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Titolo:
SULFATE-INDUCED ENTROPHICATION AND PHYTOTOXICITY IN FRESH-WATER WETLANDS
Autore:
LAMERS LPM; TOMASSEN HBM; ROELOFS JGM;
Indirizzi:
UNIV NIJMEGEN,DEPT ECOL,RES GRP ENVIRONM BIOL,TOERNOOIVELD 1 NL-6525 ED NIJMEGEN NETHERLANDS
Titolo Testata:
Environmental science & technology
fascicolo: 2, volume: 32, anno: 1998,
pagine: 199 - 205
SICI:
0013-936X(1998)32:2<199:SEAPIF>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRATIOTES-ALOIDES L; NYMPHAEA-ALBA L; SULFIDE ACCUMULATION; PRECAMBRIAN SHIELD; IRON LIMITATION; WATER CHEMISTRY; FLOODED SOILS; PHOSPHORUS; RELEASE; SEDIMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
L.P.M. Lamers et al., "SULFATE-INDUCED ENTROPHICATION AND PHYTOTOXICITY IN FRESH-WATER WETLANDS", Environmental science & technology, 32(2), 1998, pp. 199-205

Abstract

In recent decades, sulfate concentrations in many European freshwaterwetlands have increased by 10-fold or more, due mainly to the use of sulfate-polluted river water to compensate for water shortage in theseareas. To test the effect of surf ate enrichment a mesocosm experiment was set up, using waterlogged soil cores, intact with vegetation, from a mesotrophic fen meadow. During sulfate addition at environmentally relevant levels (0, 2, and 4 mmol L-1), phosphate concentration and alkalinity of the pore water rapidly rose due to increased sulfate reduction rates. Free sulfide accumulated to levels toxic to several wetland plant species and biomass regrowth after harvesting was significantly lower on treated soils, especially for Carer species. Eventually, the concentrations of ammonium, phosphate, and potassium increased strongly in the treated soils due to reduced uptake by plants and extra mineralization. Sulfate availability was rate limiting, until the supply of readily decomposable organic matter became limited. It is argued that the Significance of the observed changes in free sulfide concentrations and in the rate of nutrient mobilization should be recognized, and that these effects can be as important as direct eutrophication caused by the import of nutrients. The reported changes may severely influence the plant species composition of freshwater wetlands.

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Documento generato il 24/11/20 alle ore 14:03:52