Abstract: Based on the land use map of Hefei in 2002, and by using ArcView software and Fragstats 3.3 spatial analysis program, this paper studied the change characteristics of selected 22 landscape pattern indices of Hefei under effects of different grain size, and analyzed the fitting functions and variation coefficients of partial landscape indices. The results showed that with the grain size increased from 10 to 100 m, the selected indices displayed different change trend, illustrating that the change of grain size had obvious effects on landscape indices. The effects of the grain size could be classified as 4 kinds of situation, i.e., overall rise, overall drop, less change, and no regulation change. The response curves of landscape pattern indices to grain size were fitted by quadratic function, cubic function, power function, and linear function, respectively. For the 1:50000 land use map of Hefei, the suitable range of grain size for computing and analyzing landscape indices was 15-35 m.

Key words: landscape pattern index, grain size, scale domain, Hefei City, wheat, maize, intercropping, intercropping stage, eco-environment.