高速公路边界属性对防护林区昆虫多样性的影响

The effect of marginal attributes on insect diversity of the marginalprotection forest along expressway

调查了高速公路不同边界类型和护坡道荆条种植区内昆虫群落的种类组成及数量变化,利用主成分分析和聚类方法分析了高速公路不同边界类型的属性与边界内生物多样性的关系。结果表明,护坡道荆条种植区内的昆虫群落多样性都比3种类型边界防护林内的高。主成分和聚类分析表明,边界上的昆虫群落多样性与物种数、年蜘蛛数量及其标准差、植被的盖度几个指标呈正相关,与边界宽度呈负相关;各边界类型都反映了昆虫、植被盖度和边界的结构等方面构成的综合特征,而非单一指标的简单组合。

The variation of species and individual numbers of the insect communities in different margins types and Vitex negundo were investigated along expressway. The principal component analysis and clustering analysis were used to study the relationship of between biodiversity and marginal attributes along expressway. The results showed that the insect communities in Vitex negundo had higher diversity than three types of road margin. The results of the principal component analysis and clustering analysis showed that there was a positive correlation among the insect communities diversity and species, the numbers of spider, the standard deviation of spider numbers and the cover of vegetation in different margins types. The relationship between the insect communities diversity and the marginal breadth was a negative correlation. The different types of margins along expressway reflected the integrative characteristic that composing of the insect and the vegetational cover and the marginal structure. It was not a sigle index combination.