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DOI	10.1007/s10933-013-9747-1
	Recent ecological responses to climate variability and human impacts in the Nianbaoyeze Mountains (eastern Tibetan Plateau) inferred from pollen, diatom and tree-ring data
	Wischnewski, Juliane; Herzschuh, Ulrike; Ruehland, Kathleen M.; Braeuning, Achim; Mischke, Steffen; Smol, John P.; Wang, Lily
通讯作者	Wischnewski, J (通讯作者)
发表日期	2014
ISSN	0921-2728
EISSN	1573-0417
起始页码	287
结束页码	302
卷号	51 期号:2
英文摘要	The Tibetan Plateau is a region that is highly sensitive to recent global warming, but the complexity and heterogeneity of its mountainous landscape can result in variable responses. In addition, the scarcity and brevity of regional instrumental and palaeoecological records still hamper our understanding of past and present patterns of environmental change. To investigate how the remote, high-alpine environments of the Nianbaoyeze Mountains, eastern Tibetan Plateau, are affected by climate change and human activity over the last similar to 600 years, we compared regional tree-ring studies with pollen and diatom remains archived in the dated sediments of Dongerwuka Lake (33.22A degrees N, 101.12A degrees E, 4,307 m a.s.l.). In agreement with previous studies from the eastern Tibetan Plateau, a strong coherence between our two juniper-based tree-ring chronologies from the Nianbaoyeze and the Anemaqin Mountains was observed, with pronounced cyclical variations in summer temperature reconstructions. A positive directional trend to warmer summer temperatures in the most recent decades, was, however, not observed in the tree-ring record. Likewise, our pollen and diatom spectra showed minimal change over the investigated time period. Although modest, the most notable change in the diatom relative abundances was a subtle decrease in the dominant planktonic Cyclotella ocellata and a concurrent increase in small, benthic fragilarioid taxa in the similar to 1820s, suggesting higher ecosystem variability. The pollen record subtly indicates three periods of increased cattle grazing activity (similar to 1400-1480 AD, similar to 1630-1760 AD, after 1850 AD), but shows generally no significant vegetation changes during past similar to 600 years. The minimal changes observed in the tree-ring, diatom and pollen records are consistent with the presence of localised cooling centres that are evident in instrumental and tree-ring data within the southeastern and eastern Tibetan Plateau. Given the minor changes in regional temperature records, our complacent palaeoecological profiles suggest that climatically induced ecological thresholds have not yet been crossed in the Nianbaoyeze Mountains region.
关键词	LAND-COVER CHANGES NITROGEN DEPOSITION LAKE-SEDIMENTS TIME-SERIES RECORD TEMPERATURE MONSOON SHIFTS GLACIERS HISTORY
英文关键词	Tibetan Plateau; Nianbaoyeze Mountains; Pollen; Diatoms; Tree-ring; Climate change; Human impact
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Limnology
WOS记录号	WOS:000330734400010
来源期刊	JOURNAL OF PALEOLIMNOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258395
推荐引用方式 GB/T 7714	Wischnewski, Juliane,Herzschuh, Ulrike,Ruehland, Kathleen M.,et al. Recent ecological responses to climate variability and human impacts in the Nianbaoyeze Mountains (eastern Tibetan Plateau) inferred from pollen, diatom and tree-ring data[J]. 中国科学院青藏高原研究所,2014,51(2).
APA	Wischnewski, Juliane.,Herzschuh, Ulrike.,Ruehland, Kathleen M..,Braeuning, Achim.,Mischke, Steffen.,...&Wang, Lily.(2014).Recent ecological responses to climate variability and human impacts in the Nianbaoyeze Mountains (eastern Tibetan Plateau) inferred from pollen, diatom and tree-ring data.JOURNAL OF PALEOLIMNOLOGY,51(2).
MLA	Wischnewski, Juliane,et al."Recent ecological responses to climate variability and human impacts in the Nianbaoyeze Mountains (eastern Tibetan Plateau) inferred from pollen, diatom and tree-ring data".JOURNAL OF PALEOLIMNOLOGY 51.2(2014).