中文摘要：

传粉昆虫在显花植物起源和演化的早期起着决定性的作用（任东等,1998）,对现存有花植物的生存、繁衍也具有重要的作用。在显花植物中,大约有85%的物种属于虫媒传粉,利用传粉昆虫可显著地提高作物的产量。花通过提供花粉、花蜜等酬报以及休息、狩猎、觅偶交配和取暖的场所吸引访花昆虫访花,而昆虫在访花过程中或多或少地携带了花粉,触动了柱头,对所访的花产生授粉作用（钦俊德,1987）。

英文摘要：

With Pajek,a program for analysis and visualization of large networks,topologies of plant-insect pollinator interaction networks were constructed at the different taxa levels,and the change in patterns of interaction networks was studied.The results showed that patterns were different at the different taxa levels.The frequency distributions of species degree for insect pollinators and flowering plants were right-skewed at the species level.The insect pollinators and flowering plants with more than 1 links accounted for high proportion,with only a few species higher links,and the mean species degree for plants was higher than that of insect pollinator in plant-insect pollinator interaction networks in subalpine meadows.There was obvious lack of super generalized species indicating that phenological or morphologic mismatching between plant and insect pollinator forbad links between them.The frequency distributions of species degree for insect pollinators at the order level were different from that at the species level,however,generalized insect orders were also dominant.It is thus clear that studies on network patterns at the different levels would contribute to uncovering organization mechanism of pollination networks,and understanding that conservation on keystone insect pollinators or flowering plants with higher links is vital to maintain pollination system in subalpine meadows in Changbai Mountain.