Multiple organic proxies and lipid biomarkers in the sediment core
samples collected from Luoma Lake and Hongze Lake in Jiangsu are used to
expound the relationships of global warming with lacustrine productivity
and depostion of polycyclic aromatic hydrocarbons. Total organic carbon,
S2, and hydrogen index in sedimentary organic matter were obtained with
the Rock-Eval analysis. Nutrient status such as total phosphorus and
total nitrogen was measured in the sediment cores. The source
apportionment modeling and statistical analyses demonstrated that algal
organic matter and bacteria organic matter showed an increasing trend
and an obvious enrichment effect on PAHs, which was also related to the
increasing temperature and algal productivity in the lakes. Global
warming enhanced the lacustrine productivity and the accumulation of
polycyclic aromatic hydrocarbons. The rapidly increasing ecological
risks of PAHs in LM and HZ indicated the impact of global warming and
human activities in the last 60 years. Therefore, the internal cycling
and the input of contaminants and nutrients in the lakes should be
controlled to reduce the algal growth in LM and HZ.