大豆蚜种群的空间结构参数特征及其应用

SPATIAL DISTRIBUTION AND SAMPLING TECHNIQUE OF APHIS GLYCINES MATSUMURA

对大豆蚜的空间分布型进行了研究。１１组样本中有１０组符合负二项分布，１组属聚集分布，所有样本均不符合泊松、奈曼（ｎ＝０～４和ｎ＝∞）、泊松二项、复合泊松分布。大豆蚜空间分布基本成分为个体群的聚集分布，聚集程度随密度的增加而提高。利用大豆蚜种群的空间格局参数ｍ、ＣＡ、Ｉδ、ｍｘ、α、β和种群聚集均数λ值，分析了大豆蚜种群聚集的原因，估计了个体群平均大小及其与平均密度的关系。通过Ｔａｙ－ｌｏｒ的指数回归式参数确定了在一定精确度水平下的理论抽样数和序贯抽样公式：理论抽样数ｎ＝５．３６４１ｘ－０．６４Ｄ２，序贯抽样截止线Ｔｎ＝１３．８Ｄ３．１２５·ｎ０．５６３。

The spatial distribution of Aphis glycines was studied. All sets of samples exhibited aggregated patterns of spatial distribution, but not fitted Poission, Neymann( n =0￣4 and ∞), Poission binomial and compound Poission distributions. Of 11 sets of samples tested, 10 sets fitted the negative binomial distribution, only 1 set not fitted. The spatial distribution parameters ( 、 C A、 I δ、 、 α、 β) of the soybean aphids were analyzed, and the reason of contagious patterns of the aphids was discussed. The sample size requirements and sequential sampling plans of fixed levels with precision were determined by utilizing estimated variance/mean relationship obtained from Taylor′s power law regression.