1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China, Postgraduate Research Institute of Sedimentology, The University of Reading, Reading RG6 6AB, U.K., Centre for Ecology and Hydrology, NERC, Dorset, U.K., Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Faculty of Science and Technology, Macao University, Macao