Abstract: Based on the observation of the development and reproduction of experi mental populations of alpharmethrin-resistant and susceptible Bactrocera dor salis strains at (28±2) ℃, the life tables of the populations were establish ed, and the differences in the relative ecological fitness of the two strains wa s analyzed. The results showed that comparing with alpharmethrin-susceptible B. dorsalis strain, the resistant one had longer durations of development st ages, average generation, and previposition, its fecundity was not stable and lo wer, and the hatch of eggs and the emergence of adults were depressed. The fecun dity of the susceptible and resistant strains was 3240 and 2407, respectivel y. Based on the life tables, the population trend index (I) of resistant str ain was 7910, while that of susceptible strain was 11697. The net reproducti on rate (R0) and the intrinsic rate of increase (rm) of resistant st rain were 141400 and 79463, while those of susceptible strain were 218400 and 83809, respectively. The relation fitness of resistant strain was only 06474. All of the results revealed that the resistant strain was at an obvious inferior position of reproduction and development.

Key words: desert vegetation coverage, multi-source remote sensing data, remote sensing model,  , scale conversion.