Processes driving seagrass soils composition along the western Mediterranean: The case of the southeast Iberian Peninsula

Nerea Piñeiro-Juncal*, Elena Díaz-Almela, Carmen Leiva-Dueñas, Ona Deulofeu, Jaime Frigola, Montserrat Soler, Antonio Martinez-Cortizas, Santiago Giralt, Jordi Garcia-Orellana, Miguel Ángel Mateo

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Seagrasses are distributed all along the coast of the Mediterranean Sea being Posidonia oceanica and Cymodocea nodosa the most common species. They promote sedimentation, leading to the formation of well-structured soils. Over the last decade, a growing attention has been paid to their role as CO2 sinks in the form of organic carbon (Corg) and to their use as environmental archives. However, most of the knowledge about pedogenetic processes in these soils refer to the rhizosphere. This study aims to understand seagrass soils biogeochemistry in the rhizosphere and below, which in turn can help to understand their long term formation processes. Fifteen cores were strategically sampled along a 350 km stretch of the Southeast Iberian coast, and analyzed for elemental composition (XRF core-scanning), magnetic susceptibility, Corg content and gran size distribution. The cores were dated by 210Pb and 14C-AMS techniques to estimate soil accretion. Principal component analysis was used to explore the main geochemical processes linked to soil formation. The results showed that terrestrial runoff plays a key role in meadow soil composition. Furthermore, Corg accumulation did not follow any general depth trend in our soil records, suggesting that temporal variation in Corg inputs is an important factor in determining carbon depth distribution within the soil. We obtained evidence that the establishment of well-developed, stable C. nodosa meadows in the Mediterranean Sea may be promoted by adverse environmental conditions to P. oceanica settlement. Metal's behavior within the meadow deposit and their interaction with organic matter and carbonates is unclear. The results presented in this paper highlight the importance of the influence of land-based inputs in the characteristics of seagrass meadow deposits, highly determining their Corg content, as well as the need for further studies on metal behavior, to understand their full potential as environmental records.

Original languageAmerican English
Article number144352
Pages (from-to)144352
Number of pages13
JournalScience of the Total Environment
Volume768
DOIs
Publication statusPublished - 1 May 2021

Keywords

  • Blue carbon
  • Coastal zone
  • Pedogenetical processes
  • Seagrass sediments
  • Subaquatic soils
  • Geologic Sediments
  • Alismatales
  • Soil
  • Carbon
  • Mediterranean Sea
  • Pedogenencal processes

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