The Physical and Chemical Environment
Wetlands, whether forest or heath, grassland or rush, are structurally similar to terrestrial systems. The tidal salt marshes of the Duplin River are no exception. However, here the land has been shaped by a changing sea level since the Pleistocene. Locally tidal erosion and deposition determine the pattern of marsh and creeks, but the functional unit is still the watershed. Tidal currents generated in the sea are the primary driving force in the physical environment. Fresh water input from rain may cause erosion and influence flushing of the watershed, but fresh water from the Altamaha River, which enters the mouth of the Duplin River, influences only the water chemistry.
KeywordsSalt Marsh Particulate Organic Carbon Tidal Cycle Interstitial Water Tidal Creek
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