title: [Study on the linkage between urban built-up land and water quality in the Jiulong River watershed].
abstract: Band grouping indices combined with single band characteristic were used to extract urban built-up land based on satellite image in the Jiulong River Watershed. Landscape ecology method and statistical analysis were employed to explore the relationship between urban built-up land and permanganate index, NH4(+) -N, TP concentrations. There were significantly positive correlations between the proportion of urban built-up land and permanganate index, NH4(+) -N, TP (r = 0.701, 0.695, 0.789). It indicates the proportion of urban built-up land areas in the sub-watershed could be an effective indicator of water quality. The largest patch index (LPI) was positively correlated to permanganate index, NH4(+) -N, TP concentrations in the water (r = 0.555, 0.643, 0.722). The landscape shape index(LSI) was positively correlated to permanganate index and TP concentrations in the water (r = 0.564, 0.553). These means the impacts of urban built-up land on water quality are influenced not only by urban built-up land areas but also by spatial patterns. The seasonally linear correlation results show that water quality deteriorates quickly with urban built-up land during the flood season and dry season, and the water is susceptible to eutrophication in both flood and dry seasons. The water quality in most sub-watersheds are impacted by urban built-up land, while the urban built-up land areas of Longmen stream, Su stream and Xiao stream located in headstreams are intensive, which need to be adjusted and controlled to protect the water quality.
authors.affiliation: Environmental Science Research Center, Xiamen University, Xiamen 361005, China. qqsun@xmu.edu.cn
authors.forename: Qin-Qin
authors.initials: QQ
authors.lastname: Sun
authors.forename: Jin-Liang
authors.initials: JL
authors.lastname: Huang
authors.forename: Hua-Sheng
authors.initials: HS
authors.lastname: Hong
authors.forename: Yuan
authors.initials: Y
authors.lastname: Feng
mesh_terms: D002681:China; D002947:Cities; D004784:Environmental Monitoring; D005068:Eutrophication; D005160:Facility Design and Construction; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen