Table 2.
Basic information on water depth, the grain size distribution, total organic carbon (TOC) and carbon isotope compositions, and lipids of surface sediments from river bed and the estuary of the Pearl River.
| Sample† | Water depth (m) | pH | Sal. (%) | Sediment grain sizes |
TOC |
Core-bGDGTs |
Polar-bGDGTs |
P/(P + C) |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sand (%) | Silt (%) | Clay (%) | TOC (%) | δ13 CTOC (%) | Sonication |
BD |
Sonication |
BD |
Sonication (%) | BD (%) | ||||||||
| ng/g | μg/g TOC | ng/g | μg/g TOC | ng/g | μg/g TOC | ng/g | μg/g TOC | |||||||||||
| LOWER PR | ||||||||||||||||||
| PR-sedi-9 | 15 | 7.45 | 3.6 | 14.5 | 70.1 | 15.4 | 2.0 | −25.69 | 368.8 | 18.1 | 630.3 | 31.0 | 52.7 | 2.6 | 34.9 | 1.7 | 12.5 | 5.2 |
| PR-sedi-8 | >4 | 7.43 | 4.0 | 35.6 | 53.2 | 11.2 | 2.1 | −25.61 | 323.0 | 15.2 | 442.7 | 20.8 | 10.5 | 0.5 | 27.0 | 1.3 | 3.1 | 5.8 |
| PR-sedi-10 | 7 | 7.44 | 3.9 | 12.2 | 72.2 | 15.4 | 2.3 | −25.43 | 335.5 | 14.8 | 561.8 | 24.8 | 23.6 | 1.0 | 37.3 | 1.6 | 6.6 | 6.2 |
| PR-sedi-7 | 7 | 7.36 | 3.5 | 21.5 | 64.0 | 14.4 | 2.4 | −25.83 | 328.2 | 13.5 | 239.6 | 9.8 | 19.4 | 0.8 | 33.5 | 1.4 | 5.6 | 12.3 |
| PR-sedi-6 | 8 | 6.93 | 4.0 | 35.7 | 52.3 | 12.0 | 1.1 | −25.70 | 166.7 | 15.6 | 355.2 | 33.2 | 2.2 | 0.2 | 46.7 | 4.4 | 1.3 | 11.6 |
| PR-sedi-5 | 12 | 7.04 | 4.0 | 49.2 | 41.7 | 9.0 | 0.8 | −25.83 | 115.5 | 15.3 | 76.3 | 10.1 | 9.8 | 1.3 | 27.7 | 3.7 | 7.8 | 26.6 |
| PR-sedi-4‡ | 12 | 7.96 | 3.2 | 92.3 | 6.1 | 1.6 | 3.7 | −14.96 | 9.2 | 0.3 | 35.8 | 1.0 | 28.6 | 0.8 | 6.4 | 0.2 | 75.6 | 15.1 |
| PR-sedi-3 | 15 | 7.19 | 4.5 | 45.9 | 43.4 | 10.7 | 0.9 | −25.12 | 114.3 | 13.2 | 216.5 | 24.9 | 6.0 | 0.7 | 36.4 | 4.2 | 5.0 | 14.4 |
| PR-sedi-2 | 3 | 7.54 | 5.1 | 71.3 | 23.5 | 5.2 | 0.7 | −24.77 | 92.0 | 13.3 | 49.8 | 7.2 | 13.2 | 1.9 | 19.8 | 2.9 | 12.6 | 28.5 |
| PR-sedi-1 | 8 | 7.30 | 8.0 | 10.5 | 75.4 | 14.1 | 1.5 | −25.24 | 189.9 | 13.0 | 184.1 | 12.6 | 16.0 | 1.1 | 39.3 | 2.7 | 7.8 | 17.6 |
| Avg | 7.3 | 4.5 | 32.9 | 55.1 | 12.0 | 1.5 | −25.5 | 226.0 | 14.7 | 306.2 | 19.4 | 17.1 | 1.1 | 33.6 | 2.6 | 6.9 | 14.2 | |
| Std | 0.2 | 1.4 | 20.4 | 17.1 | 3.4 | 0.7 | 0.4 | 111.6 | 1.7 | 205.4 | 9.7 | 14.9 | 0.7 | 7.9 | 1.2 | 3.8 | 8.6 | |
| ESTUARY | ||||||||||||||||||
| PR-sedi-11 | 5 | 8.03 | 4.8 | 66.6 | 27.8 | 5.6 | 0.4 | −25.44 | 40.1 | 9.7 | 35.57 | 8.6 | 5.7 | 1.4 | 8.5 | 2.1 | 12.5 | 19.2 |
| PR-sedi-12 | 10 | 7.79 | 22.3 | 31.0 | 56.6 | 12.4 | 1.2 | −23.29 | 97.9 | 7.9 | 175.44 | 14.2 | 17.2 | 1.4 | 24.1 | 1.9 | 14.9 | 12.1 |
| PR-sedi-14 | 18 | 7.82 | 31.2 | 11.5 | 74.5 | 14.0 | 0.9 | −22.37 | 65.9 | 7.2 | 149.93 | 16.3 | 23.3 | 2.5 | 22.9 | 2.5 | 26.1 | 13.2 |
| Avg | 7.88 | 19.4 | 36.4 | 52.9 | 10.7 | 0.9 | −23.70 | 68.0 | 8.3 | 120.3 | 13.0 | 15.4 | 1.8 | 18.5 | 2.2 | 17.9 | 14.8 | |
| Std | 0.13 | 13.4 | 27.9 | 23.6 | 4.4 | 0.4 | 1.58 | 29.0 | 1.3 | 74.5 | 4.0 | 8.9 | 0.7 | 8.7 | 0.3 | 7.3 | 3.8 | |
Note that the unit is ng/g sediment and μg/g TOC. bGDGTs, branched glycerol dialkyl glycerol tetraethers. Core (C)-bGDGTs and polar (P)-bGDGTs are presented for two extraction methods: sonication and Bligh and Dyer (BD).
†PR-Sedi., Pearl River-sediment, which is followed by station number (solid circle in Figure 1).
‡PR-sedi-4 stood out as an exceptional sample because of its much higher δ13C of TOC and was excluded in the calculation of average values of all parameters.