The world is experiencing a rapid loss in the biodiversity of pollinator insects. Habitat segmentation caused by infrastructures is one of the contributing factors. To improve the habitat connectivity of pollinator insects, it is proposed in this study to build green corridors for pollinators over linear infrastructures such as highways. In the context of suburban areas of a large city, this study examines differences in air parameters between natural environments and a roadside environment based on monitored and estimated data. Influences of different green corridor designs on floral scent dispersion are also investigated using computational fluid dynamics (CFD) modeling and simulation. It is found that, if flower plants are installed on highway overpasses, the floral scents would be better preserved as compared with those in a natural environment due to the lower concentrations of oxidative radicals in the air above highways. The stronger floral scents and their wider dispersion may help attract pollinators. Conversely, highway air contains a variety of volatine organic compounds (VOCs) that are traced to highway operations and pavements. Hence, the overall profile of VOCs in a highway environment differs from that in a natural environment. Results from CFD modeling and simulation suggest that the use of green corridors planted with flowers on the highway overpass can greatly improve the connectivity of floral scents. Hence, with proper engineering design and right combination of plant species, green corridors built on highway overpasses have the potential to facilitate pollinators to cross the road, thereby improving their habitat connectivity and resilience against declining biodiversity.

中文翻译：

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提高郊区生物多样性恢复力的绿色走廊规划考虑

世界正在经历传粉昆虫生物多样性的迅速丧失。基础设施造成的栖息地分割是促成因素之一。为了改善传粉昆虫的栖息地连通性，本研究建议在高速公路等线性基础设施上为传粉昆虫建造绿色走廊。在大城市郊区的背景下，本研究根据监测和估计的数据检查了自然环境和路边环境之间空气参数的差异。还使用计算流体动力学 (CFD) 建模和模拟研究了不同绿色走廊设计对花香分散的影响。研究发现，如果在高速公路立交桥上安装花卉植物，由于高速公路上方空气中氧化自由基的浓度较低，因此与自然环境中的花香相比，花香会得到更好的保存。更强烈的花香和更广泛的分散可能有助于吸引传粉者。相反，公路空气中含有多种挥发性有机化合物 (VOC)，可追溯到公路运营和路面。因此，公路环境中 VOC 的总体情况与自然环境中的情况不同。CFD 建模和仿真结果表明，在高速公路立交桥上使用种植花卉的绿色走廊可以大大提高花香的连通性。因此，通过适当的工程设计和植物物种的正确组合，