由于城市绿地和集水区有限,研究人员正在探索垂直绿化系统(VGSs)在雨水管理中的能力,作为补充策略。虽然文献承认植被屋顶基底对雨水的重大影响,比较VGSs的有机和非有机底物的雨水管理能力仍未探索。因此,收集经验证据以提高VGSs的雨水管理能力至关重要。这里,我们报告了创新VGS的安装因素(底物类型和植物生长促进微生物(PGPM)接种)和环境因素(模拟雨水量和底物水分)对15个元素(N,P,Al,V,Cr,Fe,Mn,Co,Ni,Cu,Zn,As,Se,Cd,和Pb)在径流中。结果表明,底物类型是最有影响的因素:具有高有机质的芦苇基底物的浓度和总负荷明显高于砂壤土底物。基质类型与其他因素也有深刻的交互作用。例如,PGPM接种显着降低了As的总负荷,Cr,N,Ni,Se,无论基板类型,减少了Cd的总负荷,Co,Cu,Fe,Mn,和Pb仅在簧片基衬底中。此外,PGPM接种主要减少总负荷,但对浓度影响不大。基材类型也与模拟雨水量和基材水分相互作用:例如,在基于芦苇的基质中,较高的模拟雨水量降低了浓度,但增加了总负荷,而在各种模拟雨水量下,砂壤土基质的浓度和总负荷一直保持较低。较高的前期基质水分增加了大多数元素的浓度和总负荷。我们得出的结论是,可以通过底物选择来包含从VGSs中的浸出,保持基质水分,和有益的PGPM接种。
Due to limited urban green spaces and catchments, researchers are exploring the capacity of vertical greenery systems (VGSs) in stormwater management as complementary strategies. While the literature acknowledges the significant impacts of vegetated roof substrates on stormwater, comparing the stormwater management capacities of organic and non-organic substrates for VGSs remains largely unexplored. It is thus essential to gather empirical evidence to enhance the stormwater management capacity of VGSs. Here, we report on the impact of installation factors (substrate type and plant growth-promoting microbe (PGPM) inoculation) and environmental factors (simulated rainwater quantity and substrate moisture) of an innovative VGS on the concentrations and total loads of 15 elements (N, P, Al, V, Cr, Fe, Mn, Co, Ni, Cu, Zn, As, Se, Cd, and Pb) in the runoff. Results showed that substrate type was the most influential factor: concentrations and total loads were significantly higher from a reed-based substrate with high organic matter than from a sandy loam substrate. Substrate type also had profound interactive effects with other factors. For instance, PGPM inoculation significantly reduced the total loads of As, Cr, N, Ni, and Se, regardless of substrate type, and reduced the total loads of Cd, Co, Cu, Fe, Mn, and Pb in the reed-based substrate only. In addition, PGPM inoculation primarily reduced total loads, yet had little effect on concentrations. Substrate type also interacted with simulated rainwater quantity and substrate moisture: for example, in the reed-based substrate, a higher simulated rainwater quantity reduced concentrations but increased total loads, while concentrations and total loads remained constantly low from the sandy loam substrate under various simulated rainwater quantities. High antecedent substrate moisture increased both concentrations and total loads for most of the elements. We conclude that leaching from VGSs can be contained via substrate selection, maintenance of substrate moisture, and beneficial PGPM inoculation.