Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1007/s11430-020-9693-y |
| Modern pollen assemblages of the surface lake sediments from the steppe and desert zones of the Tibetan Plateau | |
| Qin, Feng | |
| 通讯作者 | Qin, F (corresponding author), Chinese Acad Sci, Key Lab Land Surface Pattern & Simulat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China. |
| 来源期刊 | SCIENCE CHINA-EARTH SCIENCES
 |
| ISSN | 1674-7313 |
| EISSN | 1869-1897 |
| 出版年 | 2021 |
| 卷号 | 64期号:3页码:425-439 |
| 英文摘要 | Modern pollen analysis is the basis for revealing the palaeovegetation and palaeoclimate changes from fossil pollen spectra. Many studies pertaining to the modern pollen assemblages on the Tibetan Plateau have been conducted, but little attention has been paid to pollen assemblages of surface lake sediments. In this study, modern pollen assemblages of surface lake sediments from 34 lakes in the steppe and desert zones of the Tibetan Plateau are investigated and results indicate that the two vegetation zones are dominated by non-arboreal pollen taxa and show distinctive characteristics. The pollen assemblages from the desert zone contain substantially high relative abundance of Chenopodiaceae while those from the steppe zone are dominated by Cyperaceae. Pollen ratios show great potential in terms of separating different vegetation zones and to indicate climate changes on the Tibetan Plateau. The Artemisia/Chenopodiaceae ratio and arboreal/non-arboreal pollen ratio could be used as proxies for winter precipitation. Artemisia/Cyperaceae ratio and the sum of relative abundance of xerophilous elements increase with enhanced warming and aridity. When considering the vegetation coverage around the lakes, hierarchical cluster analysis suggests that the studied sites can be divided into four clusters: meadow, steppe, desert-steppe, and desert. The pollen-based vegetation classification models are established using a random forest algorithm. The random forest model can effectively separate the modern pollen assemblages of the steppe zone from those of the desert zone on the Tibetan Plateau. The model for distinguishing the four vegetation clusters shows a weaker but still valid classifying power. It is expected that the random forest model can provide a powerful tool to reconstruct the palaeovegetation succession on the Tibetan Plateau when more pollen data from surface lake sediments are included. |
| 英文关键词 | Modern pollen assemblage Tibetan Plateau Surface lake sediment Pollen-climate relationship Pollen-based vegetation classification model |
| 类型 | Article |
| 语种 | 英语 |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000610463800001 |
| WOS关键词 | QUANTITATIVE RECONSTRUCTION ; SPATIAL-PATTERN ; VEGETATION ; CLIMATE ; SAMPLES ; REPRESENTATION ; GRADIENT ; IMPACTS ; RATIO ; RAIN |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS研究方向 | Geology |
| 来源机构 | 中国科学院地理科学与资源研究所 |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/351631 |
| 作者单位 | [Qin, Feng] Chinese Acad Sci, Key Lab Land Surface Pattern & Simulat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qin, Feng. Modern pollen assemblages of the surface lake sediments from the steppe and desert zones of the Tibetan Plateau[J]. 中国科学院地理科学与资源研究所,2021,64(3):425-439. |
| APA | Qin, Feng.(2021).Modern pollen assemblages of the surface lake sediments from the steppe and desert zones of the Tibetan Plateau.SCIENCE CHINA-EARTH SCIENCES,64(3),425-439. |
| MLA | Qin, Feng."Modern pollen assemblages of the surface lake sediments from the steppe and desert zones of the Tibetan Plateau".SCIENCE CHINA-EARTH SCIENCES 64.3(2021):425-439. |
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