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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 35 (1913), S. 1505-1524 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 9 (1985), S. 479-485 
    ISSN: 1432-1009
    Keywords: National parks ; Management fire ; Rescue ecology ; Standards for naturalness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract National park resource management planning requires ecological information describing the objectives to be achieved. This information must be quantitative and unambiguous. Since most acts creating United States national parks, beginning with the Yellowstone National Park Act of 1872, specify that these parks should be maintained in a natural condition, resource management objectives for each national park must be defined in terms of quantitative standards of naturalness. Such quantitative standards of naturalness do not yet exist for any national park in the United States. Although this article focuses on US national parks, the same problem exists in national parks, reserves, and wilderness areas throughout the world. The physical evidence needed to develop quantitative standards of naturalness is rapidly disappearing because of the effects of management fires, wildfires, decomposition, successional changes, and other disturbances. Therefore, a nationwide “rescue ecology” program is recommended to recover as much remaining ecological information as possible before it is lost. This information is essential for developing quantitative standards to restore naturalness to national parks.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The spacecraft Voyager 1 is at a distance greater than 85 au from the Sun, in the vicinity of the termination shock that marks the abrupt slowing of the supersonic solar wind and the beginning of the extended and unexplored distant heliosphere. This shock is expected to ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 6 (1982), S. 109-122 
    ISSN: 1432-1009
    Keywords: Vegetation management policy ; Fire management ; National Parks ; Mixed-conifer forest ; Presettlement vegetation ; Aggregation ; Forest simulation ; Forest succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The development of U.S. national park vegetation management policies is briefly traced from 1872, when Yellowstone National Park was created, to the present. Ambiguities in legislative policies are described and partially resolved. Alternative vegetation management objectives, consistent with those policies, are evaluated using quantitative data from a giant sequoia-mixed-conifer forest community in Kings Canyon National Park. It is concluded from an analysis of this data that structural maintenance objectives are biologically infeasible in this forest community because the community does not have a fully regulated or steady-state distribution of aggregation types. Since such a steady-state distribution of aggregation types is probably not present in most forest communities, the Park Service is generally restricted to pursuing process maintenance objectives for vegetation within national parks and monuments. It is also pointed out that implementation of some process maintenance objectives is complicated by the need to return the forest community to its pre-fire exclusion state before reintroducing fire to the ecosystem. To do otherwise would perpetuate the changes in species composition and structure that have resulted from more than three-quarters of a century of fire exclusion. A new alternative for managing vegetation in national parks that is based on a high resolution description of the presettlement forest community, called the reconstruction-simulation approach, is also presented.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 6 (1982), S. 101-102 
    ISSN: 1432-1009
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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