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Biogenic silica contents of Lake Qinghai sediments and its environmental significance
Liu, B (Liu, Bin)[ 1,2 ]; Xu, H (Xu, Hai)[ 1 ]; Lan, JH (Lan, Jianghu)[ 1,2 ]; Sheng, EG (Sheng, Enguo)[ 1,2 ]; Che, S (Che, Shuai)[ 1 ]; Zhou, XY (Zhou, Xinying)[ 3 ]
2014-12-15
Source PublicationFRONTIERS OF EARTH SCIENCE
Volume8Issue:4Pages:573-581
Subtype期刊论文
Abstract

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.

KeywordBiogenic Silica Environmental Significance Lake Qinghai Precipitation
DOI10.1007/s11707-014-0440-0
Indexed BySCI ; SCIE
Language英语
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9750
Collection现代环境研究室
Corresponding AuthorLiu, B (Liu, Bin)[ 1,2 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.Laboratory of Human Evolution and Archeological Science, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy ofSciences, Beijing 100044, China
Recommended Citation
GB/T 7714
Liu, B ,Xu, H ,Lan, JH ,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, B ,Xu, H ,Lan, JH ,Sheng, EG ,Che, S ,&Zhou, XY .(2014).Biogenic silica contents of Lake Qinghai sediments and its environmental significance.FRONTIERS OF EARTH SCIENCE,8(4),573-581.
MLA Liu, B ,et al."Biogenic silica contents of Lake Qinghai sediments and its environmental significance".FRONTIERS OF EARTH SCIENCE 8.4(2014):573-581.
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