TY  - JOUR
A1  - Tian, Fang
A1  - Qin, Wen
A1  - Zhang, Ran
A1  - Herzschuh, Ulrike
A1  - Ni, Jian
A1  - Zhang, Chengjun
A1  - Mischke, Steffen
A1  - Cao, Xianyong
T1  - Palynological evidence for the temporal stability of the plant community in the Yellow River Source Area over the last 7,400 years
JF  - Vegetation history and archaeobotany
N2  - The terrestrial ecosystem in the Yellow River Source Area (YRSA) is sensitive to climate change and human impacts, although past vegetation change and the degree of human disturbance are still largely unknown. A 170-cm-long sediment core covering the last 7,400 years was collected from Lake Xingxinghai (XXH) in the YRSA. Pollen, together with a series of other environmental proxies (including grain size, total organic carbon (TOC) and carbonate content), were analysed to explore past vegetation and environmental changes for the YRSA. Dominant and common pollen components-Cyperaceae, Poaceae, Artemisia, Chenopodiaceae and Asteraceae-are stable throughout the last 7,400 years. Slight vegetation change is inferred from an increasing trend of Cyperaceae and decreasing trend of Poaceae, suggesting that alpine steppe was replaced by alpine meadow at ca. 3.5 ka cal bp. The vegetation transformation indicates a generally wetter climate during the middle and late Holocene, which is supported by increased amounts of TOC and Pediastrum (representing high water-level) and is consistent with previous past climate records from the north-eastern Tibetan Plateau. Our results find no evidence of human impact on the regional vegetation surrounding XXH, hence we conclude the vegetation change likely reflects the regional climate signal.
KW  - Pollen
KW  - Lake Xingxinghai
KW  - Tibetan Plateau
KW  - Holocene
KW  - Vegetation change
KW  - Regional climate
Y1  - 2022
U6  - https://doi.org/10.1007/s00334-022-00870-5
SN  - 0939-6314
SN  - 1617-6278
VL  - 31
IS  - 6
SP  - 549
EP  - 558
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Tian, Fang
A1  - Herzschuh, Ulrike
A1  - Dallmeyer, Anne
A1  - Xu, Qinghai
A1  - Mischke, Steffen
A1  - Biskaborn, Boris
T1  - Environmental variability in the monsoon-westerlies transition zone during the last 1200 years - lake sediment analyses from central Mongolia and supra-regional synthesis
JF  - Quaternary science reviews : the international multidisciplinary research and review journal
N2  - A high resolution multi proxy (pollen, grain size, total organic carbon) record from a small mountain lake (Lake Khuisiin; 46.6 degrees N, 101.8 degrees E; 2270 m a.s.l.) in the south eastern Khangai Mountains of central Mongolia has been used to explore changes in vegetation and climate over the last 1200 years. The pollen data indicates that the vegetation changed from dry steppe dominated by Poaceae and Artemisia (ca AD 760-950), to Larix forest steppe (ca AD 950-1170), Larix Betula forest steppe (ca AD 1170-1380), meadow dominated by Cyperaceae and Poaceae (ca AD 1380-1830), and Larix Betula forest steppe (after similar to AD 1830). The cold-wet period between AD 1380 and 1830 may relate to the Little Ice Age. Environmental changes were generally subtle and climate change seems to have been the major driver of variations in vegetation until at least the early part of the 20th century, suggesting that either the level of human activity was generally low, or the relationship between human activity and vegetation did not alter substantially between AD 760 and 1830. A review of centennial scale moisture records from China and Mongolia revealed that most areas experienced major changes at ca AD 1500 and AD 1900. However, the moisture availability since AD 1500 varied between sites, with no clear regional pattern or relationship to present day conditions. Both the reconstructions and the moisture levels simulation on a millennium scale performed in the MPI Earth System Model indicate that the monsoon-westerlies transition area shows a greater climate variability than those areas influenced by the westerlies, or by the summer monsoon only.
KW  - Pollen
KW  - Grain size
KW  - TOC
KW  - Asian monsoon
KW  - Westerlies
KW  - Late Holocene
KW  - Vegetation change
KW  - Mongolia
Y1  - 2013
U6  - https://doi.org/10.1016/j.quascirev.2013.05.005
SN  - 0277-3791
VL  - 73
IS  - 2
SP  - 31
EP  - 47
PB  - Elsevier
CY  - Oxford
ER  -