biogenicsilicacontentsoflakeqinghaisedimentsanditsenvironmentalsignificance

	biogenicsilicacontentsoflakeqinghaisedimentsanditsenvironmentalsignificance
	Liu Bin 1; Xu Hai 1; Lan Jianghu 1; Sheng Enguo 1; Che Shuai 1; Zhou Xinying 2
刊名	frontiersofearthscience
	2014
卷号	000 期号:004 页码:573
ISSN号	2095-0195
英文摘要	Changes in the levels ofbiogenic 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.
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/10883]
专题	中国科学院古脊椎动物与古人类研究所
作者单位	1.中国科学院地球环境研究所 2.中国科学院古脊椎动物与古人类研究所
推荐引用方式 GB/T 7714	Liu Bin,Xu Hai,Lan Jianghu,et al. biogenicsilicacontentsoflakeqinghaisedimentsanditsenvironmentalsignificance[J]. frontiersofearthscience,2014,000(004):573.
APA	Liu Bin,Xu Hai,Lan Jianghu,Sheng Enguo,Che Shuai,&Zhou Xinying.(2014).biogenicsilicacontentsoflakeqinghaisedimentsanditsenvironmentalsignificance.frontiersofearthscience,000(004),573.
MLA	Liu Bin,et al."biogenicsilicacontentsoflakeqinghaisedimentsanditsenvironmentalsignificance".frontiersofearthscience 000.004(2014):573.