The Natural Communities of Virginia
Classification of Ecological Community Groups
SECOND APPROXIMATION (Version 2.2)
Pond Pine Woodlands and Pocosins
This ecological group is characterized by coniferous, pyrophytic woodlands of saturated, oligotrophic, Coastal Plain peatlands. These communities are restricted to southeastern Virginia, eastern North Carolina, and northeastern South Carolina. Although no doubt more widespread in the pre-settlement Virginia landscape, only a few remnants of these communities are currently found in the extreme southeastern part of the state. The largest extant occurrences are in the Great Dismal Swamp National Wildlife Refuge (Cities of Suffolk and Chesapeake) and on remote peat flats beyond the range of wind-tidal flooding along the North Landing River (City of Virginia Beach) and Northwest River (City of Chesapeake). Pond Pine Woodlands and Pocosins have high biomass and consist largely of inflammable woody plants that are specially adapted to frequent, intense burning. All present-day examples in Virginia suffer to some extent from a reduction in fire frequencies or complete suppression of fires. Stand physiognomy and composition reflect responses to gradients of fire frequency and peat depth. Stands known as “high pocosins” are associated with deeper organic soils and more frequent fires; these have only scattered, stunted pond pines (
Pinus serotina) emergent from nearly impenetrable evergreen shrub thickets dominated by shining fetterbush (
Lyonia lucida), inkberry (
Ilex glabra), Carolina sheep-laurel (
Kalmia carolina), and laurel-leaf greenbrier (
Smilax laurifolia). Stands associated with superficial peat and/or longer periods without fire often develop nearly closed canopies of larger pond pines, understories of red maple (
Acer rubrum), sweetbay (
Magnolia virginiana), and red bay (
Persea palustris), and less dense shrub layers that contain more deciduous species. Few herbaceous species except Virginia chain fern (
Woodwardia virginica) thrive in pond pine woodlands.
Pond Pine Woodlands and Pocosins are floristically similar to both Peatland Atlantic White-Cedar Forests and Streamhead Pocosins. They differ from the former in overstory dominance, greater shrub density, and association with peatlands that formerly were subject to much shorter fire return intervals. Unlike Streamhead Pocosins, they occupy deep organic soils saturated by perched groundwater (vs. superficial organic soils with seepage inputs). Communities in this group are globally rare, rapidly declining, and scarcely viable due to fragmentation and the absence of sustaining fire frequencies.
References: Dean (1969), Focazio
et al . (1998), Fleming and Moorhead (1998), Frost (1995),
Stevens and Patterson (1998).
Click on the images below to open a larger image in a separate window.
|
A recently burned Pond Pine Woodland (“High Pocosin”) on a large peatland west of the North Landing River near
Blackwater, City of Virginia Beach. A dense shrub complex of shining fetterbush (Lyonia lucida), inkberry (Ilex glabra),
Carolina sheep-laurel (Kalmia carolina), and laurel-leaf greenbrier (Smilax laurifolia) covers the site.
Photo: Tom Rawinski.
|
REPRESENTATIVE COMMUNITY TYPES:
A single community type has been defined on the basis of 11 plots from peatlands of the North Landing River, Northwest River, and Great Dismal Swamp. Two fully intergrading subtypes representing more open, shrubby stands and more closed, forested stands were recognized by Fleming and Moorhead (1998). Additional data are not likely to change the circumscription of this type nor add additional types
to this group. Click on any highlighted CEGL code below to view the global USNVC description provided by NatureServe Explorer.
- Pinus serotina / Smilax laurifolia – Ilex glabra / Woodwardia virginica Woodland
Pond Pine Woodland / Pocosin
USNVC:CEGL004652
Global/State Ranks: G2?/S1S2
