KMS Institute of Vertebrate Paleontology and Paleoanthropology
| Biogenic silica contents of Lake Qinghai sediments and its environmental significance | |
| Liu, Bin1,2; Xu, Hai1; Lan, Jianghu1,2; Sheng, Enguo1,2; Che, Shuai1; Zhou, Xinying3 | |
| 2014-12-01 | |
| 发表期刊 | FRONTIERS OF EARTH SCIENCE
 |
| 卷号 | 8期号:4页码:573-581 |
| 文章类型 | Article |
| 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. |
| 关键词 | Biogenic Silica Environmental Significance Lake Qinghai Precipitation |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 关键词[WOS] | OXYGEN-ISOTOPE RECORD ; MODERN CLASTIC LAKE ; TIBETAN PLATEAU ; ACCUMULATION ; BAIKAL ; CARBON ; CHINA ; MODEL ; OPAL ; SEA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000345389600011 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/7364 |
| 专题 | 中科院古脊椎所（2000年以后） |
| 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. |
| 条目包含的文件 | 下载所有文件 | |||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| liu2014.pdf（467KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论