The biodiversity conservation value of urban green spaces depends in part on design and management. The importance of habitat quality and complexity to species diversity has led to the suggestion that habitat design elements—varied substrate, greater plant diversity, logs or stones—would support invertebrate diversity on green roofs. To evaluate this possibility, we conducted pit-fall trap sampling on three green roofs of simple design (intended primarily for stormwater management), three habitat roofs, and five ground-level green spaces, in the Portland, Oregon metropolitan area. Beetles (Coleoptera) were sampled as representatives of total invertebrate diversity. Diversity was compared using sample coverage and Hill numbers to account for differences in sample intensity and fundamental differences in species diversity. Both habitat roofs and ground sites consisted of just over 20% native species, while stormwater roofs had about 5% native species, all of which were considered pests. We collected a greater abundance of beetles on the ground compared to roof sites like others have shown. However, when sample completeness is taken into account, habitat roofs had greater Shannon diversity compared to both ground and stormwater roof sites. Habitat roofs had the fewest dominant species representing 5% or more of total abundance, but also the lowest percent of species represented by singletons (27%). These results indicate that green roofs can support different beetle communities compared to those present at ground-level urban green spaces; our results also support previous findings that biodiverse design can reliably increase green roof diversity compared to more simply designed roofs.

城市绿地的生物多样性保护价值部分取决于设计和管理。栖息地质量和复杂性对物种多样性的重要性导致了栖息地设计元素——不同的基质、更大的植物多样性、原木或石头——将支持绿色屋顶上的无脊椎动物多样性的建议。为了评估这种可能性，我们在俄勒冈州波特兰市区的三个设计简单的绿色屋顶（主要用于雨水管理）、三个栖息地屋顶和五个地面绿色空间进行了陷阱采样。甲虫（鞘翅目）被取样作为总无脊椎动物多样性的代表。使用样本覆盖率和希尔数来比较多样性，以说明样本强度的差异和物种多样性的根本差异。栖息地屋顶和地面场地都由略高于 20% 的本地物种组成，而雨水屋顶则有大约 5% 的本地物种，所有这些都被认为是害虫。与其他人所展示的屋顶站点相比，我们在地面上收集了更多的甲虫。然而，当考虑到样本完整性时，与地面和雨水屋顶场地相比，栖息地屋顶具有更大的香农多样性。栖息地屋顶的优势物种最少，占总丰度的 5% 或更多，但单身物种代表的物种百分比最低 (27%)。这些结果表明，与地面城市绿地相比，绿色屋顶可以支持不同的甲虫群落；