Non-point-source impacts on stream nutrient concentrations along a forest to urban gradient
Non-point-source impacts on stream nutrient concentrations along a forest to urban gradient
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DOI：
10.1007/s00267-003-0311-z
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发表时间：
2005-03-01
影响因子：
3.5
通讯作者：
Funke, DE
中科院分区：
文献类型：
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作者：
Brett, MT;Arhonditsis, GB;Funke, DE
我们对大西雅图地区17条溪流的10年河流营养盐和沉积物浓度记录进行了统计分析，以确定城市非点源污染物对溪流水质的影响。这些流域以城市(22-87%)或森林(6-73%)土地覆盖为主，没有主要的营养点来源，溪水磷浓度与流域土地覆盖类型呈中等强相关(r(2)=0.58)，而氮浓度则弱相关(R2=0.19)和不显著相关(α和lt)；与土地覆盖相关，大多数城市河流的总磷(TP)、可溶性活性磷(SRP)和浊度平均比森林覆盖的河流高95%和122%，浊度高71%，硝酸盐(NO3)、氨氮(NH4)和总悬浮固体(TSS)浓度与土地覆盖没有显著差异，这些结果表明，城市化显著提高了河流磷浓度，并适度增加了氮浓度。然而，西雅图地区城市溪流中的营养物质浓度明显低于之前报道的农业区溪流。
We conducted statistical analyses of a 10-year record of stream nutrient and sediment concentrations for 17 streams in the greater Seattle region to determine the impact of urban non-point-source pollutants on stream water quality. These catchments are dominated by either urban (22-87%) or forest (6-73%) land cover, with no major nutrient point sources, Stream water phosphorus concentrations were moderately strongly (r(2) = 0,58) correlated with catchment land-cover type, whereas nitrogen concentrations were weakly (r2 = 0,19) and nonsignificantly (at alpha < 0.05) correlated with land cover, The most urban streams had, on average, 95% higher total phosphorus (TP) and 122% higher soluble reactive phosphorus (SRP) and 71% higher turbidity than the most forested streams, Nitrate (NO3), ammonium (NH4), and total suspended solids (TSS) concentrations did not vary significantly with land cover, These results suggest that urbanization markedly increased stream phosphorus concentrations and modestly increased nitrogen concentrations. However, nutrient concentrations in Seattle region urban streams are significantly less than those previously reported for agricultural area streams.