中国地理科学(英文版) ›› 2010, Vol. 20 ›› Issue (3): 202-208.doi: 10.1007/s11769-010-0202-1

• 论文 • 上一篇    下一篇

Chronology and Nutrients Change in Recent Sediment of Taihu Lake, Lower Changjiang River Basin, East China

YAO Shuchun1, XUE Bin1, KONG Deyang2   

  1. 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 Sciences, Ministry of Environmental Protection, Nanjing 210042, China
  • 收稿日期:2009-10-21 修回日期:2010-01-29 出版日期:2010-04-01 发布日期:2010-04-23
  • 通讯作者: XUE Bin.E-mail:bxue@niglas.ac.cn E-mail:bxue@niglas.ac.cn
  • 基金资助:

    Under the auspices of National Key Science and Technology Special Program of Water Pollution Control and Treatment (No.2008ZX07101-012-01);National Natural Science Foundation of China (No.40902048, 40771197);Jiangsu Natural Sci-ence Foundation (No.BK2009331, BE2008690)

Chronology and Nutrients Change in Recent Sediment of Taihu Lake, Lower Changjiang River Basin, East China

YAO Shuchun1, XUE Bin1, KONG Deyang2   

  1. 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 Sciences, Ministry of Environmental Protection, Nanjing 210042, China
  • Received:2009-10-21 Revised:2010-01-29 Online:2010-04-01 Published:2010-04-23
  • Supported by:

    Under the auspices of National Key Science and Technology Special Program of Water Pollution Control and Treatment (No.2008ZX07101-012-01);National Natural Science Foundation of China (No.40902048, 40771197);Jiangsu Natural Sci-ence Foundation (No.BK2009331, BE2008690)

摘要:

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 g/(cm2·yr) to 0.76 g/(cm2·yr) in the ZS core,and from 0.10 g/(cm2·yr) to 0.56 g/(cm2·yr) in the THS core.A remarkable 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.

关键词: 210Pb, 137Cs, Taihu Lake, nutrient, sediment

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 g/(cm2·yr) to 0.76 g/(cm2·yr) in the ZS core,and from 0.10 g/(cm2·yr) to 0.56 g/(cm2·yr) in the THS core.A remarkable 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.

Key words: 210Pb, 137Cs, Taihu Lake, nutrient, sediment