Post 01167
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Old trees may carry hundreds or even thousands of seed-filled cones. Once I counted 14,137 of these on the arms of one veteran lodge-pole. If we allow but twenty seeds to the cone, this tree alone held a good seed-reserve. Commonly a forest fire does not consume the tree it kills. With a lodge-pole it usually burns off the twigs and the foliage, leaving many of the cones unconsumed. The cones are excellent fire-resisters, and their seeds usually escape injury, even though the cones be charred. The heat, however, melts the resinous sealing-wax that holds the cone-scales closed. I have known the heat of a forest fire to be so intense as to break the seals on cones that were more than one hundred feet beyond the side line of the fire.
In most cases the seedlings spring up on a burned-over area the year following the fire. Often they stand as thickly as grain in the field. Under favorable conditions as many as one hundred and fifty thousand will appear upon an acre, and a stand of fifty thousand to the acre is not uncommon. Starting in a close, even growth, they usually suppress for years all other species of trees and most other plants. Their growth is mostly upward–about the only direction possible for expansion–with moderate rapidity. In a few years they are tall but exceedingly slender, and they become poles in from twenty-five to fifty years. The trappers named this tree lodge-pole because of its common use by the Indians for lodge, or tepee, poles.
In overcrowded stands, especially those in which groups or individual trees have slight advantages over their neighbors, a heavy percentage of the growth may die annually for the want of nutrition. If equal opportunities prevail in a crowded tract, all will grow slowly until some have an advantage; these will then grow more rapidly, and shade and suppress neighboring competitors.