| The bamboo forest of Phyllostachys heterocycla cv. pubescens is one of the most important natural resources in South China, which play a significant role in the construct of the forest's ecological environment and in the increase of national income for its high output, broad plant area and wide uses. In recent years, the incessant outbreaks of many kinds of pests on bamboo leaves in South China, including harmful mites, Pantana phyllostachysae and Kuwanaspis vermiformis etc., have turned into the vast obstacles of the development of the forest's ecological, economical and social benefits, so the sustainable control of these pests has been become more and more important and imminent. In the view of the present situation, the arthropod groups and the pest populations in different kinds of bamboo forests under the different management disturbances, pest control disturbances, habitats, climate and growth status of bamboo, were studied by means of the large amount of field investigation in Zongcun, Sanming and Qiujiang, Saxian, Fujian, China from 2001 to 2002, which aimed to evaluate the groups' diversity and stability, and reveal the outbreak mechanisms of these pests and then put forward the strategies of pest sustainable control. The arthropod group in bamboo forest was compartmentalized into the underlayer arthropod group and the canopy arthropod group according to the characteristics of bamboo forest's layers, and all species in groups were classified into phytophagous, predatory, parasitic, spider and neutral functional groups according to their feeding characteristics. The main research results were as follows:1. There were 97,176 samples collected through the systematic investigation of arthropod group from September 2001 to August 2002 in 25 standard bamboo forest sites of Phyllostachys heterocycla cv. pubescens at Zhongcun, Sanming and Qiujiang, Saxian, Fujian, China, which included 84,352 samples collected from the bamboo canopy belonging to 3 classes, 21 orders, 124 families and,332 species, and 12,824 samples from the underlayer of bamboo forest belonging to 3 classes, 22 orders, 130 families and 349 species. The distribution characteristics of order, family and species between these 2 groups were very similar, but of the individual number there existed significant differences, in which the percentages of harmful organisms and natural enemies in the canopy arthropod group were 78.83% and 17.08% respectively, but were 26.36% and 48.36% respectively in the underlayer arthropod group, and the diversity of the underlayer arthropod group was much more than that in the canopy arthropod group. Using the optimal sorting, the temporary pattern of the canopy group in the year period was divided into 4 stages of September to October, November, December to July next year and August, and 4stages of September to November, December to February next year, May and April to August for the underlayer group. There were 219 common species in these two groups, including 38 species of neutral group, 82 species of phytophagous group, 51 species of spider group, 37 species of predatory group and 11 species of parasitic group. The test of community similarity showed the high similarity of species constituent between the canopy group and the underlayer group, the individual transfer each other between 2 groups, and the canopy arthropod group played an important role of species storeroom in the reconstruction of the underlayer arthropod group. The correlation analysis showed a significantly positive relativity of the individual number of natural enemies and the promotion of species diversity in the relationship between 2 groups.2. Through the systematic investigation on the underlayer plant group in bamboo forests under different manual management disturbances such as hoeing + fertilizing, hoeing, weed hewing, herbicide spraying and none-management, the results indicated that there were 36 families and 84 species plants in the shrub layer, 15 families and 28 species in the liana layer, 26 families and 31 species in the...
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