Arthropod Community Structure and Its Stability in Perennial Rice Field

PurposeTo clarify the composition of arthropod community in perennial rice field, analyze its community characteristics and stability, and provide scientific basis for integrated pest management in perennial rice planting.

MethodThe five points sampling method, incorporating sweep sampling, plate beating, visual inspection and trapping were used to record the number of arthropod in perennial and conventional rice fields, and the community characteristics of arthropods in perennial rice field were analyzed by using community characteristic index and principal component analysis.

ResultThere were 17 species of pest and 20 species of enemy in the first season of perennial rice, and there were 15 species of pest and 27 species of enemy in the second season. The individual number of pests in perennial rice field was higher than that of conventional rice in the same year, and the individual number of pests in the second season of perennial rice field was higher than that of the first season. The diversity index and evenness index of arthropod community in the second season of perennial rice field were slightly lower than those in the first season, and the dominance index and dominance concentration index were higher than those in the first season. The values of S_s/S_i, S_p/S_b and S_a/S_b of arthropod community in the second season of perennial rice field were significantly lower than those in the first season and conventional rice field (P<0.05), while the values of S_n/S_p and S_n/S_a were significantly higher than those in the first season and conventional rice field (P<0.05). With the increase of planting season, the most important factors for the change of arthropod community in perennial rice field changed from the comprehensive factors of species number of sucking pests and individual number of leaf roller pests, borer pests and predatory enemies in the first season to comprehensive factors of the species number and individual number of sucking pests and leaf roller pests and species number of leaf-feeding pests and predatory enemies in the second season.

ConclusionThe number of pests in the second season of perennial rice was higher, and the stability of arthropod community was lower than that in the first season. With the increase of planting season of perennial rice, the sucking pests, leaf roller pests and borer pests should be focused on prevention and control to ensure the safe production of perennial rice.