Table 1.
Characteristics of the added OC and sediment.
| TC (%)a | TN (%)a | C/N | δ13C‐OC (‰)a | Quantity (mg C) in the mixturesb | Quantity of added OC/quantity of sediment OC | |
|---|---|---|---|---|---|---|
| S. auriculata | 34.8 | 1.7 | 20.5 | −28.9 | 40.6 ± 1.3 | 1.9 |
| N. indica | 41.0 | 1.0 | 40.0 | −27.8 | 27.3 ± 0.9 | 1.3 |
| Phytoplankton | 44.8 | 8.4 | 5.4 | −16.8 | 18.6 ± 0.6 | 0.9 |
| Terrestrial leaves | 45.2 | 1.1 | 41.1 | −30.5 | 32.4 ± 4.8 | 1.1 |
| Sediment | 2.2 | 0.2 | 10.6 | −22.8 | 24.4 ± 4.2 | — |
For sediment, δ13C‐OC was equivalent to δ13C of TC because solid carbonate content was negligible.
a
n = 4 for sediment (the sediment sampled in April and in March are pooled in this table because of their similar characteristics), n = 2 for phytoplankton and terrestrial leaves, and n = 1 for N. indica and S. auriculata. The maximum standard errors were 0.6% for TC, 0.06% for TN, and 0.6 for δ13C‐OC.
b
Mean ± SD.