气候变化领域集成服务门户(CCPortal): Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance

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DOI	10.1007/s11430-017-9107-9
	Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance
	Li, HuaYong; Zhang, HuCai; Chang, FengQin; Zheng, Qian; Zhang, WenXiang; Lei, GuoLiang; Lei, YanBin; Pu, Yang; Ji, JunFeng
通讯作者	Zhang, HC ; Chang, FQ (通讯作者)
发表日期	2017
ISSN	1674-7313
EISSN	1869-1897
起始页码	2171
结束页码	2180
卷号	60 期号:12
英文摘要	Lake Zigetang is located on the central Tibetan Plateau (TP) and represents a rare but typical meromictic lake in China. The lake's stable meromixis sustains microflora communities, and changes in these communities are relatively independent of climate. Therefore, these communities can be used as paleoclimate proxies. In this paper, the stratification properties and their relationships with the microflora of Lake Zigetang were analyzed. We found that water depth and climate conditions were two important factors for maintaining meromixis in Lake Zigetang. Generally, stratification was enhanced during warm periods, while temperature differences between the mixolimnion and monimolimnion were decreased during cold periods. The presence of anoxygenic phototrophic bacteria (APB) was demonstrated by the discovery of bacteriopheophytin-a (Bph-a) in the sediments. This bacterial community is mainly concentrated at the bottom of the chemocline and the top of the monimolimnion, where it forms a thin APB layer. Moreover, total APB productivity is mainly affected by the light intensity penetrating to the APB layer, which exponentially increases as the thermocline becomes shallow. Therefore, high Bph-a values in the lake corresponded to a shallow thermocline and warm periods, low Bph-a values corresponded to cold periods, and zero changes indicated that the water was completely mixed and reflected an extreme cold climate or low lake level period. Thus, Bph-a can be used as a climate proxy to reconstruct the history of lake stratification and climate changes.
关键词	ANOXYGENIC PHOTOTROPHIC BACTERIA PURPLE SULFUR BACTERIA MEROMICTIC LAKE BLACK-SEA FOSSIL PIGMENTS CLIMATE-CHANGE MONO LAKE RECORD LIGHT STRATIFICATION
英文关键词	Lake Zigetang; Tibetan Plateau; Meromictic lakes; Thermocline; Anoxygenic phototrophic bacteria
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000417942100010
来源期刊	SCIENCE CHINA-EARTH SCIENCES
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/259089
推荐引用方式 GB/T 7714	Li, HuaYong,Zhang, HuCai,Chang, FengQin,et al. Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance[J]. 中国科学院青藏高原研究所,2017,60(12).
APA	Li, HuaYong.,Zhang, HuCai.,Chang, FengQin.,Zheng, Qian.,Zhang, WenXiang.,...&Ji, JunFeng.(2017).Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance.SCIENCE CHINA-EARTH SCIENCES,60(12).
MLA	Li, HuaYong,et al."Discovery of bacteriopheophytin-a in lacustrine deposits from Lake Zigetang on the central Tibetan Plateau and its paleoenvironmental significance".SCIENCE CHINA-EARTH SCIENCES 60.12(2017).