(Table 6) Postulated scenarios explaining abundance of C4 plant material in sediments based on river discharge and wind trajectories and map of proportion (%) of continental vegetation using the C4 pathway

a Amount of C4 material in sediments (%); Calculation based on d13C31. b Amount of C4 material (%) contributed to sediments according to scenarios in this Table. Postulated scenarios explaining abundance of C4 plant material in sediments based on river discharge and wind trajectories (Dupont and Wyputta, 2003) and map of proportion (%) of continental vegetation using the C4 pathway (Still and Powell, 2010; Fig. 4).a 沉积物中C4物质（C4 material）占比（%）；计算依据为d¹³C₃₁。 b 本表格各情景下，贡献至沉积物的C4物质占比（%）。 基于河流径流量与风轨迹（Dupont与Wyputta，2003）构建的用以解释沉积物中C4植物物质（C4 plant material）丰度的假设情景，以及采用C4光合途径（C4 pathway）的陆地植被占比分布图（Still与Powell，2010；图4）。