Journal of Ecology and Rural Environment ›› 2016, Vol. 32 ›› Issue (1): 68-75.doi: 10.11934/j.issn.1673-4831.2016.01.012

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Spatial-Temporal Variation and Developing Tendency of Water Quality in Gucheng Lake and Inlets and Outlets of the Lake

GU Xian-kun1,2, GU Xiao-hong1, ZENG Qing-fei1, MAO Zhi-gang1, LI Xu-guang2,3, WANG Yin-ping1,2, WANG Wen-xia1,2   

  1. 1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Freshwater Fisheries Research Institute of Jiangsu Province, Nanjing 210017, China
  • Received:2015-06-15 Online:2016-01-25 Published:2016-01-27


Water samples were collected from Gucheng Lake and its inlets and outlets during the period between July 2012 and July 2013 for analysis of physic-chemical properties(including nutrient contents, BOD5, suspended organic matter) to explore spatio-temporal variation of the water quality of the lake and based on the monitoring data accumulated during the year of 2001-2012, developing tendency of the water quality in the lake in recent years was also analyzed with the aid of Software PWQTrend 2010. Results show that the water in the main area of the lake, Gangkou River and Qiqiao River was quite good in quality and got slightly eutrophied during the wet season, but the water in arms of the lake, in waste discharge outlet of aquatic breeding zones, and in Guanxi River and Xuhe River was quite high in pollution load and got moderately eutrophied during the wet season. However, during the dry season, the water in the whole area(the main area, arms, inlets and outlets of the lake) was moderately entrophied. Currently nitrogen and phosphorus are the main water pollutants in this study area, and come mainly from aquaculture. During the year of 2001-2012, the water in Guanxi River and the arms of the lake fell generally into Grade Ⅲ/Ⅳof the "National Standard for Surface Water Quality for Drinking Water", and the water in the main lake area did into Grade Ⅲ in quality. Total nitrogen(TN) and total phosphorus(TP) in the water of Guanxi River decreased significantly from 2001 to 2012, but TN in the arms of the lake and TN and TP in the main lake area increased significantly as affected by the economic development in Gaochun District, and some environmental protection measures. Therefore, rationally programming development scale and mode of the aquaculture in the lake and reducing waste discharge from various pollution sources are essential measures for sustainable development of Gucheng Lake.

Key words: water quality, spatio-temporal variation, changing tendency, Gucheng Lake, inlets and outlets of the lake

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