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Fig. 1 Study area, showing the Pearl River delta and estuary in the East Asian area (a) and sampling sites (b). There is no surface sediment from site PE43 and no winter POC from site PE76 and 77. ‘PE’ stands for the ‘Pearl River estuary’.
Fig. 2 Clustering groups for the estuarine surface sediment samples and POC samples identified by winter salinity and sand concentration. Groups G1-G3 are from freshwater areas; groups G4-G7 are from brackish areas and G8-G9 are from marine areas.
Fig. 3 Bi-plot of the δ13C and C/N of C3 and C4 plants. a: individual values for each plant with the average value of C3 and C4 plants; b: average values of different types of plants within the C3 and C4 groups (error bars are the standard deviation).
Fig. 4 Bi-plot of the δ13C and C/N of terrestrial soil samples. a: individual values for each soil sample; b: average values of different types of soil with stand deviation.
Fig. 5 Bi-plot of seasonal δ13C and C/N of the POC.
Fig. 6 A summarized bi-plot of seasonal δ13C and C/N (a: winter and b: summer) and bi-plot of seasonal δ13C and water salinity (c: winter and d: summer) of the POC for each group indentified by cluster analysis.
Fig. 7 Comparison δ13C and C/N values between the POC on 70 µm net and summer POC on filter paper.
Fig. 8 Bi-plot of the δ13C and C/N of surface sediment groups. a: scattering value of the individual sample; b:average δ13C and C/N values of the seven groups with standard deviation shown.
Table 1 Results of the plants samples and their sampling sites.
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