Li Li-Qing, Liu Yu-Qing, Yang Jia-Min, Wang Juan
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China.
Huan Jing Ke Xue. 2018 Jul 8;39(7):3150-3157. doi: 10.13227/j.hjkx.201711252.
The role of vegetation and saturated zones in stormwater-dissolved phosphorus (PO-P) removal was investigated using bioretention microcosms. Nine bioretention columns were dosed with synthetic stormwater under various hydrological conditions and phosphorus loading rates and monitored over a 12-month period. Remarkable phosphorus removal (>90%) was achieved using the mixed filter media of sand and local soil, with or without vegetation. Bioretention columns in which was planted could significantly enhance PO-P removal. The saturated zones could also reduce the effluent PO-P concentrations, but had no significant effect on total phosphorus removal. Approximately 50% of the input phosphorus retained in the filter media was extracted in the top 0-22.5 cm, where it could be available for uptake by plants. Further, 57.1% to 76.1% of the total phosphorus input recovered in the total plant biomass was stored in the above-ground shoots. Thus, periodic harvesting of shoots can be a sustainable method of phosphorus removal from stormwater bioretention systems.
利用生物滞留微观模型研究了植被和饱和带在去除雨水溶解磷（PO-P）中的作用。九个生物滞留柱在不同水文条件和磷负荷率下投加合成雨水，并在12个月内进行监测。使用沙子和当地土壤的混合过滤介质，无论有无植被，都能实现显著的磷去除（>90%）。种植了植被的生物滞留柱能够显著提高PO-P的去除率。饱和带也能降低出水PO-P浓度，但对总磷去除没有显著影响。过滤介质中保留的约50%的输入磷在顶部0-22.5厘米处被提取出来，植物可以吸收利用。此外，在植物总生物量中回收的总磷输入量的57.1%至76.1%储存在地上枝条中。因此，定期收割枝条可以成为从雨水生物滞留系统中去除磷的可持续方法。
