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| 1 | Sudden enhancement of sedimentation flux of^(210)Pb_(ex) as anindicator of lake productivity as exemplified by Lake Chenghai显示文摘The fundamental assumption of 210Pbsediment dating is the stable flux of 210Pbse, which was derived from atmosphere and then transferred into sediments via lake water. When the sedimentation rate is relatively constant, the 210Pbse activity in sediments will be exponentially reduced with sedimentation age. 210Pbse in lake water is incorporated into sediments mainly via organic particulates. If the sedimentation flux of organic matter in lake water is suddenly in- creased, 210Pbse will be significantly deposited and then transferred into sediments. On the one hand such sudden purification effect is obviously unfit for the fundamental assumption of 210Pbse dating; on the other hand, the sudden enhancement of 210Pbse flux would be indicative of the conspicuous variation of primary productivity of lake water. This problem will be discussed in accordance with the variation trend of 210Pbex in the vertical profile of recent sediments of Lake Chenghai, Yunnan Province. The sediment core was collected from the deep-water area of Lake Chenghai in June 1997. The vertical profile of 137 Cs activity is characterized by a tree-peak pat- tern. This profile gave reliable ages, and also showed the stability of sediment accumulation in the recent ten years. The vertical profile of210Pbse activity displays a specific distribution of peaks, and is similar to the vertical profile of Corg. This phenomenon seems to be related to the mecha- nism of constraining the transfer of 210Pbse into lake sediments. The average atomic ratios of Horg/Corg and Corg/Norg in Lake Chenghai sediments are 5.51 and 7.04, respectively, indicating that the organic matter was predominantly derived from the remains of endogenic algae. In terms of the three-stage evolutionary characteristics of organic matter in sediments, i.e., “deposition-de- composition-accumulation”, the sedimentation fluxes (F(Corg)) of organic carbon (Corg) since 1970 were calculated by modeling. The sedimentation fluxes of 210Pbse (F(210Pbse)) in different years display good synchronous relations with the sedimentation flux of organic carbon (F(Corg)), es- pecially in the years of 1972─1974 and 1986─1989. The variation of F(Corg) led to the variation of F(210Pbse); the variation of F(210Pbex) reflects, to some extent, the historical variation of lake pro- ductivity. | P. H. Santschi | 2005 | Science China Earth Sciences2005，48，4： | 3 |
| 2 | Importance of acid polysaccharides for 234Th complexation to marine organic matter显示文摘 | Quigley M S Santschi P H Hung C C | 2002 | Limnology and Oceanography2002，47，： | 1 |
| 3 | 2a4Th scavenging and its relationship to acid polysaccharide abundance in the Gulf of Mexico显示文摘 | GUO L HUNG C C SANTSCHI P H | 2002 | Marine Chemistry2002，78，23： | 1 |
| 4 | Natural (210pb,7Be) and fallout (137Cs,239,240pu,90Sr) radionuclides as geochemical methods of sedimentation in Greifensee,Switzerland显示文摘 | Wan Guojiang Santschi P H Strum M | 1987 | Chem Geol1987，63，： | 1 |
| 5 | The distribution of colloidal and dissolved organic carbon in the Gulf of Mexico显示文摘 | GUO L D COLEMAN Jr C H SANTSCHI P H | 1994 | Marine Chemistry1994，45，： | 1 |
| 6 | Importance of acid polysaccharides for 234Th complexation to marine organic mat ter显示文摘 | QUIGLEY M S SANTSCHI P H HUNG C C | 2002 | Limnology and Oceanography2002，47，2： | 1 |
| 7 | Apparent ruminal synthesis and intestinal disappearance of vitamin B12 and its analogs in dairy cows 显示文摘 | Girard C L D E Santschi S P Stabler | 2009 | J Dairy Sci2009，92，9： | 1 |
| 8 | Activation of receptors negatively coupled to adenylate cyclase is required for induction of long- term synaptic depression at Schaffer collateral-CA1 synapses显示文摘 | Santschi LA Zhang XL Stanton PK | 2006 | J Neurobiol2006，66，： | 1 |
| 9 | Distributions of carbohydrate species in the Gulf of Mexico 显示文摘 | Hung C C Guo L Santschi | 2003 | Mar Chem2003，81，： | 1 |
| 10 | Sensitive determination of iodine species, including the organo-iodine, for freshwater and seawater samples using high performance liquid chromatography and spectrophotometric detection显示文摘 | Schwehr K A Santschi P H | 2003 | Analytica Chimica Acta2003，482，： | 1 |
| 11 | Isotopic and elemental characterization of colloidal organic matter from the Chesapeake Bay and Galveston Bay显示文摘 | Guo L D Santschi P H | 1997 | Marine Chemistry1997，59，12： | 1 |
| 12 | Chemical processes at the sediment-water interface 显示文摘 | SANTSCHI P HOHENER P BENOIT G | 1990 | Marine Chemistry1990，30，： | 1 |
| 13 | Polycyclic aromatic hydrocarbons in surface sediments of the East China Sea and their relationship with carbonaceous materials显示文摘 | Chin-Chang Hung Gwo-Ching Gong Fung-Chi Ko Hung-Jen Lee Hung-Yu Chen Jian-Ming Wu Min-Lan Hsu Sen-Chueh Peng Fan-Hua Nan Peter H. Santschi | 2011 | Marine Pollution Bulletin2011，，5： | 1 |
| 14 | Chemical processes at the sediment-water interface显示文摘 | Santschi P H H(o)ehener P Benoit G Brink M B | 1990 | Mar Chem1990，30，： | 1 |
| 15 | Thorium sorption in the marine environment: Equilibrium partitioning at the hematite/water interface, sorption/desorption kinetics and particle tracing显示文摘 | Matthew S. Quigley Bruce D. Honeyman Peter H. Santschi | 1995 | Aquatic Geochemistry1995，，3： | 1 |
| 16 | Trace metal composition of colloidal organic material in marine environments显示文摘 | Santschi P H Warnken K W | 2000 | Marine Chemistry2000，70，： | 1 |
| 17 | Seat - belt injuries in children involved in motor vehicle crashes显示文摘 | Santschi M Echav6 V Laflamme S | 2005 | Can J Surg2005，48，： | 1 |
| 18 | Scavenging of chernobyl 137Cs and natural 210Pb in lake Sempach,Switzerland显示文摘 | Wieland E Santschi P H Hhener P | 1993 | Geochimica et Cosmochimica Acta1993，57，： | 1 |
| 19 | Fabrica- tion and functionalization of Nanochannels by electron beam induced silicon oxide deposition 显示文摘 | DANELON C SANTSCHI C BRUGGER J | 2006 | Langmuir2006，22，10： | 1 |
| 20 | Effect of dissolved organic matter on the uptake of trace metals by american oysters 显示文摘 | Guo L D Hunt B J Santschi P H | 2001 | Environmental Science & Technology2001，35，5： | 1 |
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