Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Sci Total Environ. 2023 Feb 1;858(Pt 3):160088. doi: 10.1016/j.scitotenv.2022.160088. Epub 2022 Nov 9.
Urban green infrastructure has been simulated effectively and economically to reduce volume and pollutants of stormwater runoffs but its spatial effects remain unclear. A snap sampling campaign was carried out for surface water quality in the downtown waterway network of a pilot sponge city (Suzhou) in China, dividing into 7 subwatersheds according to the digital elevation map. In total, 144 sampling points were investigated and measured for chemical quality of surface water while 68 out of the sampling points had a sensory evaluation questionnaire interview for water quality with 321 respondents, in whom the native residents scored a significant spatiality of water quality. The downtown waterway network had phosphorus-limited eutrophic surface water with total nitrogen worse than Class V of the national guidelines. Chemical and sensory evaluation indexes of surface water quality had significant spatial consistency (p < 0.001). All types of green spaces (%) in subwatershed, especially along the urban waterway network (waterfront) and roadside, and in the 100 m riparian buffer zone, significantly influenced nutrient loads in surface water. Findings of the present study suggest that the 100 m riparian buffer zone would be priority areas and the waterfront and roadside should be the highly efficient spots for planning strategy on urban green infrastructure implementation to reduce nutrient loads in surface water and to improve urban landscape aesthetics.
城市绿色基础设施在有效且经济地减少雨水径流水量和污染物方面已得到充分模拟，但它的空间效应仍不清楚。在中国一个海绵城市试点（苏州）的市区航道网络中，进行了一次地表水水质的突击采样活动，根据数字高程图将其分为 7 个小流域。总共调查和测量了 144 个地表水化学质量采样点，其中 68 个采样点进行了水质感官评价问卷调查，共有 321 名受访者，其中本地居民对水质的评分具有显著的空间性。市区航道网络的富营养化地表水呈磷限制型，总氮劣于国家指南的 V 类。地表水水质的化学和感官评价指标具有显著的空间一致性（p<0.001）。小流域内的所有类型的绿色空间（%），特别是沿市区航道网络（滨水）和路边，以及 100 米河岸缓冲带，对地表水中的养分负荷有显著影响。本研究的结果表明，100 米河岸缓冲带将是优先区域，滨水带和路边应成为规划城市绿色基础设施实施策略的高效区域，以减少地表水中的养分负荷并改善城市景观美学。
