Figure 1.
Vertical average down-core profiles of sediment characteristics in the top 10 cm.
A) Percent organic matter (% OM); B) Percent organic carbon (% C); C) Percent nitrogen (% N) for 4 age treatments (0- (HI), 4-, 0- (SB), and 10-year) in top 10 cm of sediment, where error bars indicate standard error. Averages for each variable were calculated in 1-cm intervals to a depth of 10 cm.
Figure 2.
Total down core 210Pb activity for all treatments.
A) Total down core 210Pb activity in Hog Island treatments, 0-year (HI) and 4-year. There was no significant 210Pb activity to determine sedimentation rate throughout the core. B) Total down core 210Pb activity in South Bay treatments, 0-year (SB) and 10-year. There was significant 210Pb activity in the 10-year treatment above 10 cm depth, allowing for the determination of a sedimentation rate. Error in each measurement was not significant due to low instrumental error.
Figure 3.
Record of sediment accretion rate, percent organic carbon, and carbon burial rate in 10-year treatment.
A) Historical record in the 10-year treatment (SB) of sediment accretion rate, percent organic carbon, and carbon burial rate with years before present starting in 2011 (= 0 on x-axis). B) Recent record in the 10-year treatment of sediment accretion rate, percent organic carbon, and carbon burial rate with years before present starting in 2011. Time influenced by seagrass restoration (10 years) is enclosed in box with grey diagonal lines. The vertical, grey hyphenated line at 5 years before present indicates the end of the 5-year lag period, where before there was little change in carbon burial rates due to low seagrass density.