globalchange  > 气候变化与战略
DOI: 10.5194/bg-17-1261-2020
论文题名:
Reviews and syntheses: How do abiotic and biotic processes respond to climatic variations in the Nam Co catchment (Tibetan Plateau)?
作者: Anslan S.; Azizi Rad M.; Buckel J.; Echeverria Galindo P.; Kai J.; Kang W.; Keys L.; Maurischat P.; Nieberding F.; Reinosch E.; Tang H.; Vi Tran T.; Wang Y.; Schwalb A.
刊名: Biogeosciences
ISSN: 17264170
出版年: 2020
卷: 17, 期:5
语种: 英语
Scopus关键词: Bacillariophyta ; Ostracoda
英文摘要: The Tibetan Plateau (TP) is the largest alpine plateau on Earth and plays an important role in global climate dynamics. On the TP, climate change is happening particularly fast, with an increase in air temperature twice the global average. The particular sensitivity of this high mountain environment allows observation and tracking of abiotic and biotic feedback mechanisms. Closed lake systems, such as Nam Co on the central TP, represent important natural laboratories for tracking past and recent climatic changes, as well as geobiological processes and interactions within their respective catchments. This review gives an interdisciplinary overview of past and modern environmental changes using Nam Co as a case study. In the catchment area, ongoing rise in air temperature forces glaciers to melt, contributing to a rise in lake level and changes in water chemistry. Some studies base their conclusions on inconsistent glacier inventories, but an ever-increasing deglaciation and thus higher water availability have persisted over the last few decades. Increasing water availability causes translocation of sediments, nutrients and dissolved organic matter to the lake, as well as higher carbon emissions to the atmosphere. The intensity of grazing has an additional and significant effect on CO2 fluxes, with moderate grazing enhancing belowground allocation of carbon while adversely affecting the C sink potential through reduction of above-surface and subsurface biomass at higher grazing intensities. Furthermore, increasing pressure from human activities and livestock grazing are enhancing grassland degradation processes, thus shaping biodiversity patterns in the lake and catchment. The environmental signal provided by taxon-specific analysis (e.g., diatoms and ostracods) in Nam Co revealed profound climatic fluctuations between warmer-cooler and wetter-drier periods since the late Pleistocene and an increasing input of freshwater and nutrients from the catchment in recent years. Based on the reviewed literature, we outline perspectives to further understand the effects of global warming on geodiversity and biodiversity and their interplay at Nam Co, which acts as a case study for potentially TP-level or even worldwide processes that are currently shaping high mountain areas. © 2020 BMJ Publishing Group. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158738
Appears in Collections:气候变化与战略

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作者单位: Zoological Institute, Technische Universität Braunschweig, Mendelssohnstr. 4, Braunschweig, 38106, Germany; Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Langer Kamp 19C, Braunschweig, 38106, Germany; Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Institute for Geophysics and Extraterrestrial Physics, Technische Universität Braunschweig, Mendelssohnstraße 3, Braunschweig, 38106, Germany; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Institute for Geography, Friedrich-Schiller-Universität Jena, Löbdergraben 32, Jena, 07743, Germany; Institute of Soil Science, Leibniz Universität Hannover, Herrenhäuser Str. 230419, Germany; GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany; Institute of Geodesy and Photogrammetry, Technische Universität Braunschweig, Bienroder Weg 81, Braunschweig, 38106, Germany; Institute of Fluid Mechanics and Environmental Physics in Civil Engineering, Leibniz Universität Hannover, Appelstraße 9A30167, Germany

Recommended Citation:
Anslan S.,Azizi Rad M.,Buckel J.,et al. Reviews and syntheses: How do abiotic and biotic processes respond to climatic variations in the Nam Co catchment (Tibetan Plateau)?[J]. Biogeosciences,2020-01-01,17(5)
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