气候变化领域集成服务门户(CCPortal): Vegetation cover dynamics on the northeastern Qinghai-Tibet Plateau since late Marine Isotope Stage 3

CCPortal

DOI	10.1016/j.quascirev.2023.108292
	Vegetation cover dynamics on the northeastern Qinghai-Tibet Plateau since late Marine Isotope Stage 3
	Wang, Tao; Huang, Xiaozhong; Zhang, Jun; Luo, Derui; Zheng, Min; Xiang, Lixiong; Sun, Mingjie; Ren, Xiuxiu; Sun, Yuanhao; Zhang, Shengrui
发表日期	2023
ISSN	0277-3791
EISSN	1873-457X
卷号	318
英文摘要	Knowledge of long-term changes in vegetation cover is essential for paleoenvironmental reconstruction and Earth system modeling. The vegetation on the northeastern Qinghai-Tibet Plateau (QTP) is highly sensitive to climatic changes, but studies of long-term changes in the vegetation cover of this region are lacking. To better understand the changes in the regional vegetation cover since late Marine Isotope Stage (MIS) 3, we obtained a pollen record from Luanhaizi Lake and used it to quantitatively reconstruct changes in the cover of trees and grasses using the random forest method. The pollen spectra show that the vegetation of the Luanhaizi Lake area was probably alpine tundra from late MIS3 to the Last Glacial Maximum, after which it changed to alpine steppe with alpine shrub and sparse forest at lower elevations during the last deglaciation. Alpine steppe and alpine meadow dominated the vegetation during the Holocene, with sparse forest in the surrounding low-elevation areas. The quantitative vegetation cover reconstruction suggests that the vegetation cover of the Luanhaizi Lake area was low (20-30%) during 47.0-20.0 ka. The tree cover then increased from-3% to-10%, and the grass cover increased from-20% to-45% during the last deglaciation (20.0-11.9 ka). The increasing Northern Hemisphere summer insolation caused increases in the regional temperature, meltwater supply, and monsoon precipitation, which promoted the development of steppe vegetation. The continued increases in insolation and monsoonal precipitation during the Holocene further increased the tree cover, which reached a maximum of 17.4% at-7.2 ka. Vegetation cover reconstructions from two other sites on the eastern QTP for the last deglaciation indicate contrasting patterns of changes, likely due to contrasts in elevation, climate, and environment.
关键词	Vegetation cover Qinghai-Tibet Plateau Pollen analysis Late Marine Isotope Stage 3 Random forest method
英文关键词	MODERN POLLEN ASSEMBLAGES; LAST GLACIAL MAXIMUM; QUANTITATIVE RECONSTRUCTION; INDIAN MONSOON; MILLENNIAL-SCALE; PAST VEGETATION; LAKE-SEDIMENTS; WESTERN TIBET; NORTH-AMERICA; ASIAN MONSOON
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:001076309300001
来源期刊	QUATERNARY SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282780
作者单位	Lanzhou University; University of Nottingham; Hebei Normal University; Lanzhou University
推荐引用方式 GB/T 7714	Wang, Tao,Huang, Xiaozhong,Zhang, Jun,et al. Vegetation cover dynamics on the northeastern Qinghai-Tibet Plateau since late Marine Isotope Stage 3[J],2023,318.
APA	Wang, Tao.,Huang, Xiaozhong.,Zhang, Jun.,Luo, Derui.,Zheng, Min.,...&Zhang, Shengrui.(2023).Vegetation cover dynamics on the northeastern Qinghai-Tibet Plateau since late Marine Isotope Stage 3.QUATERNARY SCIENCE REVIEWS,318.
MLA	Wang, Tao,et al."Vegetation cover dynamics on the northeastern Qinghai-Tibet Plateau since late Marine Isotope Stage 3".QUATERNARY SCIENCE REVIEWS 318(2023).