Isotopes and N-alkane Characteristics for Assessing Source of Sedimentary Organic Matter in the Lower Leaches of Yangtze River

摘要

The contribution of terrestrial C_3 plants ranged from 41% to 95%. The sedimentary OM was mainly derived from terrestrial higher plants with C3 metabolism. Increased human activities enhanced the OM inputs and deposition in the watershed, resulting in much worse ecosystem in the past decades.