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Titolo:
Primary production and macro-detritus dynamics in a European salt marsh: carbon and nitrogen budgets
Autore:
Bouchard, V; Lefeuvre, JC;
Indirizzi:
Univ Rennes 1, Lab Evolut Syst Nat & Modifies, CNRS, UMR Ecobio 6553, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 Ecobio 6553, F-35042 Rennes, France Museum Natl Hist Nat, F-35042 Rennes, France Museum Natl Hist Nat RennesFrance F-35042 t Nat, F-35042 Rennes, France
Titolo Testata:
AQUATIC BOTANY
fascicolo: 1, volume: 67, anno: 2000,
pagine: 23 - 42
SICI:
0304-3770(200005)67:1<23:PPAMDI>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICULATE ORGANIC-MATTER; SPARTINA-ALTERNIFLORA; SW NETHERLANDS; INUNDATION; ESTUARY; BIOMASS; DECOMPOSITION; COMMUNITIES; FLUXES; LITTER;
Keywords:
coastal marsh; aboveground biomass; litter; export; fluxes; decomposition; marsh level;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Bouchard, V Ohio State Univ, Sch Nat Resources, 2021 Coffey Rd, Columbus, OH 43210 USA Ohio State Univ 2021 Coffey Rd Columbus OH USA 43210 43210 USA
Citazione:
V. Bouchard e J.C. Lefeuvre, "Primary production and macro-detritus dynamics in a European salt marsh: carbon and nitrogen budgets", AQUATIC BOT, 67(1), 2000, pp. 23-42

Abstract

Primary production and the detritus pathway (i.e., detritus production, litter fall, export to coastal waters, and decomposition) were studied over aI-year period in three salt marsh levels (low, middle and high marshes). Carbon and nitrogen content in biomass and macro-detritus were estimated at each step of the detrital pathway. Several lines of evidence suggested thatlow, middle and high marshes had different properties which affected theirinteraction with adjoining waters. More than species diversity, the salt marsh zonation across a 1.8 km transect resulted in a spatial and temporal heterogeneity in the distribution of organic matter and nutrients within thesalt marsh. The low marsh was the less productive level (1080 g dry weightm-(2) per year) and was a source of organic matter for the two other marshlevels. Almost 89% of the organic matter produced in the low marsh was flushed away by the tide and redistributed inside the marsh, whereas the remainder decomposed quickly (0.023 per day) at the production site. The export of macro-detritus to coastal waters was probably insignificant to the carbon and nitrogen balance of the salt marsh. In the middle and high marshes, most of the production fell as litter directly at the production site. In the high marsh, vegetation stands were very productive (1990 g dry weight m(-2) per year) and litter decomposed slowly (0.0047 per day), The middle marsh was as productive as the high marsh (1910 g dry weight m(-2) per day), but the decay rate (0.028 per day) was similar to that estimated for the low marsh. This study demonstrates that the mineralization of halophyte-derivedorganic matter takes place almost completely within the marsh itself. Dataon carbon and nitrogen decay indicated that only a small part of the high marsh production was rapidly available to fuel food webs of the ecosystem or to be exported to coastal waters. In contrast, the high amount of biomassproduced in the middle marsh was rapidly available for food webs, Export of organic matter may be controlled by macro-detritus production (amount andtiming), intensity and time distribution of tide events, and, mostly, decay rates. Because for most of the year the marsh is exposed to the atmosphere, we suggest that exchanges of gaseous carbon and nitrogen with the atmosphere should be investigated. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 00:13:12