A Case Study of a Douglas-fir Tussock Moth Outbreak and Stand Conditions 10 Years Later PDF Download
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Author: Boyd E. Wickman
Publisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 30
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Book Description
Tree damage occurring immediately after an outbreak of Douglas-fir tussock moth, Orgyia Pseudotsugata McD., and stand conditions 10 years later are described. Because of increased radial growth and ingrowth in the 10-year postoutbreak period, good evidence indicates that tree damage caused by the tussock moth may not be as severe in the overall stand dynamics as previously pictured. The insect probably plays a key role as a phytophagous regulator of primary production in some second-growth white fir stands in California and elsewhere.
Author: Boyd E. Wickman
Publisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 30
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Book Description
Tree damage occurring immediately after an outbreak of Douglas-fir tussock moth, Orgyia Pseudotsugata McD., and stand conditions 10 years later are described. Because of increased radial growth and ingrowth in the 10-year postoutbreak period, good evidence indicates that tree damage caused by the tussock moth may not be as severe in the overall stand dynamics as previously pictured. The insect probably plays a key role as a phytophagous regulator of primary production in some second-growth white fir stands in California and elsewhere.
Author: George T. Ferrell
Publisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 16
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Book Description
Open-grown, pole-sized white firs defoliated by Modoc budworm (Choristoneura viridis) in northeastern California in the years 1959-62 and 1973-75 suffered only minor growth reductions and topkilling compared with the effects that more protracted budworm outbreaks have had elsewhere on their conifer hosts. Growth index analysis indicated that the firs averaged a cumulative height growth deficit of 14.5 percent, or 34 cm (1.1 ft), over both outbreaks. Firs heavily defoliated during the 1973-75 outbreak were more frequently topkilled and consequently suffered larger height growth deficits. Topkilling during both outbreaks, however, was limited to the terminal shoot, resulting in slight crooks or forks, but no decay, in the stems. Radial growth deficits attributable to the outbreaks were not found and, unless future outbreaks are more protracted or otherwise intensify, the Modoc budworm can be considered only a marginal economic pest of firs in California.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 526
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Author: Robert W. Campbell
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 360
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Author:
Publisher:
ISBN:
Category : Agricultural extension work
Languages : en
Pages : 356
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 544
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 392
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Author:
Publisher:
ISBN:
Category : Blue Mountains (Or. and Wash.)
Languages : en
Pages : 424
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Book Description
Author: L.R. Walker
Publisher: Elsevier
ISBN: 0080550843
Category : Science
Languages : en
Pages : 881
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Book Description
As the human population inexorably grows, its cumulative impact on the Earth's resources is hard to ignore. The ability of the Earth to support more humans is dependent on the ability of humans to manage natural resources wisely. Because disturbance alters resource levels, effective management requires understanding of the ecology of disturbance. This book is the first to take a global approach to the description of both natural and anthropogenic disturbance regimes that physically impact the ground. Natural disturbances such as erosion, volcanoes, wind, herbivory, flooding and drought plus anthropogenic disturbances such as foresty, grazing, mining, urbanization and military actions are considered. Both disturbance impacts and the biotic recovery are addressed as well as the interactions of different types of disturbance. Other chapters cover processes that are important to the understanding of disturbance of all types including soil processes, nutrient cycles, primary productivity, succession, animal behaviour and competition. Humans react to disturbances by avoiding, exacerbating, or restoring them or by passing environmental legislation. All of these issues are covered in this book.Managers need better predictive models and robust data-collections that help determine both site-specfic and generalized responses to disturbance. Multiple disturbances have a complex effect on both physical and biotic processes as they interact. This book provides a wealth of detail about the process of disturbance and recovery as well as a synthesis of the current state of knowledge about disturbance theory, with extensive documentation.
Author: Glenn LeRoy Crouch
Publisher:
ISBN:
Category : Conifers
Languages : en
Pages : 656
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Book Description
