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"The practice and process of assessing trees for risk is detailed in ISA's Tree Risk Assessment Manual. This new manual is a valuable tool for both the expert and novice risk assessor, and will quickly become one of the most referenced resources on your bookshelf. As the companion publication for the Tree Risk Assessment Qualification course, the manual highlights the critical steps in the risk assessment process - from site analysis to risk evaluation and communicating risk to clients (and everything in between). This publication can be used as a resource to study for the qualification course, as a step-by-step guide to conducting a tree risk assessment, and as a desktop reference for writing reports. A Basic Tree Risk Assessment Form is included, along with a list of common wood decay fungi, and a useful glossary of risk assessment terms."--Publisher description
Tree species are ecologically, culturally and economically valuable components of biodiversity and their conservation is essential to the well-being of people in all countries of the world. With increasing general pressures on ecosystems and selective pressures on species, it has become apparent that many tree species are threatened with extinction. The world list of threatened trees presents the results of the first survey of the conservation status of tree species worldwide.
Discover the secrets and beauty of the world’s rarest trees in this fantastic book filled with more than 300 color photographs. Forests cover nearly a third of the world's surface, and the trees that make them up include a staggering diversity of more than 60,000 species. Individual trees play specific ecological roles in their unique environments—and they have adapted to thrive on steep mountains, in cloud forests, on dry savannahs, in parched deserts, and in tropical wetlands. Our history, and our future, are interwoven with the trees that define the regions of our green planet. Rare Trees profiles over 60 unique species that are currently endangered—including the most charismatic, fascinating, and downright bizarre examples from all around the globe. Filled with hundreds of color photographs, maps to help readers identify habitats, and accessible and engaging text by tree experts from the Global Trees Campaign, Rare Trees will give readers a new appreciation for the importance of trees and will inspire them to preserve this critical canopy of life.
Defective trees are potential hazards to people and property in recreation areas. Most reported tree failures within recreation sites in the Rocky Mountain Region occur in lodgepole pine. Defective root systems account for the greatest percentage of failures. External indicators of defects are used to identify trees that may fail. Some tree species, particularly aspen, are highly susceptible to visitor damage; managers should restrict recreational development in such forest types. Old growth spruce-fir stands should also be avoided for developed sites. Systematic, annual, documented inspections of trees in recreation sites and corrective action are recommended to reduce hazards to the public.