|Pitch Pine barren near Waterboro, Maine|
understory of lowbush blueberry, sweetfern, and bear oak
Some examples were enchanting forests; gnarly & twisted pines with charred boles, multiple age classes, and patchy ground cover openings. All sites occurred on "sandplains" or glacial outwash plains. These deep sandy soils supported two consistent species across all sites visited; Pitch pine (Pinus rigida) & Bear Oak (Quercus ilicifolia). Bear Oak was often heavily dominant as a tall shrub or dense midstory layer.
|Pinus rigida bole displaying epicormic shoots|
|Bear Oak (Quercus ilicifolia)|
Many areas I visited were thickly stocked with dense Pitch Pine, while others were open woodlands. Fire history could partially explain those density differences, with more frequently burned sites supporting the woodlands.
Much of the region around the Waterboro Barrens, was burned over in Maine's largest series of forest fires in 1947. Since that time (and prior to restoration work), a 93% decline in open canopy pitch pine has been documented (2).
In addition to the loss of open woodlands, Patterson (1) found that stands unburned since 1947 had developed highly volatile, well aerated fuels conducive to high intensity, fast moving fires.
|Waterboro Barrens thinning; |
dense forest (left) unthinned, open woodland (right) mechanically thinned.
|Concord, New Hampshire|
Pitch Pine Woodlands:
(contrast both to image at top of page)
While appearing structurally similar, understory composition varied considerably; Concord (right) was much richer floristically and perhaps has a longer and/or more recent history of prescribed fire; prescribed burns began there in 2003 and ~ 20 acres or so have been burned in most years since then (3). Managers at Concord have a compelling reason to reintroduce fire. In addition to restoring a rare and declining natural community type, and reducing wildfire risk, their site is the only location in New Hampshire and the world's easternmost location known to support the Karner Blue Butterfly (4).
|Karner Blue (Lycaeides melissa samuelis), Concord, NH|
Thanks to Harry LeGrand for ID confirmation!
|Grassy open Pitch Pine Barren@Concord, New Hampshire|
|Karner Blue (?) perched on Dogbane (Apocynum cannabinum)@ Concord, New Hampshire|
It will be interesting to see what management activities, especially prescribed fires, are conducted across these barrens and the results they achieve. Reducing dangerous fuel loads while restoring more natural structure seems like a logical way forward (see below), but the real proof comes with fire.
|Brush piles from hand clearing around large Pitch Pine @ Concord, NH|