Table 1 Biogeochemical properties examined along the sediment depth and across accumulation periods in the three saltmarsh sediment cores analyzed (BS2A1, BSA2 and BSA3).
From: Coastal engineering infrastructure impacts Blue Carbon habitats distribution and ecosystem functions
CORE | Variable | All core | After bridge (1978–2019; 0–3 cm depth) | Before bridge (1907–1978; > 3 cm depth) | ||
|---|---|---|---|---|---|---|
Mean ± se (n) | Min–Max | Mean ± se (n) | Min–Max | |||
BS2A1 | DBD (g cm−3) | 1.32 ± 0.07 (31) | 0.39 ± 0.03 (3) | 0.36–0.46 | 1.42 ± 0.05 (28) | 0.87–1.75 |
TOC (%DW) | 1.94 ± 0.4 (21) | 9.4 ± 1.5 (3) | 6.7–11.8 | 0.71 ± 0.13 (18) | 0.1–1.9 | |
Mean grain size (µm) | 243 ± 44 (10) | 16.5 (2) | 15.1–17.9 | 299 ± 29 (8) | 127–372 | |
Silt & Clay (%) | 31 ± 11 (10) | 94 (2) | 93–95 | 15 ± 5 (8) | 1.6–46.7 | |
Sand (%) | 69 ± 11 (10) | 6.2 (2) | 5.3–7.1 | 85 ± 5 (8) | 53–98 | |
SAR (cm y−1) | 0.13 ± 0.01 (13) | 0.08 ± 0.02 (4) | 0.04–0.14 | 0.15 ± 0.01 (9) | 0.10–0.20 | |
Corg burial (mg cm−2 y−1) | 1.7 ± 0.21 (13) | 2.5 ± 0.3 (4) | 1.7–3.0 | 1.3 ± 0.2 (9) | 0.4–2.0 | |
δ13C (%) | − 24.3 ± 0.3 (17) | − 26.34 ± 0.03 (3) | − 26.4–(− 26.3) | − 23.8 ± 0.2 (14) | − 24.9(–)− 22.9 | |
BS2A2 | DBD (g cm−3) | 1.1 ± 0.1 (12) | 0.6 (2) | 0.58–0.62 | 1.1 ± 0.1 (11) | 0.58–1.53 |
TOC (%DW) | 1.4 ± 0.4 (11) | 3.5 (2) | 2.4–4.5 | 1.1 ± 0.2 (10) | 0.4–2.4 | |
BS2A3 | DBD (g cm−3) | 1.3 ± 0.1 (13) | 0.9 (2) | 0.52–1.18 | 1.4 ± 0.08 (12) | 0.94–1.93 |
TOC (%DW) | 1.3 ± 0.6 (11) | 4.5 (2) | 1.4–7.5 | 0.7 ± 0.1 (10) | 0.1–1.4 | |
