RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (05): 830-836.doi: 10.11870/cjlyzyyhj201605017

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SPATIAL AND TEMPORAL VARIATION OF PHOSPHORUS IN WATER AND SEDIMENT FROM CHAOHU LAKE

LI Guo-lian, XIE Fa-zhi, ZHANG Jin, CHEN Guang-zhou, WANG Jing-rou   

  1. School of Environmental and Energy Engineering, Anhui Jianzhu University, Provincial Key Laboratory of Water Pollution Control and Waste Water Utilization, Hefei 230601, China
  • Received:2015-08-04 Revised:2015-09-24 Online:2016-05-20
  • Supported by:
    Natural Science Foundation of Education Department of Anhui Province (KJ2015JD04, KJ2013A067);Natural Science Foundation of Anhui Province (1608085MB43);the 2013 Doctoral Fund of Anhui Jianzhu University

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Abstract: Phosphorus is the main nutrients to eutrophication in the Chaohu Lake, the study on the content and spatial distribution of phosphorus in sediments can help to guide eutrophication reduction of the Lake. A large number of water and sediment samples were collected from entire lake including its main river entrances. The temporal and spatial variation of total phosphorus and its occurrence characteristics in the Chaohu Lake were investigated. The results showed that the seasonal change trend of total phosphorus contents in Nanfei River and Yuxi River entrances presented a pattern of August May March December. The annual average of total phosphorus content was more than Grade Ⅴ in the Nanfei River entrance, significantly higher than that of the Yuxi River entrance. The spatial distribution indicated that total phosphorus contents in surface water and sediment had a similar trend, the patches of highest contents confined in the entrances near the Hefei City, while there was no significant river input in the eastern lake. Spatial characteristics of total phosphorus in the topsoil (mg·kg-1) of Chaohu Lake and its watershed showed agricultural pollution in the Hangbu river basin and surface runoff in southeastern lake might be the primary nonpoint phosphorus pollution. The correlation coefficient of total phosphorus between surface water and sediment was 0.515, and the total phosphorus contents in surface sediment were significantly decreased during the algal bloom period, suggesting that endogenous phosphorus cycle was key to Chaohu Lake eutrophication. Our results can provide scientific basis for the comprehensive treatment of the pollution in the Chaohu River Basin and the control of blue algae.

Key words: total phosphorus, Chaohu Lake, occurrence characteristics, source

CLC Number: 

  • X522
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