College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China.
Water Sci Technol. 2012;66(10):2138-45. doi: 10.2166/wst.2012.424.
The present study was carried out to investigate the growth characteristics of different ryegrass (Lolium perenne L.) cultivars and their ability to remediate eutrophic water using floating plant-bed technology. Greenhouse and lake experiments were conducted to evaluate the grass genotypes for water remediation. Twelve cultivars of ryegrass including Grazer, Secale Cerale, Energa, Rustmaster, AngusI, Abundant, AngusII, Jivet, Gulf, Surrey, Major and Barwoltra were grown in the floating plant-bed system. The plant biomass, plant NP (nitrogen and phosphorus) accumulations and the water purification capacity of selected grasses were significantly different (P < 0.05). Abundant, AngusII and Major showed most efficient purification capacity of eutrophic water. In a greenhouse, after 26 days of growth, the eutrophic water was purified to various extents by the different ryegrass cultivars. Nitrogen removal efficiency varied from 52.20% to 73.82% and phosphorus removal efficiency ranged from 75.12% to 84.77%. In a lake experiment at Huajiachi pond, after 162 days of growth, the plant shoot biomass increased from 321.5 to 922.8 g/m(2) dry weight basis, shoot NP accumulation ranged from 61.5 to 168.2 mg m(-2) d(-1) and 11.9 to 47.2 mg m(-2) d(-1) respectively. NP accumulation rate by the various cultivars of ryegrass was highly positively correlated to their biomass production and water purification capacity. Thus, plant biomass could be used as an indicator for assessing purification capacity of a ryegrass cultivar.
本研究采用浮床技术，研究了不同黑麦草（Lolium perenne L.）品种的生长特性及其对富营养化水的修复能力。通过温室和湖泊实验对草基因型进行了水修复评价。在浮床系统中种植了 12 个黑麦草品种，包括 Grazer、Secale Cerale、Energa、Rustmaster、AngusI、Abundant、AngusII、Jivet、Gulf、Surrey、Major 和 Barwoltra。所选草的植物生物量、植物 NP（氮和磷）积累和水净化能力差异显著（P < 0.05）。Abundant、AngusII 和 Major 表现出对富营养化水最有效的净化能力。在温室中，经过 26 天的生长，不同黑麦草品种对富营养化水进行了不同程度的净化。氮去除效率从 52.20%到 73.82%不等，磷去除效率从 75.12%到 84.77%不等。在华家池湖泊实验中，经过 162 天的生长，植物地上生物量从 321.5 增加到 922.8 g/m(2)干重，地上 NP 积累量从 61.5 增加到 168.2 mg m(-2) d(-1)和 11.9 到 47.2 mg m(-2) d(-1)。不同黑麦草品种的 NP 积累率与生物量生产和水净化能力呈高度正相关。因此，植物生物量可以作为评价黑麦草品种净化能力的指标。
