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Titolo:
ECOLOGY AND ENERGETICS OF SLACKS IN THE ALEXANDRIA COASTAL DUNEFIELD
Autore:
MCLACHLAN A; KERLEY G; RICKARD C;
Indirizzi:
UNIV PORT ELIZABETH,INST COASTAL RES,DEPT ZOOL,POB 1600 PORT ELIZABETH 6000 SOUTH AFRICA UNIV PORT ELIZABETH,INST COASTAL RES,DEPT ZOOL PORT ELIZABETH 6000 SOUTH AFRICA
Titolo Testata:
Landscape and urban planning
fascicolo: 3-4, volume: 34, anno: 1996,
pagine: 267 - 276
SICI:
0169-2046(1996)34:3-4<267:EAEOSI>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
TALORCHESTIA-CAPENSIS CRUSTACEA; GERBILLURUS-PAEBA-EXILIS; HAIRY-FOOTED GERBIL; SOUTH-AFRICA; DUNE SLACK; SURF-ZONE; GROWTH; TALITRIDAE; AMPHIPOD;
Keywords:
ECOSYSTEM; SLACKS; DUNES; VEGETATION; SOUTH AFRICA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
A. Mclachlan et al., "ECOLOGY AND ENERGETICS OF SLACKS IN THE ALEXANDRIA COASTAL DUNEFIELD", Landscape and urban planning, 34(3-4), 1996, pp. 267-276

Abstract

This paper summarises information on the structure and function of dune slacks as discrete ecosystems within the Alexandria coastal dunefield. A typical slack, with a total area of 1900 m(2) and floor area of 8833 m(2), harbours four dominant species of pioneer plants in a succession spanning 5 years, corresponding to the interval between a section of slack floor being uncovered by a retreating dune and smothered byan advancing dune. Vegetation biomass totals 221.1 g m(-2) and detritus mass 40.1 g m(-2), with 31% and 3% above ground, respectively. Annual plant production is estimated at 190 g m(-2) using a combination oftheoretical calculations and vegetative growth estimates. Animal biomass has been quantified for interstitial meiofauna at 1.0 g m(-2) and all arthropod and vertebrate macrofauna at 0.2 g m(-2). Based on estimated decomposition coefficients of 0.5 year(-1) and theoretical consumption estimates for the fauna, 14% of plant production is grazed directly (93% by plant parasitic nematodes, 7% by macrofauna) and 86% enters the detritus pool. Of the latter, 2% is consumed by macrofauna detritivores, 63% is decomposed by the interstitial fauna and 35% accumulates to add to the detritus pool. Vegetation succession and production in the slack thus results in a net build-up of organic matter in the sand, This is finally decomposed when the slack is smothered by an advancing dune ridge, thus maintaining a long term equilibrium level of soil organics. These slacks require minimal management as long as free dune movement and limited human access are maintained.

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Documento generato il 22/09/20 alle ore 20:47:15