History and status of Table Mountain pine pitch pine
forests of the southern Appalachian Mountains (USA).
However, pitch pine sites 1, 3, and 4 were probably highly nitrogen deficient based on their substrate (sand or bedrock) combined with low concentrations of extractable nitrogen in the mineral soil and forest floor (at sites 1,3 and 4 extractable N[O.
2] fixation in the rhizosphere of red pine and pitch pine.
The range of nitrogenase activities obtained for pitch pine, red pine, and white pine in Maine is in good agreement with other recent field studies that also used CO controls.
Plots with low values for Axis 1 are dominated by scrub oak or mixed forest, whereas those characterized by pitch pine, grey birch, aspen, or grasslands have high values.
Depth of the O horizon is identified as a second explanatory variable, with the deepest organic layers in pitch pine stands (Type 3) that have moderate to low Axis 1 values, and the most shallow ones in open grasslands and aspen stands (Type 1) with high values.
Pitch pine forests in the Connecticut Valley were widely "boxed" for tar and turpentine production, with legislation regulating these activities as early as the late 17th century (Judd 1905, Hawes 1923).
When nature does the job unaided, the intense heat of a forest fire is needed for pitch pine
cones to open and release their seeds.
He suggested that areas dominated by scrub oak (Quercus ilicifolia) with scattered pitch pine were characteristic of very disturbed sites, especially those that burned often.
These dwarf ridge top communities graded into taller pitch pine and oak forests on the slopes of the mountain.
This paper describes pine communities that surround the Adirondack Mountains in northeastern New York near the northern limit of pitch pine [ILLUSTRATION FOR FIGURE 1 OMITTED].
The first (Seischab and Bernard, 1991) focused on pitch pine barrens in central and western New York.