不同生境区稻田节肢动物群落相似性分析

根据不同生境区稻田节肢动物群落系统调查结果，应用组平均聚类分析法及主成分分析法，讨论节肢动物群落的相似（相异）性问题。结果表明：生境条件及管理措施的差异对群落的结构影响较为明显，不同生境区的稻田节肢动物群落，都能在一定距离取值时聚合成一类，而水稻品种对此影响较小。主成分分析结果由二维图表达已基本满足要求。结果说明大八镇生境区稻田节肢动物群落与岗列镇生境区稻田节肢动物群落差异较大，分别列于两个极端。海陵镇生境区稻田介于两者之间，而与岗列镇生境区稻田节肢动物群落重叠。与聚类分析结果有所差异。这可能与主成分分析法损失部分信息有关。

The Analysis about the Similarity of Arthropod Communities in Rice Field in Different Habitats

By the data of the arthropod commu jties collected from rice fields in differenthabitats,the similarity of the communities was discussed with the cluster analysis method and prin-cipal component analysis methods,The results showed that the effects of the habitat conditions andthe management strategies during the rice production on the structure and dynamics of the commu-nities were significantly.The communities in the same habitats could been clustered into one groupat relatively short distances.When the distance was equal to 2.2 all of the communities clusteredinto one group.The effects of rice varieties on the communities wzes very limited.The communiti-es from mountain area and the communities from the plain area located in the two sides,thecommunities from the integrated management area located between this two groups and mixedwith the plain communities in the graph showed the results of principal component analysis,thiscoincided with the complex in habitats and the management strategies in the rice field.