Prof. Emeritus, Nagasaki University, Menoto 2-34-12, Nagasaki 852-8144
The PABITRA field comprises a variety of vegetation from the west to the east in the Pacific. A simple and easy method measuring species-richness is needed as a PABITRA baseline study, to compare the vegetation structure under the situation of varied flora. Minimum task in field is a sampling of 100, or more, individuals with species discrimination (unnecessary with identification of taxonomic name). The sampling can be carried out with quadrat method, or with random sampling in a trail walking in a plant community. Then you can have a data of total number of species (S) in a collection of N individuals. Two indices of species diversity can be easily calculated. 1) Fisher’s alpha (a): The value means the theoretical number of species represented by a single individual in the biotic community, and can be calculated by the formula, S a ln (N/a + 1). 2) Hurlbert’s S(100): The value means the number of species found in a collection of 100 individuals. The most simple community will be S1, while the most species-rich community is S100. For the data comprising more than 100 individuals, the value can be calculated by the formula, S’(100) = S [1 - (1 - 100/N) xi] where N = S xi.
Abstract from: 43rd Symposium of the International Association for Vegetation Science, July 23-28, 2000, Nagano, Japan.
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Last Updated: 08/18/00