Abstract:

In order to evaluate the effect of the cropping pattern applied refuge on arthropod community in Bt rice paddy, the survey was conducted with the block cropping pattern, in which the block of refuge was along side the block of Bt rice, and the mixed cropping pattern, in which rows of refuge was planting within rows of transgenic Bt rice. The results showed that there was no significantly difference in diversity, evenness and dominant concentration of arthropod communities between two cropping patterns during the whole period of rice growth, but the species richness and individual density of arthropods in the mixed cropping pattern were significantly lower than those in the block cropping pattern. Furthermore,  the dynamics of diversity, evenness and dominant concentration of arthropod community in Bt rice paddy under the mixed cropping pattern were remarkably different with those under the block cropping pattern, but similar to those in nonBt rice refuge during the middle period of rice growth. This suggests that the mixed cropping pattern is more effective than the block cropping pattern.

Key words: Transgenic Bt rice, cropping pattern, refuge, arthr