Berndtsson Justyna Czemiel, Emilsson Tobias, Bengtsson Lars
University of Lund, Department of Water Resources Engineering, Box 118, S-221 00 Lund, Sweden.
Sci Total Environ. 2006 Feb 15;355(1-3):48-63. doi: 10.1016/j.scitotenv.2005.02.035. Epub 2005 Apr 15.
The influence of extensive sedum-moss vegetated roofs on runoff water quality was studied for four full scale installations located in southern Sweden. The aim of the study was to ascertain whether the vegetated roof behaves as a sink or a source of pollutants and whether the age of a vegetated roof influences runoff quality. The runoff quality from vegetated roofs was also compared with the runoff quality from non-vegetated roofs located in study areas. The following metals and nutrients were investigated: Cd, Cr, Cu, Fe, K, Mn, Pb, Zn, NO3-N, NH4-N, Tot-N, PO4-P, and Tot-P. The results show that, with the exception of nitrogen, vegetated roofs behave as source of contaminants. While in lower concentrations than normally found in urban runoff, some metals appear in concentrations that would correspond to moderately polluted natural water. Nitrate nitrogen is retained by the vegetation or soil or both. Apart from the oldest, the studied vegetated roofs contribute phosphate phosphorus to the runoff. The maintenance of the vegetation systems on the roofs has to be carefully designed in order to avoid storm-water contamination; for instance, the use of easily dissolvable fertilizers should be avoided.
对瑞典南部四个全尺寸装置的大面积景天苔藓植被屋顶对径流水质的影响进行了研究。该研究的目的是确定植被屋顶是污染物的汇还是源,以及植被屋顶的使用年限是否会影响径流质量。还将植被屋顶的径流质量与研究区域内非植被屋顶的径流质量进行了比较。对以下金属和养分进行了调查:镉、铬、铜、铁、钾、锰、铅、锌、硝酸氮、铵氮、总氮、磷酸磷和总磷。结果表明,除氮以外,植被屋顶是污染物的来源。虽然某些金属的浓度低于城市径流中通常发现的浓度,但仍有一些金属的浓度与中度污染的天然水相当。硝酸盐氮被植被或土壤或两者保留。除了最老的植被屋顶外,所研究的植被屋顶会向径流中排放磷酸磷。必须精心设计屋顶植被系统的维护措施,以避免雨水污染;例如,应避免使用易溶解的肥料。