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Titolo:
Salinity as a constraint on growth of oligohaline marsh macrophytes. II. Salt pulses and recovery potential
Autore:
Howard, RJ; Mendelssohn, IA;
Indirizzi:
US Geol Survey, Natl Wetlands Res Ctr, Lafayette, LA 70506 USA US Geol Survey Lafayette LA USA 70506 ds Res Ctr, Lafayette, LA 70506 USA Louisiana State Univ, Wetlands Biogeochem Inst, Baton Rouge, LA 70803 USA Louisiana State Univ Baton Rouge LA USA 70803 , Baton Rouge, LA 70803 USA
Titolo Testata:
AMERICAN JOURNAL OF BOTANY
fascicolo: 6, volume: 86, anno: 1999,
pagine: 795 - 806
SICI:
0002-9122(199906)86:6<795:SAACOG>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
VIRGINICUS L KUNTH; FRESH-WATER; SAGITTARIA-LANCIFOLIA; SALTWATER INTRUSION; COASTAL MARSHES; VEGETATION; RESPONSES; TOLERANCE; PLANTS;
Keywords:
coastal marsh; Louisiana; plant growth recovery; resiliency; salinity stress; wetlands;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Howard, RJ US506ol Survey, Natl Wetlands Res Ctr, 700 Cajundome Blvd, Lafayette, LA 70 US Geol Survey 700 Cajundome Blvd Lafayette LA USA 70506 LA 70
Citazione:
R.J. Howard e I.A. Mendelssohn, "Salinity as a constraint on growth of oligohaline marsh macrophytes. II. Salt pulses and recovery potential", AM J BOTANY, 86(6), 1999, pp. 795-806

Abstract

The ability of common oligohaline marsh macrophytes of the northern Gulf of Mexico coast to recover from pulses of increased salinity was investigated in a greenhouse: experiment with Eleocharis palustris, Panicum hemitomon,Sagittaria lancifolia, and Scirpus americanus monocultures. Components of salinity pulses applied were final salinity reached (6 or 12 g/L), salinityinflux rate (3 d or 3 wk), and duration of exposure (1, 3, or 3 mo). Aftereach exposure period, we placed plants into freshwater until the end of the 120-d experiment to determine recovery potential. The four species variedin their ability to recover from the salinity pulses. Within a species, recovery varied with final salinity level and duration of exposure, and to a lesser extent with salinity influx rate. Scirpus americanus, growth of which was stimulated by <3 mo of exposure to 6 g/L, was able to recover even under the most extreme conditions of exposure to 12 g/L salinity for 3 mo. Ability to recover decreased with increased salinity and increased duration of exposure for the remaining three species. Recovery of specific aspects ofgrowth was also suppressed in these species by a rapid salinity influx rate compared to a slow influx rate. The complex variations in recovery patterns displayed by the different species may lead to changes in species dominance following the short-term salinity pulses that can occur during storm events, which in turn may affect marsh plant community composition and structure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/08/20 alle ore 09:04:37