遗传绝对距离差异显著性检验方法

Significance test of difference for genetic absolute distance

G regorius提出的用于比较等位基因差异的遗传绝对距离方法可用来比较两个种群或群落的差异,也可比较两个样地是否来自相同的总体。该方法由于能够给出两个分布的具体差异量而在林分直径分布比较中得到广泛应用。在分析G regorius遗传绝对距离应用于群落结构比较的可能性的基础上,提出了该遗传绝对距离的差异显著判别标准,当两个分布的差异dxy≥dα=dm ax.(1-1/k).-0.2 ln(α/2)时,差异显著。为检验所提出的判别差异显著性方法的有效性,特给出了40个模拟林分的直径分布并用K-S检验进行了验证,结果表明所提出的方法与K-S检验的符合率达100%。研究还指出,遗传绝对距离方法可有效进行群落结构比较,它既可进行直径分布检验也可对物种的相似性做出判定,自然也可以用于等位基因的分析。结合研究提出的差异显著性检验方法,从而使度量结构差异量和判断此差异量显著与否的林分结构分析与比较一体化。

The ＂genetic absolute distance＂, developed by Gregorius, has been used not only in quantifying the difference between allelic distributions, but also in measuring the difference between the diameter distributions or other attributes of two forests. Now it can be used in analyses of the difference between two populations or communities. A critical value of the genetic absolute distance that can determine the significance of the difference between two distributions is developed in this paper. To demonstrate the approach, we have used 40 examples. In this study, we propose that the difference between two distributions is significant if dxy≥dα=dmax·（1-1/k）·√-0.2ln（a/2） , and that the test is comparable to a K-S test. This method may be used to advantage for comparing forest community structures. The Genetic Absolute Distance parameter offers the advantage can be used both for quantifying the difference among populations and for significance testing. It can be used to express the difference in terms that are easy to understand and it can also be used as a test criterion.