Labile organic carbon regulates phosphorus release from eroded soil transported into anaerobic coastal systems

Jouni Lehtoranta*, Petri Ekholm, Stella Wahlström, Petra Tallberg, Risto Uusitalo

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

11 Sitaatiot (Scopus)

Abstrakti

Coastal eutrophication is expected to increase due to expanding and intensifying agriculture which causes a large amount of soil-associated P to be transported into aquatic systems. We performed anaerobic long-term incubations on field soil to mimic the conditions that eroded soil encounters in brackish sediments. The release of P from soil increased with the amount of labile organic C (acetate) addition and decreased with the soil/solution ratio. We deduce that in less-productive brackish systems, microbial Fe reduction allows for the maintenance of the coupled cycling of Fe and P and restricts the amount of P entering the oxic water. In more eutrophic systems, the formation of Fe sulfides as a result of SO4 reduction inactivates Fe, and leads to a higher release of P, thus generating an adverse feedback effect. The dependence of the fate of soil-bound Fe and P on the trophic status of the receiving water should be recognized in eutrophication management.

AlkuperäiskieliEnglanti
SivutS263-S273
Sivumäärä11
JulkaisuAmbio
Vuosikerta44
NumeroSupplement 2
DOI - pysyväislinkit
TilaJulkaistu - maaliskuuta 2015
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu
TapahtumaInternational Phosphorus Workshop - Uppsala, Ruotsi
Kesto: 9 syyskuuta 201313 syyskuuta 2013
Konferenssinumero: 7

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