Spatial pattern formation of coastal vegetation in response to external gradients and positive feedbacks affecting soil porewater salinity: A model study

Jiang Jiang, Donald L. DeAngelis, Thomas J. Smith, Su Yean Teh, Hock Lye Koh

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Coastal vegetation of South Florida typically comprises salinity-tolerant mangroves bordering salinity-intolerant hardwood hammocks and fresh water marshes. Two primary ecological factors appear to influence the maintenance of mangrove/hammock ecotones against changes that might occur due to disturbances. One of these is a gradient in one or more environmental factors. The other is the action of positive feedback mechanisms, in which each vegetation community influences its local environment to favor itself, reinforcing the boundary between communities. The relative contributions of these two factors, however, can be hard to discern. A spatially explicit individual-based model of vegetation, coupled with a model of soil hydrology and salinity dynamics is presented here to simulate mangrove/hammock ecotones in the coastal margin habitats of South Florida. The model simulation results indicate that an environmental gradient of salinity, caused by tidal flux, is the key factor separating vegetation communities, while positive feedback involving the different interaction of each vegetation type with the vadose zone salinity increases the sharpness of boundaries, and maintains the ecological resilience of mangrove/hammock ecotones against small disturbances. Investigation of effects of precipitation on positive feedback indicates that the dry season, with its low precipitation, is the period of strongest positive feedback.

Original languageEnglish
Pages (from-to)109-119
Number of pages11
JournalLandscape Ecology
Volume27
Issue number1
DOIs
StatePublished - Jan 1 2012

Fingerprint

porewater
mangrove
ecotone
salinity
vegetation
environmental factors
soil
community
disturbance
individual-based model
simulation model
resilience
feedback mechanism
habitat
environmental gradient
vadose zone
vegetation type
dry season
marsh
hydrology

Keywords

  • Ecotone
  • Environmental gradient
  • Individual-based model
  • Mangrove vegetation
  • Positive feedback
  • Vegetation aggregation

ASJC Scopus subject areas

  • Nature and Landscape Conservation
  • Ecology
  • Geography, Planning and Development

Cite this

Spatial pattern formation of coastal vegetation in response to external gradients and positive feedbacks affecting soil porewater salinity : A model study. / Jiang, Jiang; DeAngelis, Donald L.; Smith, Thomas J.; Teh, Su Yean; Koh, Hock Lye.

In: Landscape Ecology, Vol. 27, No. 1, 01.01.2012, p. 109-119.

Research output: Contribution to journalArticle

Jiang, Jiang ; DeAngelis, Donald L. ; Smith, Thomas J. ; Teh, Su Yean ; Koh, Hock Lye. / Spatial pattern formation of coastal vegetation in response to external gradients and positive feedbacks affecting soil porewater salinity : A model study. In: Landscape Ecology. 2012 ; Vol. 27, No. 1. pp. 109-119.
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