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To analyze quantitative dynamics of adult population and 3-D spatial pattern of Ceoporus variabilis(Baly),from March 26 to September 24,2006,we investigated the adult population occurrence of Ceoporus variabilis(Baly) in the Redleaf Cherry Plum trees in the "Apricot Blossom" Park of Hefei city(117°12′ E,31°52′ N).The results showed that Ceoporus variabilis(Baly) was firstly seen on May 21,the high peak period of their occurrence was from June 4 to July 16,and only scattered adult numbers appeared in early September.The population growth model of Ceoporus variabilis(Baly) was y=1692.2258e-0.0545t between June 4 and September 10.Similarly,the population growth model of Ceoporus variabilis(Baly) in the top part and the western part of the tree crown was y=205.60e-0.0523t and y=257.13e-0.0505t,respectively,between May 4 and July 27.These results indicate that the adult numbers of Ceoporus variabilis(Baly) in both horizontal and vertical direction all presented exponential decline form after the high peak period of their occurrence.The geostatistics analysis showed that the semivariable function equation of space distribution of Ceoporus variabilis(Baly) in May 21,June 4,June 18,July 2,July 16,July 30 and August 13,respectively,was y = 2E-05x3-0.024x2 + 0.0727x+0.142,y = 0.0709x3-10.479x2+391.67x-300.71,y =-0.0122x3 + 1.1201x2-19.781x + 317.84,y =-0.0013x3 + 0.1613x2-4.4862x + 67.363,y =-0.0016x3 + 0.9177x2-11.495x+551.94,y =-0.0029x3 + 0.3034x2-7.5906x +103.37 and y =-0.0002x3+0.0172x2-0.4975x+13.691.The range of spatial dependence of adult population of Ceoporus variabilis(Baly) in the seven periods was from 20.3938 to 65.0289.The above results revealed that the spatial pattern of adult population of Ceoporus variabilis(Baly) was aggregated distribution from May 21 to August 13.Moreover,our results demonstrated that aggregation indices of horizontal distribution pattern of Ceoporus variabilis(Baly) in the eastern,western,northern and southern part of the tree crown,respectively,have C value1,I value0,CA value0 and Iw value1,indicating that the spatial pattern of their horizontal distribution was aggregated pattern from May 21 to August 13.Consistently,the spatial pattern of their vertical distribution in upper,middle and lower part of the tree crown,respectively,was aggregated pattern with all C1,I0,CA0 and Iw1 from June 4 to August 13.The further analysis indicated that the spatial pattern in the eastern,western,northern,southern,upper,middle and lower part of the tree crown,respectively,presented also aggregated pattern with all C1,I0,CA0 and Iw1 from May 21 to August 13.In addition,our results showed that the λ values of Ceoporus variabilis from June 4 to August 13 were all more than 2,implying that their aggregation behaviors were caused by theirself features. |
