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Annual Review of Marine Science

Volume 17, 2025

Feedbacks Regulating the Salinization of Coastal Landscapes

Abstract

The impact of saltwater intrusion on coastal forests and farmland is typically understood as sea-level-driven inundation of a static terrestrial landscape, where ecosystems neither adapt to nor influence saltwater intrusion. Yet recent observations of tree mortality and reduced crop yields have inspired new process-based research into the hydrologic, geomorphic, biotic, and anthropogenic mechanisms involved. We review several negative feedbacks that help stabilize ecosystems in the early stages of salinity stress (e.g., reduced water use and resource competition in surviving trees, soil accretion, and farmland management). However, processes that reduce salinity are often accompanied by increases in hypoxia and other changes that may amplify saltwater intrusion and vegetation shifts after a threshold is exceeded (e.g., subsidence following tree root mortality). This conceptual framework helps explain observed rates of vegetation change that are less than predicted for a static landscape while recognizing the inevitability of large-scale change.

Keyword(s): agriculture, climate, marsh, sea-level rise, soil, wetland
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/content/journals/10.1146/annurev-marine-070924-031447
2025-01-16
2025-04-18
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/content/journals/10.1146/annurev-marine-070924-031447
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Feedbacks Regulating the Salinization of Coastal Landscapes
Annual Review of Marine Science 17, 461 (2025); https://doi.org/10.1146/annurev-marine-070924-031447
/content/journals/10.1146/annurev-marine-070924-031447
/content/journals/10.1146/annurev-marine-070924-031447
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