According to an analysis of the age data, granularity and magnetic in deposits of Chaohu Lake, and based on the foundation of chronological studying pole, core CH1 could be divided into 4 sedimentary chronological sections during the last 800 years:① 1177 A.D.to 1271 A.D., matched along with the records in deposits of the depth from 141 cm to 125 cm, is proven to be a wet /warm period and the lake level became higher.② 1271 A.D.to 1747 A.D., matched along with the records in deposits of the depth from 125 cm to 44 cm, is proven to be a stage in which the organic matter accumulated in a general wet environment.From 1477 A.D.to 1747 A.D.in this stage, the records in deposits of the depth from 90 cm to 44 cm, reflect the variable characteristics of climate during the Little Ice Age (LIA) in eastern China, which indicates a general wet environment despite of some dry/cold alternative action during the period, including the drought maximum of the oscillation in 1747 A.D.③ 1747 A.D.to 1865 A.D., matched along with the records in deposits of the depth from 44 cm to 24 cm, the last 100 years, still stayed in the LIA, but the climate of Chaohu Lake became warmer and the lake level uplifted.④ 1865 A.D.to the present, matched along with the records in deposits of the depth from 24 cm above, is proven to be a dry period and climate became drier.After the Enrichment Indices of the chemical elements and mineral nutrients content in the last 800 years are calculated by taking normalization, it is seen that the TOC/TN has increased with unnatural levels since the 1860s, while the TP has enriched with unnatural levels since the 1660s.These facts can reflect the environmental change impacted by human activities, and is also the evidence of the beginning of eutrophication during the history epoch in Chaohu Lake.
JIA Tie-fei, ZHANG Wei-guo, YU Li-zhong, YU Tie-qiao
. Characteristics of Nutrient Elements’Enrichment in Deposits of Chaohu Lake and Its Indication for Environmental Change During Last 800 Years[J]. SCIENTIA GEOGRAPHICA SINICA, 2009
, 29(6)
: 893
-899
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DOI: 10.13249/j.cnki.sgs.2009.06.893
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