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Titolo:
Vertical movement and substrate characteristics of oligohaline marshes near a high-sediment, riverine system
Autore:
Holm, GO; Sasser, CE; Peterson, GW; Swenson, EM;
Indirizzi:
Louisiana State Univ, Ctr Coastal Energy & Environm Resources, Inst Coastal Ecol, Baton Rouge, LA 70803 USA Louisiana State Univ Baton Rouge LA USA 70803 , Baton Rouge, LA 70803 USA
Titolo Testata:
JOURNAL OF COASTAL RESEARCH
fascicolo: 1, volume: 16, anno: 2000,
pagine: 164 - 171
SICI:
0749-0208(200024)16:1<164:VMASCO>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBMERGING COASTAL MARSH; WETLAND LOSS; NORTHERN GULF; SALT MARSHES; WATER LEVEL; DELTA PLAIN; LOUISIANA; MEXICO; ACCUMULATION; VEGETATION;
Keywords:
Coastal Louisiana; oligohaline marshes; hydrology; substrate properties; floating marshes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Holm, GO Louisiana State Univ, Ctr Coastal Energy & Environm Resources, Inst Coastal Ecol, Baton Rouge, LA 70803 USA Louisiana State Univ Baton Rouge LA USA 70803 ouge, LA 70803 USA
Citazione:
G.O. Holm et al., "Vertical movement and substrate characteristics of oligohaline marshes near a high-sediment, riverine system", J COAST RES, 16(1), 2000, pp. 164-171

Abstract

In coastal Louisiana, large sediment diversions from the Mississippi and Alchafalaya Rivers have been planned to enhance marsh accretion and productivity and reverse an overall deterioration of coastal marshes. Located between these rivers, there are extensive buoyant marshes in the freshwater and oligohaline zones (about 70% of the vegetated area), and little informationexists on how buoyant substrates respond to mineral sediment introduction. The purpose of this study was to understand the vertical movement (buoyancy) and substrate properties of oligohaline marshes with increasing distancefrom the Atchafalaya River-Fourleague Bay system, a significant mineral sediment source. To do this thirty-seven stations were established (within a study area of 125 km(2)) where vertical marsh movement and marsh hydrology were monitored for a year, and soil cores were collected and analyzed for bulk properties. With increasing distance inland from the sediment source, there were significant increases in vertical movement of the marsh mat and decreasing mineral sediment content in the soil profile. In the interior marshes farthest from the sediment source, the average mat movement was greater than 15 cm, and some sites exceeded 25 cm. Non-buoyant marshes with high substrate bulk density were located closest to the sediment source. Mineralsediment deposition appeared to be a discontinuous process controlled by large events such as hurricanes and tropical storms, rather than average yearly flood events. A comparison of our data (from oligohaline marshes) with other studies (from freshwater marshes) suggests that increases of mineral matter within the upper peat matrix may decrease the vertical movement of marsh substrates.

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Documento generato il 10/07/20 alle ore 02:23:44