Historical Patterns of Western Spruce Budworm and Douglas-fir Tussock Moth Outbreaks in the Northern Blue Mountains, Oregon, Since A.D. 1700 PDF Download
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Author:
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ISBN:
Category : Dendrochronology
Languages : en
Pages : 38
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Author:
Publisher:
ISBN:
Category : Dendrochronology
Languages : en
Pages : 38
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Author: Thomas W. Swetnam
Publisher: Forgotten Books
ISBN: 9780331410006
Category : Business & Economics
Languages : en
Pages : 42
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Excerpt from Historical Patterns of Western Spruce Budworm and Douglas-Fir Tussock Moth Outbreaks in the Northern Blue Mountains, Oregon, Since A. D. 1700 The objectives of this study were to reconstruct and analyze a multicentury history of budworm and tussock moth outbreaks in old-growth mixed-conifer stands of the north ern Blue Mountains and Eagle Cap edemess in northeastern Oregon. We were par ticularly interested in assessing possible changes in outbreak dynamics in the 2oth century relative to previous centuries. Our starting point for this study was observa tions of radial growth responses to defoliation by these two insects in previous tree ring studies conducted within the region (brubaker 1978; Brubaker and Greene 1979; Vcman 1980, From this work it was evident that characteristic tree-ring pat terns (hereafter called signatures) caused by budworms and tussock moths might be detected and isolated in radial increment time series. Following this lead, we applied dendrochronological methods developed and demonstrated in the southern Rocky Mountains (swetnam and others 1985; Swetnam and Lynch 1989, 1993) to tree-ring collections from the Blue Mountains. In this paper, we describe the results of our investigations in the northern Blue Mountains; we focused primarily on the historical patterns of change in regional-scale outbreaks among all sampled stands. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author:
Publisher:
ISBN:
Category : Dendrochronology
Languages : en
Pages : 27
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Author: Thomas W. Swetnam
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Author:
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ISBN:
Category : Forests and forestry
Languages : en
Pages : 418
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Author:
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ISBN:
Category : Forests and forestry
Languages : en
Pages : 974
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Author: Robert R. Mason
Publisher:
ISBN:
Category : Douglas fir tussock moth
Languages : en
Pages : 32
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Procedures for monitoring larval populations of the Douglas-fir tussock moth and the western spruce budworm are recommended based on many years experience in sampling these species in eastern Oregon and Washington. It is shown that statistically reliable estimates of larval density can be made for a population by sampling host trees in a series of permanent plots in a geographical monitoring unit. The most practical method is to estimate simultaneously densities on a plot of both insect species by the nondestructive sampling of foliage on lower crown branches of host trees. This can be done either by counting all larvae on sample branches or by estimating the frequency of occurrence of a selected threshold number of larvae in samples. Statistics are given on the expected within- and between-plot variances and the number of sample plots needed in different sized monitoring units. In large monitoring units, plot densities of tussock moth and budworm larvae usually are not normally distributed, but they can be normalized by logarithmic transformation to predict the probability of subpopulations of any given density occurring somewhere in the unit. It is urged that sampling methods be consistent and that monitoring be done annually to accumulate continuous databases that reflect the behavior of defoliator populations over a long period.
Author: Katharine A. Sheehan
Publisher:
ISBN:
Category : Forest insects
Languages : en
Pages : 40
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 612
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 398
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