By George A. Petrides
Этот иллюстрированный определитель включает детальные описания 387 видов, объединенных в 6 групп по внешнему сходству. forty seven цветных вкладок и текстовые описания характеризуют особенности видов, необходимые для идентификации. Цветные фотографии и 295 карт распространения дополняют видовые описания.
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Additional info for A Field Guide to Western Trees: Western United States and Canada
Even if we could allow all lightning fires to burn everywhere—a practical impossibility—the landscape-scale modification and fragmentation of fuels brought about by livestock grazing, development, and roads now greatly constrain the natural spread of fire. Probably half of all western forests have missed natural fire cycles while also having been altered by logging, so lightning fires today burn hotter and cause greater mortality than fires of the past. The Nature Conservancy, Defenders of Wildlife, and the Rocky Mountain Elk Foundation are among the leading conservation organizations that recognize the need for prescribed burning and tree thinning to restore western forests (Brown 2001, Stalling 2003,Wilkinson 2001).
Conservation and management of habitat, along with regulated harvest based on scientific recommendations, has been essential for restoring abundant free-ranging wildlife. Carefully crafted management can also provide the critical link for restoring fire-prone forests. Objectives for treating fire-prone forests may include restoring primeval conditions in large roadless areas or wilderness, developing sustainable conditions in accessible public forestlands, or creating lowhazard, attractive environments in private forestlands and around homes.
However, this simply continues the failed practices that attempt to largely exclude fire from fire-dependent forests. Biologists are wrestling with the highly complex considerations involved in restoring entire ecosystems. In contrast, we do understand the general role of fire in shaping forest structure; this knowledge serves as the basis for designing restoration forestry. The only available course for returning fire as a beneficial ecological process in western forests is through carefully planned restoration forestry, whether it employs natural fires, prescribed fires, cutting treatments, fuel removal, or some combination of these.
A Field Guide to Western Trees: Western United States and Canada by George A. Petrides