School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, China.
School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, China; Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China E-mail:
Water Sci Technol. 2024 Apr;89(8):1946-1960. doi: 10.2166/wst.2024.111. Epub 2024 Apr 5.
The bioretention system is one of the most widely used low impact development (LID) facilities with efficient purification capacity for stormwater, and its planting design has been a hot spot for research at home and abroad. In this paper, ryegrass ( L.), bermuda ( Linn.), bahiagrass (), and green grass ( × ) were chosen as plant species to construct a shallow bioretention system. The growth traits and nutrient absorption ability of four gramineous plants were analyzed. Their tolerance, enrichment, and transportation capacity were also evaluated to compare plant species and their absorptive capacity of heavy metals (Cu, Pb, and Zn). Results showed that the maximum absorption rate () ranged from 22.1 to 42.4 μg/(g·h) for P and ranged from 65.4 to 104.8 μg/(g·h) for NH-N; ryegrass had the strongest absorption capacity for heavy metals and the maximum removal rates of Cu, Pb, and Zn by four grasses were 78.4, 59.4, and 51.3%, respectively; the bioretention cell with ryegrass (3#) was significantly more effective in purifying than the unplanted bioretention cell (1#) during the simulated rainfall test. Overall, the system parameters were optimized to improve the technical application of gramineous plants in the bioretention system.
生物滞留系统是最广泛使用的低影响开发 (LID) 设施之一，对雨水具有高效的净化能力，其种植设计一直是国内外研究的热点。本文选择黑麦草（Lolium perenne）、百喜草（Paspalum notatum）、狗牙根（Cynodon dactylon）和杂交狼尾草（Pennisetum alopecuroides × Pennisetum americanum）作为植物物种，构建浅型生物滞留系统。分析了四种禾本科植物的生长特性和养分吸收能力。还评估了它们的耐受性、富集性和运输能力，以比较植物物种及其对重金属（Cu、Pb 和 Zn）的吸收能力。结果表明，P 的最大吸收速率（Qmax）范围为 22.1 至 42.4μg/（g·h），NH4+-N 的 Qmax 范围为 65.4 至 104.8μg/（g·h）；黑麦草对重金属的吸收能力最强，四种草对 Cu、Pb 和 Zn 的最大去除率分别为 78.4%、59.4%和 51.3%；在模拟降雨试验中，种植黑麦草（3#）的生物滞留单元比未种植的生物滞留单元（1#）在净化方面更有效。总体而言，优化了系统参数，以提高禾本科植物在生物滞留系统中的技术应用。
