TY  - JOUR
A1  - Klemm, Juliane
A1  - Herzschuh, Ulrike
A1  - Pestryakova, Luidmila Agafyevna
T1  - Vegetation, climate and lake changes over the last 7000 years at the boreal treeline in north-central Siberia
JF  - Quaternary science reviews : the international multidisciplinary research and review journal
KW  - Tundra-taiga ecotone
KW  - Larix gmelinii
KW  - Palynology
KW  - Sediment geochemistry
KW  - Mean July temperature
KW  - Ordination
KW  - WA-PLS
KW  - Procrustes rotation
Y1  - 2016
U6  - https://doi.org/10.1016/j.quascirev.2015.08.015
SN  - 0277-3791
VL  - 147
SP  - 422
EP  - 434
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Wischnewski, Juliane
A1  - Kramer, Annette
A1  - Kong, Zhaochen
A1  - Mackay, Anson W.
A1  - Simpson, Gavin L.
A1  - Mischke, Steffen
A1  - Herzschuh, Ulrike
T1  - Terrestrial and aquatic responses to climate change and human impact on the southeastern Tibetan Plateau during the past two centuries
JF  - Global change biology
N2  - Rapid population growth and economic development have led to increased anthropogenic pressures on the Tibetan Plateau, causing significant land cover changes with potentially severe ecological consequences. To assess whether or not these pressures are also affecting the remote montane-boreal lakes on the SE Tibetan Plateau, fossil pollen and diatom data from two lakes were synthesized. The interplay of aquatic and terrestrial ecosystem response was explored in respect to climate variability and human activity over the past 200 years. Nonmetric multidimensional scaling and Procrustes rotation analysis were undertaken to determine whether pollen and diatom responses in each lake were similar and synchronous. Detrended canonical correspondence analysis was used to develop quantitative estimates of compositional species turnover. Despite instrumental evidence of significant climatic warming on the southeastern Plateau, the pollen and diatom records indicate very stable species composition throughout their profiles and show only very subtle responses to environmental changes over the past 200 years. The compositional species turnover (0.36-0.94 SD) is relatively low in comparison to the species reorganizations known from the periods during the mid-and early-Holocene (0.64-1.61 SD) on the SE Plateau, and also in comparison to turnover rates of sediment records from climate-sensitive regions in the circum arctic. Our results indicate that climatically induced ecological thresholds are not yet crossed, but that human activity has an increasing influence, particularly on the terrestrial ecosystem in our study area. Synergistic processes of post-Little Ice Age warming, 20th century climate warming and extensive reforestations since the 19th century have initiated a change from natural oak-pine forests to seminatural, likely less resilient pine-oak forests. Further warming and anthropogenic disturbances would possibly exceed the ecological threshold of these ecosystems and lead to severe ecological consequences.
KW  - climate change
KW  - compositional species turnover
KW  - diatoms
KW  - human impact
KW  - pollen
KW  - Procrustes rotation
KW  - Tibetan Plateau
Y1  - 2011
U6  - https://doi.org/10.1111/j.1365-2486.2011.02474.x
SN  - 1354-1013
VL  - 17
IS  - 11
SP  - 3376
EP  - 3391
PB  - Wiley-Blackwell
CY  - Malden
ER  -