The application of species-area curves to measurements of species diversity in grasslands using the randomized-order method
2009
Itano, S.(National Inst. of Livestock and Grassland Science, Nasushiobara, Tochigi (Japan)) | Shimoda, K. | Tomimatsu, H.. | Tsutsumi, M.
In an effort to appropriately manage and preserve grasslands, the application of species-area curves using the randomized-order method was examined for species diversity measurements. First, surveyed orders were permuted using repeated random number generation and, on average, a typical species-area relationship was generated. A power function model was then fit to the curves and three diversity indices were compared: minimal area (Aalpha), species richness (Salpha), and the appearance pattern (z) resulting from the model. We investigated Zoysia-dominated pastures to test simulations using several treatments and to compare methods. The results indicated that the randomized-order method produced highly precise species-area curves and that the effects of survey and stand area on the curves and indices were minimal. This method offers an improvement over species-area relationships generated from surveyed orders and over other species diversity indices, and is thus useful for evaluating species diversity in grasslands.
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