Spatiotemporal variations in the organic carbon accumulation rate in mangrove sediments from the Yingluo Bay, China, since 1900
Abstract: Mangroves can not only provide multiple ecosystem service functions, but are also efficient carbon producers, capturers, and sinks. The estimation of the organic carbon accumulation rate (OCAR) in mangrove sediments is fundamental for elucidating the role of mangroves in the global carbon budget. In particular, understanding the past changes in the OCAR in mangrove sediments is vital for predicting the future role of mangroves in the rapidly changing environment. In this study, three dated sediment cores from interior and fringe of mangroves in the Yingluo Bay, China, were used to reconstruct the spatiotemporal variations of the calculated OCAR since 1900 in this area. The increasing OCAR in the mangrove interior was attributed to mangrove flourishment induced by climate change characterized by the rising temperature. However, in the mangrove fringe, the strengthening hydrodynamic conditions under the sea level rise were responsible for the decreasing OCAR, particularly after the 1940s. Furthermore, the duration of inundation by seawater was the primary factors controlling the spatial variability of the OCAR from the mangrove fringe to interior, while the strengthened hydrodynamic conditions after the 1940s broke this original pattern.
Figure 7. Variations and comparison of the organic carbon accumulation rate (OCAR) and contribution of mangrove derived organic carbon (CMOC) in the sediment cores (a–c), mangrove pollen content (Xia et al., 2015) (d), annual average air temperature and average rainfall of Guangxi Province (e and g) and average air temperature of Beihai City (f) (Huang et al., 2007), coefficient of grain size variation (100CV) of mangrove fringe (YLB02) (h), and sea level changes in the study region (i) (Frederikse, et al., 2020) since 1900. The blue shaded area represents the range of sea-level change. The solid lines in panels e, f, and g represent the 5 a moving averages of the original data sets. The grey dashed lines are linear regression of the corresponding data sets.
Figure 8. Bivariate plots of the organic carbon accumulation rate (OCAR) vs. the contribution of mangrove-derived organic carbon (CMOC) and coefficient of grain size variation (100CV) in sediment cores of YLB01 (a and d), YLB02 (b and e), and YLB03 (c and f). The dashed lines and shaded areas represent the 95% confidence intervals.
Table 1. Basic information of mangrove sediment cores in the Yingluo Bay, tropical China
Sites Latitude Longitude Length
Geomorphic setting Mangrove species YLB01 21°29′49″N 109°45′36″E 66 Interior upper tidal flat near the tidal creek Rhizophora stylosa;
YLB02 21°29′39″N 109°45′48″E 88 Fringe middle tidal flat near the trunk of the tidal creek Kandelia candel;
YLB03 21°29′53″N 109°45′38″E 50 Interior upper tidal flat near the land Bruguiera gymnorrhiza;
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