Biogenic silica contents of Lake Qinghai sediments and its environmental significance

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	Biogenic silica contents of Lake Qinghai sediments and its environmental significance
	Liu, Bin 1,2; Xu, Hai 1; Lan, Jianghu 1,2; Sheng, Enguo 1,2; Che, Shuai 1; Zhou, Xinying 3
刊名	FRONTIERS OF EARTH SCIENCE
	2014-12-01
卷号	8 期号:4 页码:573-581
关键词	Biogenic Silica Environmental Significance Lake Qinghai Precipitation
文献子类	Article
英文摘要	Changes in the levels of biogenic silica (BSi%) in lake sediments have been widely used in order to study lake productivity and palaeoclimatic changes. However, the provenance of biogenic silica (BSi) needs to be investigated for each lake, especially for large lakes, as does the relationship between levels of BSi and relevant environmental factors. In this study, we measured the percentage of BSi contained in lake sediments, river sediments, and surface soils within the Lake Qinghai catchment, and compared the quantities and shapes of diatoms and phytoliths before and after the extraction processes. The results suggest that BSi in lake sediments is primarily derived from endogenous diatoms; therefore, BSi levels can be used to reflect the changes in primary productivity within the lake. Further comparisons showed that on long-term timescales, the variations in BSi% are generally consistent with those in total organic carbon (TOC) and grain size, reflecting the dominant impacts of precipitation on primary productivity in Lake Qinghai. On short-term timescales, however, the relationship between BSi% and TOC and that between BSi% and grain size are not clear or stable. For example, BSi% sometimes covaried with grain size, but it was sometimes out of phase with or even inversely related to grain size. We speculate that both climate and environmental processes, such as the dilution effect, influence short-term BSi% and its related environmental significance. As a result, BSi% should be used selectively as an indicator of climatic changes on different time scales.
WOS关键词	OXYGEN-ISOTOPE RECORD ; MODERN CLASTIC LAKE ; TIBETAN PLATEAU ; ACCUMULATION ; BAIKAL ; CARBON ; CHINA ; MODEL ; OPAL ; SEA
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000345389600011
内容类型	期刊论文
源URL	[http://124.16.247.212/handle/311034/7364]
专题	古脊椎动物与古人类研究所_图书馆1
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Lab Human Evolut & Archeol Sci, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Liu, Bin,Xu, Hai,Lan, Jianghu,et al. Biogenic silica contents of Lake Qinghai sediments and its environmental significance[J]. FRONTIERS OF EARTH SCIENCE,2014,8(4):573-581.
APA	Liu, Bin,Xu, Hai,Lan, Jianghu,Sheng, Enguo,Che, Shuai,&Zhou, Xinying.(2014).Biogenic silica contents of Lake Qinghai sediments and its environmental significance.FRONTIERS OF EARTH SCIENCE,8(4),573-581.
MLA	Liu, Bin,et al."Biogenic silica contents of Lake Qinghai sediments and its environmental significance".FRONTIERS OF EARTH SCIENCE 8.4(2014):573-581.