210Pb-derived Sedimentation Rates and Corg Fluxes in Soledad Lagoon (Cispatá Lagoon System, NW Caribbean Coast of Colombia)

Abstract

With the aim of evaluating temporal changes in sedimentation and organic carbon (C org ) supplied over the last~100 years, a sediment core was collected at Soledad Lagoon, a costal ecosystem surrounded by mangroves, located in the Cispatá Estuary (Caribbean coast of Colombia). The core sediments were characterized by low concentrations of calcium carbonate (0.2-2.9%), organic matter (3-8%), total nitrogen (0.11-0.38%), and total phosphorus (0.19-0.65 mg g −1 ). Fe and Al concentrations ranged from 4% to 5%, and Mn from 356 to 1,047 μg g −1 .The 210 Pb-derived sediment and mass accumulation rates were 1.54±0.18 mm year −1 and 0.08±0.01 gcm −2 year −1 , respectively. The sediment core did not provide evidence of human impact, such as enhancement of primary production or nutrient enrichment, which may result from recent land uses changes or climate change. The C org fluxes estimated for Soledad Lagoon core lay in the higher side of carbon fluxes to coastal ecosystems (314-409 gm −2 year −1 ) and the relatively high C org preservation observed (~45%) indicate that these lagoon sediments has been a net and efficient sink of C org during the last century, which corroborate the importance of mangrove areas as important sites for carbon burial and therefore, long-term sequestration of C org .

Organic carbon burial rates in mangrove sediments: Strengthening the global budget

“… a Sources: 1, Gonneea et al [2004]; 2, Sanders et al [2006]; 3, Sanders et al [2008]; 4, Sanders et al [2010a]; 5, Sanders et al [2010b]; 6, Alongi et al [1999]; 7, Ruiz‐Fernández et al [2011]; 8, Harmon [2011]. …”

“…If a paper reported only the range of mean burial rates for multiple cores but not a mean value for individual cores, then only the upper and lower values were used here [e.g., Tateda et al , 2005]. Additionally, in the event that a range of burial rates was given for a single core, the midpoint of the two values was used as a functional mean [e.g., Ruiz ‐ Fernández et al , 2011]. When organic matter (OM) was reported, that value was multiplied by 0.58 after Allen [1974] to estimate the OC content.…”

The Impact of Climate Change on Mangrove Forests

“…The sea level rise data are from satellite altimetry data available on the website: http://www.nodc.noaa.gov/ General/sealevel.html. Mangrove sedimentation data are from references in Alongi [2] and updated with more recent data [88][89][90][91][92][93][94][95][96][97][98][99][100].…”

Intertwined effects of climate and land use change on environmental dynamics and carbon accumulation in a mangrove‐fringed coastal lagoon in Java, Indonesia

“…The Soledad Lagoon in Colombia, on the other hand, accumulated over two times more carbon than the SAL during the last century (Figure ). Based on its geomorphology, the Soledad Lagoon can be defined as a choked lagoon (Kjerfve, ), as it only occasionally receives river water input (Ruiz‐Fernández, Marrugo‐Negrete, Paternina‐Uribe, & Pérez‐Bernal, ). Thus, it likely has a long water residence time and restricted tidal or river energy influence.…”