TY  - JOUR
A1  - Herzschuh, Ulrike
A1  - Kürschner, Harald
A1  - Mischke, Steffen
T1  - Temperature variability and vertical vegetation belt shifts during the last similar to 50,000 yr in the Qilian Mountains (NE margin of the Tibetan Plateau, China)
N2  - A 13.94-m-long sediment core, collected from a medium-sized lake in the Qilian Mountains (NE Tibetan Plateau, China), was analysed palynologically at 81 horizons. The interpretation of indicator taxa yielded various vertical shifts of the vegetation belts. These palaeovegetation results have been checked with lake surface pollen spectra from 8 takes representing different altitudinal vegetation belts. Our main findings are the following: A short period of the late Marine Isotope Stage 3 (around similar to 46,000 yr ago) was characterized by interglacial temperature conditions with a tree line above its present-day altitude. During the LGM, the vicinity of the lake was not covered by ice but by sparse alpine vegetation and alpine deserts, indicating that the climate was colder by similar to 4-7 degrees C than today Markedly higher temperatures were inferred from higher arboreal pollen frequencies between similar to 13,000 and similar to 7000 yr ago with a Holocene temperature optimum and a maximal Picea-Betula mixed-forest expansion between similar to 9000 and similar to 7000 yr ago, when temperatures exceeded the present-day conditions by at least 1-2 degrees C. Alpine steppes and meadows and sub-alpine shrub vegetation dominated around the lake since the middle Holocene, suggesting that vegetation and climate conditions were exceptionally stable in comparison to previous periods.
Y1  - 2006
UR  - http://www.sciencedirect.com/science/journal/00335894
U6  - https://doi.org/10.1016/j.yqres.2006.03.001
SN  - 0033-5894
ER  - 
TY  - JOUR
A1  - Herzschuh, Ulrike
A1  - Kürschner, Harald
A1  - Battarbee, Rick
A1  - Holmes, Jonathan
T1  - Desert plant pollen production and a 160-year record of vegetation and climate change on the Alashan Plateau, NW China
N2  - Recent and subfossil pollen spectra from the Alashan Plateau are presented in order to provide information on desert plant representation and on recent changes in vegetation and climate in this remote area in northern China. The desert vegetation composition is faithfully represented by the surface pollen spectra. The comparison of the desert plant species to the related pollen taxa yielded the following sequence from over-representation to under- representation: Chenopodiaceae, Artemisia, Ephedra fragilis-type s.l., Reaumuria, Nitraria and Calligonum. A 72 cm long sediment record from a small hydrologically-closed inter-dune lake (SE Badan Jilin Sand Sea, southern Alashan Plateau) covering the past similar to 160 years (dated by(137)Cs) was analysed palynologically. Intervals of denser Artemisia coverage on the sand dunes around the lake, indicating wetter climate, occurred from the mid-1850s to the mid-1870s, during the first two decades of the 20th century and from the late 1930s to the beginning of the 1960s
Y1  - 2006
UR  - http://www.springerlink.com/content/107470
U6  - https://doi.org/10.1007/s00334-005-0031-9
SN  - 0939-6314
ER  -