Scheda di dettaglio – i prodotti della ricerca

DatoValore
TitleSedimentary evidence for recent increases in production in Tibetan plateau lakes
AbstractThe Tibetan Plateau is a vast, elevated plateau in Central Asia with an average elevation of over 4,500 m and contains the world’s third largest store of ice. It occupies a climatic transition zone between the Asian monsoons and westerly airflow. As a result of this location, the region is sensitive to changes in climate on timescales of decades to millennia and longer. Long-term data are needed to evaluate climatic changes and their impact on ecosystems, but in areas as remote as the Tibetan Plateau, long-term instrumental records of environmental change are geographically sparse and monitoring has only been undertaken in recent times. Paleolimnological approach might be then one of the few means by which environmental variability can be ascertained at scales that allow comparison with contemporary monitoring data and future model projections. Therefore, a paleolimnological study was undertaken in eight different lakes sampled along a North–South transect across the Tibetan Plateau analysing geochemistry and algal pigment in order to assess longer term variability in the trophic condition of these systems and their potential to reconstruct changes in relation to recent climate evolution and possible human impacts. Chronologies for the last century were based on radiometric techniques (210Pb, 241Am and 137Cs). Results show that inorganic sediment dominates the composition of the cores used in this study. Organic carbon constitutes less than 5% d.w. in all the lake cores, except for Kemen Co core where concentrations up to 14% d.w., are observed. Corg:N ratios are generally in the order of 5–10, indicating that autochthonous algal production is the principal biological source of organic matter. Pigment preservation is generally good throughout the cores from all lakes as shown by the 430:410 nm ratio that is generally around 1.0 or higher. Six out of eight lakes show an increase in primary production in recent times. High pre-1800 AD pigment concentrations were detected only in Qinghai Lake. Since most of the lakes show a similar behaviour in the most recent section of the core, we interpret this as a response to climate and land-use changes that have increased autochthonous production throughout the Tibetan Plateau.
SourceHydrobiologia (The Hague. Print) 648, pp. 175–187
KeywordsTibetLakesPalaeolimnologyAlgal pigmentGeochemistry
JournalHydrobiologia (The Hague. Print)
EditorKluwer Academic Publishers, Boston, Paesi Bassi
Year2010
TypeArticolo in rivista
DOI10.1007/s10750-010-0263-2
AuthorsLami, A. (1); S. Turner (2); S. Musazzi (1); S. Gerli (1); P. Guilizzoni (1); N.L. Rose (2); H. Yang (3); G. Wu (3); R. Yang (3)
Text53161 2010 10.1007/s10750 010 0263 2 ISI Web of Science WOS 000277284000013 Tibet Lakes Palaeolimnology Algal pigment Geochemistry Sedimentary evidence for recent increases in production in Tibetan plateau lakes Lami, A. 1 ; S. Turner 2 ; S. Musazzi 1 ; S. Gerli 1 ; P. Guilizzoni 1 ; N.L. Rose 2 ; H. Yang 3 ; G. Wu 3 ; R. Yang 3 1 CNR Istituto per lo Studio delgi Ecosistemi, Verbania, Italy 2 Department of Geography, ECRC, University College, London, UK 3 Institute of Tibetan Plateau Research ITP , Chinese Academy of Sciences, Beijing, People’s Republic China The Tibetan Plateau is a vast, elevated plateau in Central Asia with an average elevation of over 4,500 m and contains the world’s third largest store of ice. It occupies a climatic transition zone between the Asian monsoons and westerly airflow. As a result of this location, the region is sensitive to changes in climate on timescales of decades to millennia and longer. Long term data are needed to evaluate climatic changes and their impact on ecosystems, but in areas as remote as the Tibetan Plateau, long term instrumental records of environmental change are geographically sparse and monitoring has only been undertaken in recent times. Paleolimnological approach might be then one of the few means by which environmental variability can be ascertained at scales that allow comparison with contemporary monitoring data and future model projections. Therefore, a paleolimnological study was undertaken in eight different lakes sampled along a North–South transect across the Tibetan Plateau analysing geochemistry and algal pigment in order to assess longer term variability in the trophic condition of these systems and their potential to reconstruct changes in relation to recent climate evolution and possible human impacts. Chronologies for the last century were based on radiometric techniques 210Pb, 241Am and 137Cs . Results show that inorganic sediment dominates the composition of the cores used in this study. Organic carbon constitutes less than 5% d.w. in all the lake cores, except for Kemen Co core where concentrations up to 14% d.w., are observed. Corg N ratios are generally in the order of 5–10, indicating that autochthonous algal production is the principal biological source of organic matter. Pigment preservation is generally good throughout the cores from all lakes as shown by the 430 410 nm ratio that is generally around 1.0 or higher. Six out of eight lakes show an increase in primary production in recent times. High pre 1800 AD pigment concentrations were detected only in Qinghai Lake. Since most of the lakes show a similar behaviour in the most recent section of the core, we interpret this as a response to climate and land use changes that have increased autochthonous production throughout the Tibetan Plateau. 648 Sedimentary evidence for recent increases in production in Tibetan plateau lakes Lami_2010_Tibet_Hydrobiol_spIssue.pdf Articolo in rivista Kluwer Academic Publishers 0018 8158 Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia. The Hague. Print Hydrobiologia Dordrecht The Hague. Print Hydrobiologia Boston The Hague. Print Hydrobiologia London The Hague. Print simona.musazzi MUSAZZI SIMONA GERLI STEFANO piero.guilizzoni GUILIZZONI PIERO andrea.lami LAMI ANDREA TA.P02.026.002 Limnologia e paleolimnologia di laghi di alta quota