Sun Qin-Qin, Huang Jin-Liang, Hong Hua-Sheng, Feng Yuan
Environmental Science Research Center, Xiamen University, Xiamen 361005, China.
Huan Jing Ke Xue. 2011 Oct;32(10):2849-54.
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.
结合单波段特征的波段分组指数被用于基于九龙江流域卫星影像提取城市建设用地。采用景观生态学方法和统计分析来探究城市建设用地与高锰酸盐指数、铵态氮、总磷浓度之间的关系。城市建设用地比例与高锰酸盐指数、铵态氮、总磷之间存在显著正相关（r = 0.701、0.695、0.789）。这表明子流域内城市建设用地面积比例可能是水质的有效指标。最大斑块指数（LPI）与水中高锰酸盐指数、铵态氮、总磷浓度呈正相关（r = 0.555、0.643、0.722）。景观形状指数（LSI）与水中高锰酸盐指数和总磷浓度呈正相关（r = 0.564、0.553）。这意味着城市建设用地对水质的影响不仅受城市建设用地面积的影响，还受空间格局的影响。季节性线性相关结果表明，在汛期和枯水期，水质随城市建设用地的增加而迅速恶化，且在汛期和枯水期水体均易发生富营养化。大多数子流域的水质受到城市建设用地的影响，而位于源头的龙门溪、苏溪和小溪的城市建设用地面积较大，需要进行调整和控制以保护水质。
