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Spatio-Temporal Distribution of Total Nitrogen and Phosphorus in Dianshan Lake, China: The External Loading and Self-Purification Capability

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  • Guohua Xiong

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

  • Guochen Wang

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

  • Dongqi Wang

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

  • Weilin Yang

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

  • Yuanyuan Chen

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

  • Zhenlou Chen

    (Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
    School of Geographical Sciences, East China Normal University, Shanghai 200241, China)

Abstract

In this article, long-term data, statistical analysis, and spatial interpolation method were applied to the analyses of the spatial and temporal changes of total nitrogen (TN) and total phosphorus (TP) in Dianshan Lake. We also estimated the self-purification capability of TN and TP in Dianshan Lake. The results showed that interannual variability of the average concentration of TN in Dianshan Lake changed significantly, showing a characteristic increase before a decline, and the average concentration of TN showed an obvious downward trend, especially after 2007. Interannual variability of the average concentration of TP in Dianshan Lake fluctuated, and the average concentration of TP showed a downward trend after 2007. The seasonal variations of TN and TP in Dianshan Lake were similar. Higher TN concentration occurred in winter and spring, while higher TP concentration appeared in summer, autumn, and winter. The spatial distribution of TN and TP in Dianshan Lake were similar, showing a characteristic which decreased from north to south and west to east. The highest TN and TP values were mainly distributed in the inlet monitoring sites, while the lowest TP values were distributed in the outlet monitoring sites. The self-purification capability of TN and TP were about 2289.97 t/yr and 112.16 t/yr, which suggested a deterioration of natural water quality. Our research showed that Dianshan Lake was highly eutrophic and that water quality showed a substantial improvement from 1996 to 2015.

Suggested Citation

  • Guohua Xiong & Guochen Wang & Dongqi Wang & Weilin Yang & Yuanyuan Chen & Zhenlou Chen, 2017. "Spatio-Temporal Distribution of Total Nitrogen and Phosphorus in Dianshan Lake, China: The External Loading and Self-Purification Capability," Sustainability, MDPI, vol. 9(4), pages 1-11, March.
    • Handle: RePEc:gam:jsusta:v:9:y:2017:i:4:p:500-:d:94166
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    References listed on IDEAS

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    1. GuoLiang Wei & ZhiFeng Yang & BaoShan Cui & Bing Li & He Chen & JunHong Bai & ShiKui Dong, 2009. "Impact of Dam Construction on Water Quality and Water Self-Purification Capacity of the Lancang River, China," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 23(9), pages 1763-1780, July.
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