摘要
A 6.2 m thick core of Gucheng Lake sediment provided a 3600 years record of climate change. The contents of the TOC in the core changed from 2.63% to 8.48%, and the δ13C values of organic matter were from - 21.54% to - 27.3%. The TOC/TN ratios indicated that the organic materials in sediments were from lake plankton and land-derived plants.The 2.9-22 m core interval with high TOC/TN ratios, low δ13C values and low contents of TOC indicated a cold climate Stage. The 6.2-5.5 m and 0.4-0.1 m intervals were characterized by low TOC/TN ratios, highδ13C values and high contents of TOC and reflcted temperate climate stages.
A 6.2 m thick core of Gucheng Lake sediment provided a 3600 years record of climate change. The contents of the TOC in the core changed from 2.63% to 8.48%, and the δ13C values of organic matter were from - 21.54% to - 27.3%. The TOC/TN ratios indicated that the organic materials in sediments were from lake plankton and land-derived plants.The 2.9-22 m core interval with high TOC/TN ratios, low δ13C values and low contents of TOC indicated a cold climate Stage. The 6.2-5.5 m and 0.4-0.1 m intervals were characterized by low TOC/TN ratios, highδ13C values and high contents of TOC and reflcted temperate climate stages.
