华山松大小蠹空间格局及最佳模型的研究

A Study on Spacial Distribution Pattern and the Best Model of Dendroctonus armandi L i Kairen1 )

通过频次比较 χ2 检验法 ,对华山松大小蠹入侵成虫 (凝脂数 )分别进行 Poisson分布 ,负二项分布 (矩法、零频率法 )和 Neyman分布 (A型、C型、N→∞型 )检验 ,当虫株率小于 48%时 ,呈负二项分布。将 1 3种聚集度指标法及新的聚集度指标群用于该虫的空间分布研究中 ,认为均是可行的。并将刀切估计法应用于 1 3种聚集度指标上 ;拟合出了 7种空间最佳模型 ;总地来说 ,聚集度回归模型在研究昆虫空间分布格局中是最佳的方法。华山松大小蠹入侵成虫种群聚集临界密度为 0 .0 0 76头 /株 。

Spacial distribution of adults of invading of Dendroctonus armandi appears crowd- ing pattern when the percentage of discrimination is below48% tested by three means of dis- tinction,i.e.,Poisson distribution,Neyman distribution(Neyman A,Neyman C and Neyman n→∞ ) and negative binomial distribution.It is practicable to use 1 3examining means of crowding level and new groups of crowding level in the study of spacial distribution.Seven best regression models were gotwhen the Jack knifing method was used in those levels.Gen- erally,crowding regression models are the best ones to study the spacial distribution of in- sects.The critical desity of the adults of invading D.armandi is0 .0 0 76 head/plant,and the spacial distribution pattern is an adverse density restriction type of crowding levels.