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Beach-cast as biofertiliser in the Baltic Sea region-potential limitations due to cadmium-content
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-1933-4193
Univ Gothenburg, Dept Marine Sci, Kristineberg Stn, Kristineberg 566, SE-45178 Fiskebackskil, Sweden..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-3745-4092
2019 (English)In: Ocean and Coastal Management, ISSN 0964-5691, E-ISSN 1873-524X, Vol. 169, p. 20-26Article in journal (Refereed) Published
Abstract [en]

Macroalgal mass blooms and accumulating beach-cast are increasing problems in many coastal areas. However, beach-cast is also a potentially valuable marine bioresource, e.g. as a biofertiliser in coastal agriculture. One limiting factor in use of beach-cast as a fertiliser is uncertainty regarding the cadmium (Cd) concentration depending on beach-cast composition and location. In this study, chemical analyses were performed on beach cast from Burgsviken Bay off Gotland, in the Baltic Sea. The results revealed large variations in cadmium concentration depending on sampling location and beach-cast composition, with levels ranging between 0.13 and 2.2 mg Cd/kg dry matter (DM). Of 15 beach-cast samples analysed, one had a cadmium content above the Swedish statutory limit for sewage sludge biofertiliser (2 mg Cd/kg DM) and four had values above the limit suggested by the Swedish Environmental Protection Agency for 2030 (0.8 mg/kg DM). Species-specific analysis revealed that eelgrass (Zostera marina) contained significantly higher cadmium concentrations than filamentous red algae species (Ceramium and Polysiphonia spp.). Avoiding eelgrass-rich beach-cast by seasonal timing of harvesting and monitoring differences in cadmium concentrations between harvesting sites could thus facilitate use of beach-cast as biofertiliser.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 169, p. 20-26
Keywords [en]
Beach-cast management, Macro algae, Seagrass, Zostera marina, Marine bioresources, Cadmium-levels, Biofertiliser, Species composition
National Category
Environmental Management
Identifiers
URN: urn:nbn:se:kth:diva-246247DOI: 10.1016/j.ocecoaman.2018.11.015ISI: 000459518700003Scopus ID: 2-s2.0-85058051876OAI: oai:DiVA.org:kth-246247DiVA, id: diva2:1302014
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved

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Franzen, Johan.Gröndahl, Fredrik

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