Abstract:

Focusing on the ecological controlling technique and strategy for the Japanese wax scale(Ceroplastes japonicus), the structural features of the jujube orchard plant communities and landscapes were studied,and the relationships among the plant communities,the landscape and the outbreak of the Japanese wax scale were analyzed through community characteristic indices and the canonical correlations analysis.The results showed that the various jujube orchard plant communities fell into two categories according to the community similarity:plain regions and hill regions.The plain region plant communities had lower diversity and evenness,and severer damage imposed by the Japanese wax scale,while the hill region plant communities had higher diversity and evenness,and milder damage imposed by the Japanese wax scale.The canonical correlations analysis proved that the outbreak intensity of the Japanses wax scale was significantly correlated with the characters of the plant community.The landscape characteristic indices,showed the same discrepancy between plain regions and hill regions plant communities.Among the landscape characters,the landscape diversity had the strongest influence on the outbreak intensity of the Japanese wax scale.The hill regions had higher landscape diversity,larger wilderness areas,and the lower outbreak intensity of the Japanese wax scale.

Key words: Jujube orchard, Ceroplastes japonicus, plant communities, landscape