光肩星天牛幼虫空间分布型的研究

Studies in the Spatial Pattern of Anoplophra glbripennis Lararvae

本文采用扩散系数Ｃ法、扩散指数Ｉ０法、Ｃａｓｓｉｃ指标ＣＡ法，种群群集均数入法，Ｔａｙｌｏ指数ｂ法和Ｉｗａｏ的平均拥挤度ｍ与平均数ｘ的回归分析法，测定了杨树上光肩星天牛幼虫的空间分布属于聚集分布，符合负二项分布模型。同时探讨了空间分布型在序贯抽样中的应用。行道树和防护林中理论取样数（Ｎ）与单株虫口平均密度（ｘ－）的关系分别为：Ｎ＝８．００利用有虫株率（Ｐ）简易估计虫口密度的关系式分别为：ｘ＝７．２６２０［－／ｎ（１一Ｐ）］￣０．６００３和ｘ＝３．６９２５［－１ｎ（１－Ｐ）］￣．３９１０１。

Using index of patchiness C.1.CA.γ coefficient b in Taylors and re-gression analysis method of lwaos between mean Crowing(m)and mean(X),we de-ternined the spatial distribution pattern of Anoplaophra glabripennis larvae on poplars.It bdongs to a11 aggregated distribution in accordance with the negative binomial distr-bution model.We also inquired into its application in the sequential sattlpiing. In the ling-tree and shelter-forest,the relationship between the theoretical sampling number(N)and mean single-plant population density(X)is N=8.00+15.54/Xand N=19.78+31.29/ Xrespectively.by counting the percentage of the plant with larvae(P),therelation formula of simply estimating population density(X)are X=7.262。[-In(1-p)]0.5003 and X=3.6925[-1n(1-)]1.3910