Enhancing river water quality in different seasons through management of landscape patterns at various spatial scales

被引:0
作者
Gu, Yang [1 ,2 ,3 ]
Zhang, Pingjiu [3 ]
Qin, Fengyue [1 ,2 ]
Cai, Yongjiu [1 ,2 ]
Li, Cai [1 ,2 ]
Wang, Xiaolong [1 ,2 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Lake & Watershed Sci Water Secur, Nanjing 210008, Peoples R China
[2] Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China
[3] Anhui Normal Univ, Sch Geog & Tourism, Key Lab Earth Surface Proc & Reg Response Yangtze, Wuhu 241002, Peoples R China
基金
中国国家自然科学基金;
关键词
Water quality index; Landscape metric; Multiple scales; Redundancy analysis; Abrupt threshold analysis; LAND-USE; SURFACE; POLLUTION;
D O I
10.1016/j.jenvman.2024.123653
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Landscape patterns have a great effect on river water quality. However, the strategies for enhancing water quality through landscape pattern management remain unclear. In this study, we aimed to provide effective guidance for water quality management by quantifying the key spatial scales and landscape metrics that influence the seasonal variations in water quality and establishing threshold relationships between these metrics and abrupt variations in water quality in the Chaohu Lake basin, China. Results discovered that water quality was poorer in summer and better in spring, with degraded water conditions primarily concentrated in the middle and lower reaches of the watershed. The 100 m riparian zone buffer scale landscape pattern was identified as the key scale affecting water quality in the summer, which accounted for 51.3% of the overall water quality variation. Furthermore, abrupt threshold analysis indicated that summer water quality could be effectively improved by maintaining the proportion and largest patch index of construction land within the 100 m riparian buffer below 22.0%. At the sub-basin scale, landscape pattern-based water quality management was most effective in spring, explaining 43.6% of the variation in water quality. Setting the largest patch index of construction land at the subbasin scale below 43.0% and increasing the proportion of forest cover above 36.0% can also alleviate water pollution issues. These findings emphasize the importance of incorporating landscape patterns across scales into environment management decisions, providing a scientific basis for effective watershed water quality management.
引用
收藏
页数:10
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