有机化梨园节肢动物群落时间动态的聚类分析
Cluster analysis on the temporal dynamics of arthropod community in organic pear orchards
李依林1**,陶万强2,张志勇1***,魏钦平3,杨宝东1,张民照1
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作者单位：1北京农学院植物科学技术系 102206；2北京市林业保护站 北京 100029；3北京市农林科学院林业果树研究所 100093
中文关键词：有机化梨园;节肢动物群落;时间动态;聚类分析
英文关键词：organic pear orchard, arthropod community, temporal dynamics, cluster
中文摘要：对北京顺义地区有机化梨园中2个不同栽培区节肢动物总群落、害虫及天敌亚群落分别进行时间动态的系统聚类。结果表明，在同一园区内，稀植区和密植区均以木虱为优势种类，相对丰盛度分别达0.3801、0.3300。总群落的24次调查结果稀植区可聚为5类，D=1.87，密植区聚为3类，D=1.80；害虫亚群落调查结果，当两区D=1.80时，稀植区可聚为3类密植区可聚为4类；天敌亚群落调查结果稀植区聚为4类，D=2.12，密植区聚为5类，D=1.75。在早春的密植区和入秋的稀植区木虱发生量大，应加强监测，及时防治。
英文摘要：By the method of fuzzy clustering, the temporal dynamics of the arthropod community and sub-communities in two different management areas in organic pear orchards were studied in Shunyi, Beijing. The results showed that Psyllidaes were the predominant insects in sparsely- and densely-planted areas, and their relative abundances were 0.3801 and 03300, respectively. The total community could be grouped into 5 clusters (D=1.87) in planted areas and 3 clusters (D=1.80) in densely-planted areas. The pest sub-communities could be grouped into 3 clusters (D=1.80) in sparsely-planted areas and 4 clusters (D=1.80) in densely-planted areas. The natural enemy sub-communities could be grouped into 4clusters (D=2.12) in sparsely-planted areas and 5 clusters (D=1.75) in densely-planted areas. The number of Psyllidaes was very large in the densely-planted areas in early spring and in sparsely-planted areas in autumn. It is therefore suggested that investigation during these periods be ntensified and prevention implemented.