Author: George T. FerrellPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 24
Book Description
Growth Classification Systems for Red Fir and White Fir in Northern California
Author: George T. FerrellPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 24
Book Description
Ten-year Risk-rating Systems for California Red Fir and White Fir
Author: George T. FerrellPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 18
Book Description
Risk-rating Systems for Mature Red Fir and White Fir in Northern California
Author: George T. FerrellPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 36
Book Description
Forestry Research West
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 276
Book Description
Resource values in analyzing fire management programs for economic efficiency
Author: Irene A. AlthausBlue Mountains Forest Health Report
Author: Publisher:
ISBN:
Category : Blue Mountains (Or. and Wash.)
Languages : en
Pages : 424
Book Description
Dynamics of Forest Insect Populations
Author: Alan A. BerrymanPublisher: Springer Science & Business Media
ISBN: 1489907890
Category : Science
Languages : en
Pages : 608
Book Description
Insects multiply. Destruction reigns. There is dismay, followed by outcry, and demands to Authority. Authority remembers its experts or appoints some: they ought to know. The experts advise a Cure. The Cure can be almost anything: holy water from Mecca, a Government Commis sion, a culture of bacteria, poison, prayers denunciatory or tactful, a new god, a trap, a Pied Piper. The Cures have only one thing in common: with a little patience they always work. They have never been known entirely to fail. Likewise they have never been known to prevent the next outbreak. For the cycle of abundance and scarcity has a rhythm of its own, and the Cures are applied just when the plague of insects is going to abate through its own loss of momentum. -Abridged, with insects in place of voles, from C. Elton, 1924, Voles, Mice and Lemmings, with permission of Oxford University Press This book is an enquiry into the "natural rhythms" of insect abundance in forested ecosystems and into the forces that give rise to these rhythms. Forests form unique environ ments for such studies because one can find them growing under relatively natural (pri meval) conditions as well as under the domination of human actions. Also, the slow growth and turnover rates of forested ecosystems enable us to investigate insect popula tion dynamics in a plant environment that remains relatively constant or changes only slowly, this in contrast to agricultural systems, where change is often drastic and frequent.
Forest Insects
Author: Alan A. BerrymanPublisher: Springer Science & Business Media
ISBN: 1468450808
Category : Science
Languages : en
Pages : 284
Book Description
This book is intended as a general text for undergraduates studying the manage ment of forest insect pests. It is divided into four parts: insects, ecology, manage ment, and practice. Part I, Insects, contains two chapters. The first is intended to provide an overview of the general attributes of insects. Recognizing that it is impossible to adequately treat such a diverse and complex group of organisms in such a short space, I have attempted to highlight those insectan characteristics that make them difficult animals to combat. I have also tried to expose the insects' weak points, those attributes that make them vulnerable to manipulation by human actions. Even so, this first chapter will seem inadequate and sketchy to many of my colleagues. Ideally, this book should be used in conjunction with a laboratory manual covering insect anatomy, physiology, biology, behavior, and classifica tion in much greater depth-in fact, this is how I organize my forest entomology course. It is hoped that this first chapter will provide nonentomologists with a general feel for the insects and with a broad understanding of their strengths and weaknesses, while Chapter 2 will provide a brief overview of the diverse insect fauna that attacks the various parts of forest trees and their products.
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1050
Book Description
Author: