupt decline of forest components in the landscape.
引用
收藏
页码:9 / 16
页数:8
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