Abstract: By the methods of bait (honey, peanut oil, sausage, and mealworm larvae) trap, this paper studied the searching time, recruitment time, and recruitment number of ants in 3 typical habitats invaded and un-nvaded by red imported fire ant (Solenopsis invicta) in South China, and analyzed the effects of S. invicta invasion on the foraging intensity of native ants. In S. invicta invaded lawn, the searching time of ants for mealworm larvae and peanut oil was significantly shorter, compared with that in S. invicta un-nvaded area. Less difference was observed in the searching time for the 4 baits between S. invicta invaded and un-nvaded wasteland, but the recruitment time for peanut oil was significantly longer in invaded than in un-nvaded area. The searching time and recruitment time of the ants for the 4 baits had less difference between the invaded and un-nvaded litchi orchard. 30 min after setting bait traps, the recruitment number of S. invicta workers on peanut oil, mealworm larvae, and sausage in invaded lawn, and on peanut oil in invaded wasteland was larger than that of native ants, but no significant difference was found in the recruitment number of S. invicta
 workers and native ants on the baits in invaded litchi orchard.

Key words: Solenopsis invicta Buren, native ant, searching time, recruitment time, recruitment number, residues, simulated field rainfall experiment, runoff yield, sediment yield, water and sediment reductions, Shenfu-Dongsheng Coalfield.