Abstract

CAMACHO-RICO, Andrea; HERRERA-SILVEIRA, Jorge; CAAMAL-SOSA, Juan Pablo  and  TEUTLI-HERNANDEZ, Claudia. Influence of salinity in the carbon storage and fluxes in fringe mangroves of a karstic zone. Madera bosques [online]. 2021, vol.27, n.spe, e2742426.  Epub Feb 21, 2022. ISSN 2448-7597.  https://doi.org/10.21829/myb.2021.2742426.

In mangroves as well as in other forest ecosystems, the importance of assessing carbon storage and flows is recognized by the contribution that they may have in mitigation of the effects of CO2 emissions. This study evaluated the relationship between salinity as a hydrological controller and the carbon storages and flows in fringe mangroves of a geomorphologic karstic scenario with saline gradient like that of the Celestún lagoon. Two sampling sites were established in the fringe mangrove, one in the low salinity zone (< 20 psu, internal) and the other in the high salinity zone (> 40 psu, mouth). The structure of the vegetation between sites is different; the dominant species of man-grove in the zone of lower salinity was Laguncularia racemosa, whereas in the high salinity zone it was Avicennia germinans. In the fall of leaf litter there were no significant differences between sites, although it was greater in internal area (4.7 Mg C ha-1 year-1 ± 0.77 Mg C ha-1 year-1) with respect to the area of the mouth (4 Mg C ha-1 year-1 ± 0.38 Mg C ha-1 year-1). It was observed that the concentration of interstitial salinity had a significant effect on the total carbon storage, being greater in the Internal zone (375 Mg C ha-1 ± 9.6 Mg C ha-1). In the Internal zone the litterfall decomposition rates are lower (t50 > 130 days), causing that, together with greater fall of leaf litter and lower export by the flow-ebb of the tide the accumulation of organic matter on the ground is favored.

Keywords : decomposition; structure; productivity; Rhizophora mangle; salinity; Yucatán.

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