Search results
Results from the WOW.Com Content Network
Prior to 1950, independent volunteer fire companies protected Arlington County. [5] As the demand for services for fire and EMS grew, the need for full-time paid staff was acknowledged by the County. Staff was hired, first to augment the volunteers, then finally to provide the full range of services required in a modern, urban, fire department.
The typical life span is 65 to 90 years. [2] The short (4–8 cm), yellow-green needles are paired in fascicles and are often twisted. Pinecones are 4–7 cm long and may persist on the tree for many years, often (though not always) releasing their seeds in the second year. In growth habit, some trees may be inclined with twisted trunks.
Open-growth trees begin bearing cones in as little as three years, with shade-inhabiting pines taking a few years longer. Cones take two years to mature. Seed dispersal occurs over the fall and winter, and trees cannot self-pollinate. The lifespan of a pitch pine is about 200 years or longer. [citation needed] Pitch Pine being trained as bonsai ...
This pine often forms pure stands on sandy or rocky soil. Many populations are adapted to stand-replacing fires, with the cones remaining closed for many years, until a forest fire kills the mature trees and opens the cones, reseeding the burnt ground. Other populations have not been shaped by regular stand-replacing fires and have reduced ...
The fire cycle for ponderosa pine is 5 to 10 years, in which a natural ignition sparks a low-intensity fire. [50] Low, once-a-decade fires are known to have helped specimens live for half a millennium or more. [14] The tree has thick bark, and its buds are protected by needles, allowing even some younger individuals to survive weaker fires. [14]
Pinus contorta is a fire-dependent species, requiring wildfires to maintain healthy populations of diverse ages. The thin bark of the lodgepole pine minimizes its defense to fire, although the heat of fire opens the cones to release the seeds. This allows the species to regenerate and maintain its place in the forest habitat. [20]
Map of Virginia. Buildings, sites, districts, and objects in Virginia listed on the National Register of Historic Places: . As of September 18, 2017, there are 3,027 properties and districts listed on the National Register of Historic Places in all 95 Virginia counties and 37 of the 38 independent cities, including 120 National Historic Landmarks and National Historic Landmark Districts, four ...
This image is a derivative work of the following images: Virginia counties and independent cities map.gif licensed with Cc-by-sa-3.0-migrated-with-disclaimers, GFDL-en 2006-10-16T20:34:33Z JosN 1009x491 (71702 Bytes) Map of Virginia counties and independant cities. Map of Virginia highlighting Floyd County.svg licensed with PD-self