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Titolo:
BIOGEOCHEMICAL EFFECTS OF SEAWATER RESTORATION TO DIKED SALT MARSHES
Autore:
PORTNOY JW; GIBLIN AE;
Indirizzi:
US GEOL SURVEY,BIOL RESOURCES DIV,CAPE COD NATL SEASHORE,99 MARCONI RD WELLFLEET MA 02667 MARINE BIOL LAB,CTR ECOSYST WOODS HOLE MA 02543
Titolo Testata:
Ecological applications
fascicolo: 3, volume: 7, anno: 1997,
pagine: 1054 - 1063
SICI:
1051-0761(1997)7:3<1054:BEOSRT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
VEGETATION CHANGE; ACCRETION RATES; COASTAL MARSH; CAPE-COD; MARINE; GROWTH; SEDIMENT; SALINITY; ENVIRONMENT; LIMITATION;
Keywords:
ACID SULFATE SOILS; CAPE COD; COASTAL WETLAND SUBSIDENCE; DIKING; EUTROPHICATION; SALT MARSH RESTORATION; SALT WATER INTRUSION; SPARTINA ALTERNIFLORA; SULFUR CYCLING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
J.W. Portnoy e A.E. Giblin, "BIOGEOCHEMICAL EFFECTS OF SEAWATER RESTORATION TO DIKED SALT MARSHES", Ecological applications, 7(3), 1997, pp. 1054-1063

Abstract

We conducted greenhouse microcosm experiments to examine the biogeochemical effects of restoring seawater to historically diked Cape Cod salt marshes. Feat cores from both seasonally flooded and drained diked marshes were waterlogged with seawater, and porewater chemistry was subsequently monitored for 21 mo. The addition of seawater to highly organic, seasonally flooded peat caused the death of freshwater wetland plants, 6-8 cm of sediment subsidence, and increased N and P mineralization. Also, sulfides and alkalinity increased 10-fold, suggesting accelerated decomposition by sulfate reduction. Addition of seawater to the low-organic-content acidic peat from the drained marsh increased porewater pH, alkalinity, PO4-P, and Fe(II), which we attribute to the reestablishment of SO4 and Fe(III) mineral reduction. Increased cation exchange contributed to 6-fold increases in dissolved Fe(II) and Al and60-fold increases in NH4-N within 6 mo of salination. Seawater reintroductions to seasonally flooded diked marshes will cause porewater sulfides to increase, likely reducing the success of revegetation efforts. Sulfide toxicity is of less concern in resalinated drained peats because of the abundance of Fe(II) to precipitate sulfides, and of NH4-N to offset sulfide inhibition of N uptake. Restoration of either seasonally flooded or drained diked marshes could stimulate potentially large nutrient and Fe(II) releases, which could in turn increase primary production and lower oxygen in receiving waters. These findings suggestthat tidal restoration be gradual and carefully monitored.

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Documento generato il 08/08/20 alle ore 08:58:19