气候变化领域集成服务门户(CCPortal): Sedimentary evidence for recent increases in production in Tibetan plateau lakes

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DOI	10.1007/s10750-010-0263-2
	Sedimentary evidence for recent increases in production in Tibetan plateau lakes
	Lami, Andrea; Turner, Simon; Musazzi, Simona; Gerli, Stefano; Guilizzoni, Piero; Rose, Neil L.; Yang, Handong; Wu, Guangjian; Yang, Ruiqian
通讯作者	Lami, A (通讯作者)
发表日期	2010
ISSN	0018-8158
EISSN	1573-5117
起始页码	175
结束页码	187
卷号	648 期号:1
英文摘要	The Tibetan Plateau is a vast, elevated plateau in Central Asia with an average elevation of over 4,500 m and contains the world's third largest store of ice. It occupies a climatic transition zone between the Asian monsoons and westerly airflow. As a result of this location, the region is sensitive to changes in climate on timescales of decades to millennia and longer. Long-term data are needed to evaluate climatic changes and their impact on ecosystems, but in areas as remote as the Tibetan Plateau, long-term instrumental records of environmental change are geographically sparse and monitoring has only been undertaken in recent times. Paleolimnological approach might be then one of the few means by which environmental variability can be ascertained at scales that allow comparison with contemporary monitoring data and future model projections. Therefore, a paleolimnological study was undertaken in eight different lakes sampled along a North-South transect across the Tibetan Plateau analysing geochemistry and algal pigment in order to assess longer term variability in the trophic condition of these systems and their potential to reconstruct changes in relation to recent climate evolution and possible human impacts. Chronologies for the last century were based on radiometric techniques (Pb-210, Am-241 and Cs-137). Results show that inorganic sediment dominates the composition of the cores used in this study. Organic carbon constitutes less than 5% d.w. in all the lake cores, except for Kemen Co core where concentrations up to 14% d.w., are observed. Corg:N ratios are generally in the order of 5-10, indicating that autochthonous algal production is the principal biological source of organic matter. Pigment preservation is generally good throughout the cores from all lakes as shown by the 430:410 nm ratio that is generally around 1.0 or higher. Six out of eight lakes show an increase in primary production in recent times. High pre-1800 AD pigment concentrations were detected only in Qinghai Lake. Since most of the lakes show a similar behaviour in the most recent section of the core, we interpret this as a response to climate and land-use changes that have increased autochthonous production throughout the Tibetan Plateau.
关键词	ORGANIC-MATTER CLIMATE-CHANGE IGNITION COMMUNITIES CARBONATE IMPACT CORES
英文关键词	Tibet; Lakes; Palaeolimnology; Algal pigment; Geochemistry
语种	英语
WOS研究方向	Marine & Freshwater Biology
WOS类目	Marine & Freshwater Biology
WOS记录号	WOS:000277284000013
来源期刊	HYDROBIOLOGIA
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/257813
推荐引用方式 GB/T 7714	Lami, Andrea,Turner, Simon,Musazzi, Simona,et al. Sedimentary evidence for recent increases in production in Tibetan plateau lakes[J]. 中国科学院青藏高原研究所,2010,648(1).
APA	Lami, Andrea.,Turner, Simon.,Musazzi, Simona.,Gerli, Stefano.,Guilizzoni, Piero.,...&Yang, Ruiqian.(2010).Sedimentary evidence for recent increases in production in Tibetan plateau lakes.HYDROBIOLOGIA,648(1).
MLA	Lami, Andrea,et al."Sedimentary evidence for recent increases in production in Tibetan plateau lakes".HYDROBIOLOGIA 648.1(2010).