Yong Ran
Guangzhou Institute of Geochemistry, CAS
China
Title: Effect of climate warming on neutral carbohydrates in sediment cores of subtropical reservoirs, South China
Biography
Biography: Yong Ran
Abstract
The relationships of neutral carbohydrates with algal organic matter (AOM)and climate change were investigated in three sediment cores of various trophic reservoirs. Neutral monosaccharides and AOM were determined respectively by high-performance anion-exchange chromatography with pulsed amperometric detection (HPAC-PAD) and by Rock-Eval analysis. Neutral sugar concentrations are strongly correlated with AOM in the mesotrophic reservoir cores, where glucose, mannose and galactose are the most abundant monosaccharides. Monosaccharide compositions and diagnostic parameters indicate a predominant contribution of phytoplankton in the mesotrophic reservoirs. The deposited neutral carbohydrates in sediment cores are largely structural polysaccharides derived from algal detritus, and are resistant to degradation. The increasing mean air temperature during the past 40 years has significant influences on the neutral carbohydrates and algal productivity at both meso-eutrophic reservoirs and oligotrophic reservoirs. The hydrogen index (HI) is observed to be a good indicator for monitoring historical changes of primary productivity in aquatic environments. The above evidence shows that even at low latitude regions, the primary productivity in subtropical reservoirs hasbeen significantly elevated by climate warming.
