Sedimentary evidence for recent increases in production in Tibetan plateau lakes

作者: Andrea Lami , Simon Turner , Simona Musazzi , Stefano Gerli , Piero Guilizzoni

DOI: 10.1007/S10750-010-0263-2

关键词: EcosystemClimate changePlateauEcologyTransectSedimentEnvironmental scienceTrophic levelPhysical geographyMonsoonEnvironmental change

摘要: 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 ice. It occupies climatic transition zone between Asian monsoons westerly airflow. As result this location, region sensitive to changes climate on timescales decades millennia longer. Long-term data are needed evaluate their impact ecosystems, but areas as remote Plateau, long-term instrumental records environmental change geographically sparse monitoring has only been undertaken recent times. Paleolimnological approach might be then one few means by which variability can ascertained at scales that allow comparison contemporary future model projections. Therefore, paleolimnological study was eight different lakes sampled along North–South transect across analysing geochemistry algal pigment order assess longer term trophic condition these systems potential reconstruct relation evolution possible human impacts. Chronologies for last century were based radiometric techniques (210Pb, 241Am 137Cs). Results show inorganic sediment dominates composition cores used study. Organic carbon constitutes less than 5% d.w. all lake cores, except Kemen Co core where concentrations up 14% d.w., observed. Corg:N ratios generally 5–10, indicating autochthonous production principal biological source organic matter. Pigment preservation good throughout from shown 430:410 nm ratio around 1.0 or higher. Six out increase primary High pre-1800 AD detected Qinghai Lake. Since most similar behaviour section core, we interpret response land-use have increased Plateau.

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