منابع مشابه
Fire in the Sierra Nevada
Fire has been described as both a major ecological force necessary for long-term functioning of Sierra Nevada ecosystems and as one of the greatest threats to human and natural resources (SNEP 1996a). Fire has shaped the terrestrial ecosystems of the Sierra Nevada for millennia. Before the mid-1800s, fires generally were frequent and mostly of low to moderate intensity, from lower-elevation blu...
متن کاملManaging Sierra Nevada Forests
Fire will continue to be a major management challenge in mixed-conifer forests in the Sierra Nevada. Fire is a fundamental ecosystem process in these forests that was largely eliminated in the 20th century. Fire reintroduction is a critical goal but is subject to constraints such as smoke production, risk of fire moving outside designated boundaries, the expanding wildland-urban interface, and ...
متن کاملManaging Sierra Nevada Forests
1 Research ecologist, U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station, 1731 Research Park Dr., Davis, CA 95618. 2 Information Center for the Environment, Department of Environmental Science and Policy, One Shields Ave., University of California, Davis, Davis, CA 95616. 3 National coordinator for experimental forests and ranges, U.S. Department of Agriculture, ...
متن کاملNumic Expansion in the Southern Sierra Nevada
Recent research indicates that late prehistoric Numic expansion onto the western slope of the southern Sierra Nevada was facilitated by a competitive edge held by migrating groups, mainly Great Basinderived settlement and subsistence behaviors finetuned to the uncertainties of living in Little Ice Age mountain environments. But ethnographic, linguistic, and archaeological evidence also sugges...
متن کاملRoof Pendants of the Sierra Nevada
The Sierra Nevada mountain range consists of a vast array of different geologic features. One of these features is in the form of what are known as roof pendants. Roof pendants span through the central and southern portions of the eastern Sierra Nevada. Representing the geologic history of the Sierra Nevada mountain range in California, metamorphic roof pendants offer a glimpse into the past. T...
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ژورنال
عنوان ژورنال: Nature
سال: 1872
ISSN: 0028-0836,1476-4687
DOI: 10.1038/006078a0