Abstract
We investigated the spatiotemporal distribution of 137Cs radioactivity in surface sediment of Qinghai Lake, and developed the spatial pattern of sedimentation rate. The 137Cs inventory is higher near the estuary/bank area, but lower at the central lake. On the other hand, the average 137Cs activity is lower near the estuary/bank area, but higher at the central lake. The mass accumulation rate (MAR) and the fluxes and contents of the terrestrial detritus (e.g. SiO2, Fe2O3, and Ti) are higher near the estuary/bank area, but lower at the central lake. The chemical/biogenic deposits (e.g. the autogenic carbonates) take up higher fractions at the central lake. These suggest that the spatial pattern of recent sedimentation rate is dominated by the deposition of terrestrial detritus. The average MAR (0.0337g·cm−2·a−1) was estimated based on those of different cores of Qinghai Lake and was verified by a Ca mass-balance method. The fluxes of total lake sediments, terrestrial detritus, and direct atmospheric deposits were also estimated.
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References
He Q, Walling D E, Owens P N. Interpreting the 137Cs profiles ob- served in several small lakes and reservoirs in southern England. Chem Geol, 1996, 129: 115–131
Lu X X, Higgitt D L. Estimating erosion rates on sloping agricultural land in the Yangtze Three Gorges, China, from caesium-137 measurements. Catena, 2000, 39: 33–51
Lu X. Application of the Weibull extrapolation to 137Cs geochronology in Tokyo Bay and Ise Bay, Japan. J Environ Radioact, 2004, 73: 169–181
Bergan T D. Radioactive fallout in Norway from atmospheric nuclear weapons tests. J Environ Radioact, 2002, 60: 189–208
Abril J M. Constraints on the use of 137Cs as a time-marker to support CRS and SIT chronologies. Environ Pollut, 2004, 129: 31–37
Wan G J. Progresses on 137Cs and 210Pbex dating of lake sediments (in Chinese). Adv Earth Sci, 1995, 10: 188–192
Xu J Y, Wan G J, Wang C S, et al. Vertical distribution of 210Pb and 137Cs and their dating in recent sediments of Lugu Lake and Erhai Lake, Yunnan Province (in Chinese). J Lake Sci, 1999, 11: 110–116
Chu G Q, Gu Z Y, Xu B, et al. Varve chronology and radiometric dating (137Cs, 210Pb) from the Sihailongwan maar, northeastern China (in Chinese). Quat Sci, 2005, 25: 202–207
Xu H, Ai L, Tan L C, et al. Geochronology of a surface core in the northern basin of Lake Qinghai: Evidence from 210Pb and 137Cs radionuclides. Chin J Geochem, 2006, 25: 301–306
Huang Q. Sedimentation rate in Qinghai Lake and a pilot study of the paleoclimate (in Chinese). Chinese Sci Bull, 1988, 32: 1740–1744
Shen J, Zhang E L, Xia W L. Records from lake sediments of the Qinghai Lake to mirror climatic and environmental changes of the past about 1000 years (in Chinese). Quat Sci, 2001, 21: 508–513
Henderson A C G, Holmes J A, Zhang J W, et al. A carbon- and oxygen-isotope record of recent environmental change from Qinghai Lake, NE Tibetan Plateau. Chinese Sci Bull, 2003, 48: 1463–1468
Lan zhou Institute of Geology, Chinese Academy of Sciences. Qinghai Lake Monograph of the 1961 Expedition (in Chinese). Beijing: Science Press, 1979. 85
Han Y R. Environmental deterioration at Lake Qinghai and the protecting policy (in Chinese). Soil Water Conserv Chin, 2000, 8: 18–19
Yang X, Sun F, Ren N. The Eco-environmental problems and rehabilitation strategies in the area around Qinghai Lake (in Chinese). Areal Res Develop, 2003, 22: 39–42
Lanzhou Branch of Chinese Academy of Sciences. Evolution of Recent Environment in Qinghai Lake and Its Prediction (in Chinese). Beijing: Science Press, 1994
Xu H, Hou Z H, An Z S, et al. Major ion chemistry of waters in Lake Qinghai catchments, NE Qinghai-Tibet Plateau, China. Quat Int, doi:10.1016/j.quaint.2008.11.001
Fu J X, Zhang X B, Qi Y Q, et al. Penetration process model for 137Cs depth distribution in uncultivated soil without erosion (in Chinese). Nucl Tech, 2006, 29: 189–193
Wang F S, Liu C Q, Liang X B, et al. An experimental study on the remigration of some trace metals in lake sediments influenced by microbe (in Chinese). J Lake Sci, 2006, 18: 49–56
Cremers A, Elsen A, De Preter P, et al. Quantitative analysis of radio cesium retension in soil. Nature, 1988, 335: 247–249
Zapata F. Handbook for the Assessment of Soil Erosion and Sedimentation Using Environmental Radionuclides. Dordrecht/Boston/London: Kluwer Academic Publisher, 2002. 4
Zeng Y, Zhang X B, Zhou W J, et al. Source of 137Cs in Lake Qinghai (in Chinese). J Lake Sci, 2007, 19: 516–521
Yu J Q, Kelts K R. Abrupt changes in climatic conditions across the Late-glacial /Holocene transition on the N. E. Tibet-Qinghai Plateau: evidence from Lake Qinghai, China. J Paleolimnol, 2002, 28: 195–206
Gao H J, Li X Q, Zhang F, et al. Remote sensing monitory study on the dynamic change of ecological environment in Qinghai Lake area during 25 years (in Chinese). Chin J Geol Haz Contr, 2005, 16: 100–103
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This work was supported by the National Key Technology R & D Program (Grant No. 2007 BAC30B01) and West Light Foundation of the Chinese Academy of Sciences (Grant No. 2007ZD01).
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Xu, H., Liu, X., An, Z. et al. Spatial pattern of modern sedimentation rate of Qinghai Lake and a preliminary estimate of the sediment flux. Chin. Sci. Bull. 55, 621–627 (2010). https://doi.org/10.1007/s11434-009-0580-x
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DOI: https://doi.org/10.1007/s11434-009-0580-x