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保育與休閒部 
目錄濱海平原/皮埃蒙特滲漏沼澤
這個群集成的林地植物，包括由豐富的地下水排放飽和而飽和的表面斜坡。該組中的分類單位沿著土壤肥力和地下水化學的漸層分開，從極度酸性和營養貧窮到高鈣質的範圍。儘管基質狀況有很大的差異，但該群組中的社區共有水文和地形上相似的棲息地，以及許多濕地物種可承受各種土壤條件。
The more acidic and nutrient-poor seepage swamps, occurring primarily in the Coastal Plain, are characterized by Sphagnum-covered hummocks in a sandy or peaty substrate. The habitats are generally wet and somewhat protected from fire, although adjacent upland forests are generally pyrophytic; there is little doubt that prior to widespread exclusion of wildfires, fire occasionally burned into these habitats during dry periods. Dominant overstory species are red maple (Acer rubrum) and blackgum (Nyssa sylvatica), with tulip-tree (Liriodendron tulipifera) and loblolly pine (Pinus taeda) also locally important. Common small trees and shrubs are sweetbay magnolia (Magnolia virginiana var. virginiana), sweet pepperbush (Clethra alnifolia), highbush blueberries (Vaccinium spp.), swamp azalea (Rhododendron viscosum var. viscosum), smooth winterberry (Ilex laevigata), and southern wild raisin (Viburnum nudum). Compact dodder (Cuscuta compacta) is often abundantly attached to the stems of shrubs in these swamps. Common herbaceous species include cinnamon fern (Osmundastrum cinnamomeum), netted chain fern (Lorinseria areolata), and the sedges Carex lonchocarpa and Carex seorsa. Less widespread herbaceous species that could be considered more or less diagnostic (especially on the Coastal Plain) include skunk cabbage (Symplocarpus foetidus), kidney-leaved grass-of-parnassus (Parnassia asarifolia), Collins's sedge (Carex collinsii), twining bartonia (Bartonia paniculata ssp. paniculata), and the federally listed swamp-pink (Helonias bullata).
Seepage swamps occupying the bottoms of Coastal Plain ravines that have downcut into Tertiary shell deposits or limesands have strongly calcareous soils and groundwater. These very rare, small-patch communities are known from the dissected inner Coastal Plain of Surry, Isle of Wight, York, James City, Gloucester, and Lancaster Counties. Hummock-and-hollow microtopography is prevalent, and exposed shells are common in springs and rills. Green ash (Fraxinus pennsylvanica), red maple (Acer rubrum), and tulip-tree (Liriodendron tulipifera) are common overstory trees in most occurrences, but a subset of ravines on the south side of the James River features the unusual co-dominance of bald cypress (Taxodium distichum) or swamp tupelo (Nyssa biflora). Small trees and shrubs include stiff dogwood (Cornus foemina ), spicebush (Lindera benzoin var. benzoin and var. pubescens), and wax myrtle (Morella cerifera). A number of noteworthy mountain disjuncts have been documented in the herbaceous flora of these communities, including marsh marigold (Caltha palustris var. palustris), rigid sedge (Carex tetanica), bog twayblade (Liparis loeselii; state-rare), swamp lousewort (Pedicularis lanceolata), and American false-hellebore (Veratrum viride). Reaching their northern limits are the southern species Florida adder's-mouth (Malaxis spicata), shadow witch orchid (Ponthieva racemosa), and drooping bulrush (Scirpus lineatus). Other characteristic herbs include lizard's-tail (Saururus cernuus), golden ragwort (Packera aurea), blackfruit clearweed (Pilea fontana), smooth bur-marigold (Bidens laevis), Carolina buttercup (Ranunculus carolinianus), common brome sedge (Carex bromoides spp. bromoides), and common wood reedgrass (Cinna arundinacea). The damp, fertile habitats are particularly susceptible to invasion by the introduced Japanese stiltgrass (Microstegium vimineum). The globally rare Tidewater interstitial amphipod (Stygobromus araeus) appears to be closely associated with groundwater in shell marl deposits.
馬里蘭州和弗吉尼亞州的皮埃蒙特和北部沿岸平原內部已記錄了相關滲漏沼澤，似乎代表出現的一種出現在新英格蘭北至南部的類型。這種類型通常發生在洪水平原的邊緣區域或廢棄的牛弓，地下水從鄰近斜坡的底部排出。土壤樣本的實驗室分析證實，這些皮埃蒙特/北部海岸平原的棲息地是在極酸性和高鈣化的沿岸平原沼澤之間的土壤化學中間中間體，即是酸性強，但鈣、鎂和總鹼飽和度等級中等。在弗吉尼亞州，這種類最具特色的物種似乎是紅楓、綠灰、白灰（ Fraxinus americana ）、鬱金香樹、香草樹、海豚白菜（ Symplocarpus foetidus ）、肉桂樹（ Osmundastrum cinnam omeum）、橙色珠寶草（Impatiens capensis）和清草（Pilea pumila）。
幾種不常見的牙齒動物（蝴蝶和蝴蝶）依賴森林滲漏以進行繁殖的棲息地。沿岸平原/皮埃蒙特滲漏沼澤的規模相對較小，受到海象活動、農業污染物、水文干擾和伐木的威脅。這些沼澤的灰分目前因昆蟲病原爆發而受到嚴重壓力。與這種害蟲相關的大量樹木死亡率和間隙干擾，幾乎肯定會導致長期成分變化，並增加對入侵雜草的敏感性。參考文獻：弗萊明（2002 a），弗萊明（2007），麥科伊和弗萊明（2000），拉溫斯基（1995）。
© DCR-DNH，加里 ·P· 弗萊明。
下載下面列出的每種社群類型的組成摘要統計資料表。
