Organic geochemistry of Ribetehilo peat bog (Doñana N.P., SW-Spain)

Póster presentado en el 1st Iberian Meeting in Separation Sciences & Mass Spectrometry, XIX Conference of the Spanish Society of Chromatography and Related Techniques (SECyTA), IX Conference of the Spanish Society of Mass Spectrometry (SEEM), VI Conference of the Mass Spectrometry Group of the Portuguese Society of Chemistry (SPQ). Santiago de Compostela, October 8th-11th (2019).
In less than 50 years the area occupied by peat bogs in the Gulf of Cádiz (SW‐Spain) has been reduced by more than 90%. The peat bog studied here may well be considered as relict and one of the last and more Meridional still in existence in the Northern hemisphere. The vertical molecular composition of a 85 cm peat bog from Ribetehilo lagoon (Doñana National Park; SW‐Spain 37° 7'30.81"N; 6°37'50.19"O) is studied using analytical pyrolysis (Py‐GC/MS) and ultra‐high resolution mass spectrometry (ESI‐FT‐ICR/MS). The results obtained by the two techniques were similar, showing as shallow OC composition was dominated by fresh material from upper vegetation cover, while more transformed and humified material was accumulated in the bottom layers. This may be due to i) intense microbial activity combined with large fluctuations of the water table occurring during the year; and/or ii) anaerobic rocesses. In general, the lack of peat preservation in depth is probably a sign of bog degradation processes, probably linked with climate changes to which Mediterranean wetlands are particularly responsive.
MICIU INTERCARBON Project (CGL2016‐78937‐R UE/FEDER). N.T. Jiménez‐Morillo and L. San Emeterio thanks the MICIU for funding FPI research grants (BES‐2013‐062573 and Ref. BES‐2017‐07968 UE/FEDER). Prof. P. Hatcher (Old Dominion Univ., USA) for advice and access to the COSMIC ESI‐FT‐ICR/MS instrument. Desiré Monis for technical assistance.