Table 15-9. Comparison of the National Wetlands Inventory Classification 

 and Circular 39 Wetland Types Used in the Maine State Wetland 

 Inventory 



Circular 39 types 



NWI wetland and deepwater habitats 



Classes 



Water regimes 



Water 

 chemistrv 



Type 1 —Seasonally flooded basins or flats 

 Wet meadow (Dix and Smeins 1967; Stewart and 



Kantrud 1972) 

 Bottomland hardwoods (Braun 1950) 

 Shallow-freshwater swamps (Penfound 1952) 



Emergent Wetland 

 Forested Wetland 



Temporarily Flooded Fresh 

 Intermittently Mixosaline 



Flooded 



Type 2— Inland fresh meadows 

 Fen (Heinselman 1963) 

 Fen, northern sedge meadow (Curtis 1959) 



Type 3— Inland shallow fresh marshes 

 Shallow marsh (Stewart and Kantrud 1972; Golet and 

 Larson 1974) 



Type 4 — Inland deep fresh marshes 



Deep marsh (Stewart and Kantrud 1972; Golet and 

 Larson 1974) 



Type 5— Inland open fresh water 

 Open water (Golet and Larson 1974) 

 Submerged aquatic (Curtis 1959) 



Type 6— Shrub swamps 

 Shrub swamp (Golet and Larson 1974) 

 Shrub-carr, alder thicket (Curtis 1959) 



Type 7 — Wooded swamps 



Wooded swamp (Golet and Larson 1974) 

 Swamps (Penfound 1952; Heinselman 1963) 



Type 8— Bogs 



Bog (Uansereau and Segadas-vianna 1952; Heinselman 1963) 

 Pocosin (Penfound 1952; Kologiski 1977) 



Type 9— Inland saline flats 



Intermittent alkali zone (Stewart and Kantrud 1972) 



Emergent Wetland Saturated 



Fresh 

 Mixosaline 



Type 10— Inland saline marshes 

 Inland salt marshes (Ungar 1974) 



Type 1 1 — Inland open saline water 



Inland saline lake community (Ungar 1974) 



Type 12— Coastal shallow fresh marshes 

 Marsh (Anderson et al. 196H) 

 Estuarine bay marshes, estuarine river marshes 



(Stewart 1962) 

 Fresh and intermediate marshes (Chabreck 19721 



Emergent Wetland 



Emergent Wetland 

 Aquatic Bed 



Aquatic Bed 

 Unconsolidated 

 Bottom 



Scrub-Shrub 

 Wetland 



Forested Wetland 



Semipermanently Fresh 



Flooded Mixosaline 



Seasonally Flooded 



Permanently Flooded Fresh 

 Intermittently Mixosaline 



Exposed 

 Semipermanently 



Flooded 



Permanently Flooded Fresh 

 Intermittently Mixosaline 



Exposed 



All nonlidal regimes Fresh 

 except Permanently 

 Flooded 



All nontidal regimes Fresh 

 except Permanently 

 Flooded 



(Continued) 

 15-29 



10-80 



