Biodiversity and base values
نویسندگان
چکیده
منابع مشابه
The biodiversity values of European virgin forests
What makes virgin forests better forests? Biodiversity evaluation depends on the value systems of the stakeholders involved. Indicators for conservation value, ecosystem functions, wilderness, uniqueness, or species richness may not correlate, or even correlate negatively. Based on arthropod data from a comparative study in two types of virgin forests in core areas of the Carpathian Biosphere R...
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Although missing (or null) values are found in most data bases they are not formally recognized by existing DBMS. The correct manipulation of those values is then left to the applications programs. This paper extends and formalizes a model suggested by Codd (4) for the explicit recognition of missing values by the relational algebra. It also explores the implications of the model and discusses ...
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ژورنال
عنوان ژورنال: Oryx
سال: 1997
ISSN: 0030-6053,1365-3008
DOI: 10.1046/j.1365-3008.1997.d01-97.x