Mercury cycling and sequestration in salt marshes sediments: an ecosystem service provided by Juncus maritimus and Scirpus maritimus
2011
Marques, B. | Lillebo, A. I. | Pereira, E. | Duarte, A. C.
In this study two time scales were looked at: a yearlong study was completed, and a 180-day decay experiment was done. Juncus maritimus and Scirpus maritimus have different life cycles, and this seems to have implications in the Hg-contaminated salt marsh sediment chemical environment, namely Eh and pH. In addition, the belowground biomass decomposition rates were faster for J. maritimus, as well as the biomass turnover rates. Results show that all these species-specific factors have implications in the mercury dynamics and sequestration. Meaning that J. maritimus belowground biomass has a sequestration capacity for mercury per square metre approximately 4–5 times higher than S. maritimus, i.e., in S. maritimus colonized areas Hg is more extensively exchange between belowground biomass and the rhizosediment. In conclusion, J. maritimus seems to provide a comparatively higher ecosystem service through phytostabilization (Hg complexation in the rhizosediment) and through phytoaccumulation (Hg sequestration in the belowground biomass).
Show more [+] Less [-]The Portuguese Foundation for Science and Technology (FCT) supported this study through the project PTDC/MAR/67752/2006; FCOMP-01-0124-FEDER-007378. The authors thank Bruno Galinho Henriques for his assistance with laboratory analyses. FCT funding through CESAM (Centre for Environmental and Marine Studies) is also acknowledged.
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