Susceptibility and Risk Rating Systems for the Mountain Pine Beetle in Lodgepole Pine Stands PDF Download
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Author: Terence Leckie Shore
Publisher:
ISBN: 9780662196181
Category : Lodgepole pine
Languages : en
Pages : 12
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Book Description
Author: Terence Leckie Shore
Publisher:
ISBN: 9780662196181
Category : Lodgepole pine
Languages : en
Pages : 12
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Book Description
Author: Judith E. Pasek
Publisher: Forgotten Books
ISBN: 9781396784101
Category : Business & Economics
Languages : en
Pages : 78
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Book Description
Excerpt from Comparison of Risk/Hazard Rating Systems for Mountain Pine Beetle in Black Hills Ponderosa Pine Forests Stevens et al. (1980) described a system for rating ponderosa pine stands in the Black Hills for susceptibility to mountain pine beetle (mpb), Dendroctonus ponderosae Hopkins, using parameters of stand structure (one or two-storied), average diameter at breast height (deh), and average basal area (ba). This mpb risk-rating system was incorporated into a model subroutine called ponbug, which is linked to the Rocky Mountain Resource Inventory System (rmris) database used by National Forests in the Rocky Mountain Region, so that mpb risk could be automatically calculated in the program called rmstand. Results can be displayed in the optional field bug_risk in the table r2ris_site. Values of 1, 3, and 5 indicate low, medium, and high mpb stand risk, respectively. The program was modified in 1993 for the Black Hills and Nebraska National Forests based upon results of Schmid and Mata They suggested that 120 sq. Ft. Per acre may be the critical BA for separating high risk stands of susceptible-sized trees in the Black Hills, rather than 150 sq. Ft. Per acre. This risk-rating program is often used by district personnel during project planning to help prioritize pine stands for thinning or harvesting. As Rapid City Service Center staff became involved in assisting district personnel with analyses of mpb risk, it became apparent that the ponbug model did not always produce the same results as hand calculations of the method published by Stevens et al. Closer examination of the computer program ponbug revealed that it used average diameter and BA of trees 2 1 inch qmd (quadratic mean diameter, an estimate of average stand diameter) rather than those for trees 2 5 inches in diameter, as specified by Stevens et ai. In addition, Stevens et al. (1980) did not define one-storied and two storied stand structure in their rating system. In order to use the stand structure parameter in the ponbug model, a stand was designated as two-storied if BA of trees 2 1 inch qmd was 30 sq. Ft. Per acre and number of live trees between 1 and 5 inches qmd was 250 per acre. Stands without these conditions were designated as one-storied. By this method, most stands in the Black Hills would be designated as one-storied. Whether or not this is an accurate portrayal of stand structures of ponderosa pine in the Black Hills is debatable. The ponbug designations for stand structure may not represent what Stevens et al. (1980) envisioned when they described their rating system. The omission of trees smaller than 5 inches deh from their model suggests that they considered such small trees to be unimportant for risk rating mountain pine beetle susceptibility and may also reflect a scarcity of such trees in stands of high risk. Their two-storied stands were likely to contain scattered mature trees with an understory of pole-sized trees, typical of stands found some years following shelterwood or seed tree harvesting. A quantitative means of describing such stands for use in risk/hazard rating systems for mountain pine beetle in ponderosa pine has not been developed to date. 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: Colin Robertson
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 34
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Book Description
In western Canada, the operational risk rating system for mountain pine beetle is based on biological knowledge gained from a rich legacy of stand-scale field studies. Owing to the large spatial and temporal extents of the current epidemic, new research into large-area mountain pine beetle processes has revealed further insights into the landscape-scale characteristics of beetle infested forests. This research evaluates the potential for this new knowledge to augment an established system for rating the short-term risk of tree mortality in a stand due to mountain pine beetle.--Publisher's website.
Author: S. A. Mata
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 24
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Book Description
Periodic diameter and basal area growth were determined for partially cut stands of lodgepole pine at five locations over approximately 10 year periods. After cutting, average diameters in the partially cut plots generally increased by 0.8 inches or more, while average diameter in the uncut controls increased by 0.6 inches or less. Diameter growth in the partially cut plots was generally significantly greater than diameter growth in the controls. Individual tree growth is discussed in relation to potential susceptibility to mountain pine beetle infestation. Basal area decreased in three of the four GSL (growing stock level) 40 stands because of windthrow. Basal area generally increased >1.0 ft 2 / acre/year in partially cut plots except in the GSL 40 stands with substantial windthrow and one GSL 100 with an Armillaria infection pocket. Basal area increases in the control plots ranged from 0.2 to 1.1 ft 2 /acre/year, although the one control with a BA growth rate of 1.1 ft 2 /acre/year had a relatively low initial BA. Data from the stands are employed in the susceptibility rating methods of Amman et al.(1977), Shore and Safranyik (1992),and Anhold et al. (1996 to determine stand susceptibility and the results discussed in terms of general applicability of these methods to partially cut stands. Basal area growth is used to estimate the length of time required for various stand densities to reach specific susceptibility thresholds for mountain pine beetle infestation. Several of the GSL 40 stands are not projected to reach the susceptibility thresholds in 100 years because of windthrow. Barring mortality 1%,GSL 80 stands are estimated to reach the basal area threshold of 120 ft 2 per acre in
Author: Swaby J.
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 31
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Author: David C. Chojnacky
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 16
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Book Description
Two empirical methods for rating susceptibility of mountain pine beetle attack in ponderosa pine were evaluated. The methods were compared to stand data modeled to objectively rate each sampled stand for susceptibly to bark-beetle attack. Data on bark-beetle attacks, from a survey of 45 sites throughout the Colorado Plateau, were modeled using logistic regression to estimate the probability of attack on individual trees from tree and stand variables. The logistic model allowed flexibility to easily scale results up to a stand level for comparison to the empirical methods. The empirical method, developed by Munson and Anhold, most closely correlated to the logistic regression results. However, the Munson/Anhold method rated all 45 study sites as either moderately or highly susceptible to bark-beetle attack, which raises concern about its lack of sensitivity. Future work on evaluating risk of bark-beetle impact should consider more than stand characteristics.
Author: Walter E. Cole
Publisher:
ISBN:
Category : Insect pests
Languages : en
Pages : 64
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Author: Caren C. Dymond
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 20
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Book Description
This study is part of a series of research papers that explore the biological, social, and economic aspects of British Columbia's mountain pine beetle epidemic. In this paper, an established decision support system was evaluated for operational use. Digital forest inventory and beetle-impact survey data were integrated in standard GIS software for rating susceptibility and risk of mountain pine beetle infestation. The beetle-impact data, collected over a three-year period, provided an opportunity to generate risk on a given year and compare it to attacks in the subsequent year.--Includes text from Government of Canada publications site and from document.
Author: Philip Cornwell Johnson
Publisher:
ISBN:
Category : Bark beetles
Languages : en
Pages : 44
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Book Description
Author: Robert S. Loveless
Publisher:
ISBN:
Category : Mountain pine beetle
Languages : en
Pages : 84
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Book Description
