According to the investigation scale and the research purpose, the basic conditions for species-area curves on Loess Plateau have been analyzed. Four typical models were adopted in the study: (S=b+alnA,) S=aln(bA+1), S=aA~b, S=aA/(1+bA) . With the aid of SAS8.1 and MATLAB6.5 system, the first three models were fallen into disuse according to the F value of fitting curves. The model S=aA/(1+bA) was regarded as the standard curve to get second derivative species-area for the communities of Lespedeza davurica ...
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