Vegetation changes and environmental evolution in the Urumqi River Head, central Tianshan mountains since 3.6 ka BP: a case study of Daxigou profile

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Vegetation changes and environmental evolution in the Urumqi River Head, central Tianshan mountains since 3.6 ka BP: a case study of Daxigou profile
	Zhang ; Y ; Kong ; ZC ; Yang ; ZJ ; Yan ; S ; Ni ; J
刊名	ACTA BOTANICA SINICA
	2004
卷号	46 期号:6 页码:655-667
关键词	CHARCOAL ANALYSIS FIRE HISTORY POLLEN RECORD QUATERNARY MINNESOTA CLIMATE SPRUCE
ISSN号	1672-6650
通讯作者	Ni, J, Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China
中文摘要	A relatively high resolution pollen record and data of loss of ignition (LOI), grain size and susceptibility of the Daxigou profile in the head area of the Urumqi River, central Tianshan Mountains, revealed new information about vegetation changes and environmental evolution since 3.6 ka BP. Results showed that from 3.6 ka BP to present, climate was unstable with multi-changes of warming-cooling and wetting-drying. From ca. 3.6 to 3.2 ka BP, climate was warmer and more humid than today. Climate changed to cooler and drier between ca. 3.2 and 2.0 ka BR coinciding with a glacier advance in the head area of the Urumqi River. From ca. 2.0 to 1.4 ka BP, climate became warmer and more humid again. From ca. 1.4 to 0.5 ka BP temperature and humidity went on increasing and a period of Climatic Optimum since 3.6 ka BP might occur. A few limnetic hydrophytes pollen are counted for all zones, indicating a freshwater habitat since 3.6 ka BP in this region. Based on synthetically analysis of ecological characteristics and dispersal of spruce pollen, the abundance of Picea is influenced by treeline moving upward, valley wind and glacier ablation. Statistics of charcoal concentration and susceptibility further suggest that fires may have occurred in this region since 0.5 ka BP and the peak value of charcoal might be related to human activities.
学科主题	自然地理学
收录类别	SCI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/10558]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Zhang,Y,Kong,et al. Vegetation changes and environmental evolution in the Urumqi River Head, central Tianshan mountains since 3.6 ka BP: a case study of Daxigou profile[J]. ACTA BOTANICA SINICA,2004,46(6):655-667.
APA	Zhang.,Y.,Kong.,ZC.,Yang.,...&J.(2004).Vegetation changes and environmental evolution in the Urumqi River Head, central Tianshan mountains since 3.6 ka BP: a case study of Daxigou profile.ACTA BOTANICA SINICA,46(6),655-667.
MLA	Zhang,et al."Vegetation changes and environmental evolution in the Urumqi River Head, central Tianshan mountains since 3.6 ka BP: a case study of Daxigou profile".ACTA BOTANICA SINICA 46.6(2004):655-667.