| A systematical investigation on the arthropod community was carried out in four places : Jinshan , Fuzhou; Xibing , Fuan; Anxi and the suburbs of Wuyishan City. By the analysis on principal component and clustering the structure, diversity and seasonal dynamics of arthropod community in the four places were concluded as follows:1. In four different tea plantations there were in total 169 species of arthropods, belonging to 152 genera of 90 families of 18 order of two classes. Among them, 77 species were pests, belonging to 74 genera of 40 families of 9 order of two classes; 8-10 species were neutral insects, belonging to 7 genera of 3 order; 83 species were natural enemies, belonging to 73 genera of 47 families of 11 order of two classes.2.The analysis on the diversity of the community of pests and natural enemies in Fuzhou tea plantation showed that the community indexes about the community of pests and natural enemies had great difference in different periods of a year. From August to November, the richness, diversity index and average index were all higher (S =32.6,H =2.577,E =0.740) , but the dominance index was lower(D = 0.254), which showed that the tea community was abundant and the community was relatively steady; from December to the following March, the diversity index and average index were both the lowest (H =1.986, E =0.5 83), the community was less affected; in April population abundance was not high, but diversity index and average index were relatively higher (H = 2.616, E = 0.736) , the community was relatively steady; from May to July, diversity index and steady index werereduced to a certain extent(H = 1.919, E=0.559), the community was less steady.3. The Seasonal fluctuation of the numbers of insects and natural enemies showed that they are closely related to each other, and the natural enemies could follow the pests to a certain extent.4. The analysis on principal component of the insects and the natural enemies showed that the main pests were mites, smaller green leafhopper Empoasca vitis Gothe and trips; the main predators were spiders, Polyrhachis vicina Roger, ants and Mantidae, and the main parasitoids were other hymenopterous chalcids, Aphelinidae,Scelionidae, Mymaridae.5.The analysis on clustering of the pests and the natural enemies community in Fuzhou showed that the arthropod community in the tea plantation could be divided into six phases, according to optimization division. First, from the mid of October to the end of November, the species and their population were diversified, Species richness and diversity index were higher (S =29, H' =2.247), population dominance was lower (BD =0.253) , and the general index of community was above the average. Second, from the end of November to the beginning of the following March, species richness and the number were lower, diversity index was very low(S =20.09), and the general index of community fluctuated around the average .Third, from the mid of March to the beginning of May, the number of all kinds of species population and species richness began to increase, diversity index was higher (H' =2.120) , and the general index of community were higher than average. Fourth, from the mid of May to the end of June, the increasing number of smaller green leafhopper Empoasca vitis Gothe resulted in the improving of the population dominance, the average and diversity index decreased(H' =1.456), and general index of community was the lowest. Fifth, from the beginningof July to the mid of August, the species richness and the number of most kinds of specieswere low, the diversity index was not high(H' =1.746), and the general index of community was low as well. Sixth, from the mid of August to the end of October, the species richness and the number of species started to increase, so did diversity index(H' =2.292), the general index of community was much higher than the average level, and the population was the most diversified in a year.6. Based on the analysis of diversity indexes in four tea plantations, the tea plantati... |
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