Table 3 Sequestered CO2 stocks (negative values), cumulative GHG emissions, and the net GHG benefit from the South Bay meadow in 2013 and in 2016; all values are Mt CO2 equivalent units. Gross values = observed seagrass meadow-scale stocks; net values = seagrass meadow stock enhancement above the baseline (gross seagrass stocks – equivalent area bare stocks; aboveground biomass - AGB, belowground biomass - BGB); standard errors reflect error propagation.
From: The greenhouse gas offset potential from seagrass restoration
2001 Start (Bare) | 2013 Gross | 2013 Net | 2016 Gross | 2016 Net | |
|---|---|---|---|---|---|
Meadow area (km2) | 0.096 | 5.79 | 5.79 | 6.86 | 6.86 |
AGB | 0 | −710 ± 14.8 | −710 ± 14.8 | −810 ± 17.6 | −810 ± 17.6 |
Live BGB | 0 | −339 ± 30.0 | −339 ± 30.0 | −401 ± 33.2 | −401 ± 33.2 |
Dead BGB | 0 | −857 ± 44.3 | −857 ± 44.3 | −1020 ± 52.5 | −1020 ± 52.5 |
Sediment Corg | −78 ± 6.29a | −13500 ± 792 | −4150 ± 412 | −20400 ± 3440 | −7360 ± 1790 |
Total GHG Benefit | −6060 | −9590 | |||
CH4 | 0.5 ± 0.20 | 385 ± 177 | 335 ± 156 | 611 ± 275 | 532 ± 249 |
N2O | 1.5 ± 0.64 | 420 ± 152 | 264 ± 84.6 | 667 ± 243 | 420 ± 134 |
CO2 from CaCO3 | 3.8 ± 1.14 | 450 ± 137b | 0c | 623 ± 190c | 0c |
Total Emissions | 5.7 | 1260 | 599 | 1780 | 952 |
Net GHG benefit | −5460 | −8630 |
