Chronology and nutrients change in recent sediment of Taihu Lake,lower Changjiang River Basin,east China |
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| Authors: | Shuchun Yao Bin Xue Deyang Kong |
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| Institution: | [1]State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences, Nanjing 210008, China [2]Nanjing Institute of Environmental Seiences,Ministry of Environmental Protection, Nanjing 210042, China |
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| Abstract: | Two short sediment cores named ZS and THS dated by the 210Pb or 137Cs method were collected from the northwest and southwest of Taihu Lake respectivly, and total organic carbon (TOC) and nutrients including total nitrogen (TN) and total phosphorus (TP) were determined to analyze the chronology and nutrients change in recent sediment. The results show that 137Cs activities are low (less than 15 Bq/kg) in the two cores, attributed to the 137Cs migration. Based on 210Pb constant rate of supply (CRS) model, the sedimentation accumulation rates range from 0.13 increase in organic matter and nutrients has occurred in the two dated cores since the mid-1980s. The historical changes of organic matter and nutrients in the two cores are consisitent with the monitoring data for surface sediment after the 1960s. The TP accumulation rates after the early 1980s are 0.97 and 0.92 times higher than those from the 1950s to the 1980s in ZS and THS cores, respectively. Higher TP concentrations in the past two-decade deposits of Taihu Lake are due to both diagenetic factors and human activities. |
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| Keywords: | 210Pb 137Cs Taihu Lake nutrient sediment |
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