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| Response relationship between land-use change and water quality in Hongfeng Lake basin based on GIS |
| Received:November 22, 2017 |
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| KeyWord:Hongfeng Lake basin;land-use type;ENVI;ArcGIS;water quality |
| Author Name | Affiliation | E-mail | | JIANG Chang | College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | LIU Hong-yan | College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
College of Agriculture, Guizhou University, Guiyang 550025, China | hongyan.L@163.com | | CHEN Zhu | College of Agriculture, Guizhou University, Guiyang 550025, China | | | RAO Cheng | College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | LI Zheng-dao | College of Agriculture, Guizhou University, Guiyang 550025, China | | | YANG Tong-quan | Guiyang Management Bureau of the two lakes and a reservoir, Qingzhen 551400, China | | | WU Pan | College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| In order to understand the relationship between land-use change and water quality in the Hongfeng Lake basin, Landsat TM images from 2001, 2008, and 2016 were interpreted using ENVI 5.2 and ArcGIS 10.2. This paper divides the research area into the following:Water, woodland, farmland, grassland, construction land, and unused land. This is done using supervised classification and artificial correction, and the Spearman correlation analysis to evaluate water quality. The results indicate that Hongfeng Lake basin is dominated by woodland and farmland, accounting for more than 60% of the total area. The farmland, woodland and unused land have, over the last 15 years, been converted to construction land and grassland. The decreasing area of the woodland is 10.68 km2, or 7.30%, but the increasing area of the construction land is 11.41 km2, or 36.11%. The data show that there is an evident positive correlation between the area of the construction land in 2001 and nutrition indexes such as TP, NH3-N and COD, indicating that the pollutants mainly came from industrial and domestic activities before environmental treatment was carried out. In 2008, the nutrition indexes show a positive correlation with the farmland and the construction land, not reaching a significant level, so the point and non-point source might be resultant of poor water quality. In 2016, the correlation coefficients of the farmland with TP, NH3-N, COD and DO are 0.757*, 0.750, 0.786* and 0.847* respectively, which indicates that agricultural non-point source pollution is the dominant contributor to Hongfeng Lake basin after controlling industrial and domestic pollution, however there is a relatively small emission coefficient and water quality is only slightly impacted. Conclusively, the construction land and farmland are regarded as "sources", and the woodlands as "sinks". |
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