Reducing Mountain Pine Beetle-caused Mortality in Ponderosa Pine Plantations PDF Download
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Author: Bruce Erickson
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 12
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Author: Bruce Erickson
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 12
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Author: William F. McCambridge
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 12
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Book Description
From 1965 to 1978, mountain pine beetles killed 25% of the pines taller than 4.5 feet in a study area in north-central Colorado. Average basal area was reduced from 92 to 58 square feet per acre. Mortality increased with tree diameter up to about 9 inches d.b.h. Larger trees appeared to be killed at random. Mortality was directly related to number of trees per acre and presence of dwarf mistletoe, but not to site index, elevation, and percent Douglas-fir in the stand.
Author: Charles Sartwell
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 8
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Author: William F. McCambridge
Publisher:
ISBN:
Category : Forest thinning
Languages : en
Pages : 4
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Author: J. M. Schmid
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 4
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Author:
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 20
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Ten-year diameter and basal area growth were determined for partially cut stands at 4 locations. Average diameters in the partially cut plots generally increased by 1 inch or more, while average diameter in the uncut controls increased by 0.9 inches or less. Individual tree growth is discussed in relation to potential susceptibility to mountain pine beetle infestation. Basal area increases ranged from 0.9 to 1.9 ft2/acre/ yr in partially cut plots, while basal area increases in the control plots ranged from 0.4 to 1.4 ft2/acre/yr. Endemic mountain pine beetle infestations and snow breakage accounted for most of the mortality on the plots, which decreased the residual basal area and basal area growth. Increases in basal area are used to estimate the length of time required for various stand densities to reach the susceptibility thresholds for mountain pine beetle infestation. Stand marking may influence future susceptibility to beetle infestations.
Author:
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 19
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Author: J. M. Schmid
Publisher:
ISBN:
Category : Black Hills National Forest (S.D. and Wyo.)
Languages : en
Pages : 16
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Author:
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 19
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Ponderosa pine stands were partially cut to various stocking levels at five locations, periodically surveyed, and remeasured during the 20 years after installation. Mean diameter generally increased 2 inches over the 20-year period on most partially cut plots and less than 2 inches on unmanaged controls. Average diameter growth for diameter classes in partially cut plots was generally significantly greater than average diameter growth for the same diameter classes in uncut control plots. Basal area increased 20 to 40 ft2/acre in partially cut plots and 5 to 21 ft2/acre in unmanaged controls at four locations over a 20-year period. Beetle-caused mortality ranged from 0 to 51 percent of the trees in partially cut plots and from 1 to 77 percent of the trees in control plots although mortality was generally 8 percent in partially cut plots. Beetles attacked trees ranging from 8 to 18 inches in partially cut stands and from 7 to 19 inches in unmanaged stands. Beetles did not exclusively attack16-inch diameter trees, so some trees>16 inches may be selected as leave trees. However, if an infestation persisted in a stand, trees in diameter classes>16 had the highest percentage mortality. The effectiveness of partial cutting for minimizing mountain pine beetle-caused mortality is influenced by: residual stocking level, size of the partial cut, amount of time since the area was cut, and proximity of beetle populations. Partial cuts of
Author:
Publisher:
ISBN:
Category : Forest thinning
Languages : en
Pages : 16
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