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Spatiotemporal Patterns in pCO 2 and Nutrient Concentration: Implications for the CO 2 Variations in a Eutrophic Lake

Author

Listed:
  • Jie Xu

    (Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China)

  • Zheng Zhou

    (Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China)

  • Jie Chen

    (Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China)

  • Haihua Zhuo

    (Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China)

  • Jie Ma

    (Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China)

  • Yunbing Liu

    (Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China)

Abstract

Lakes are considered sentinels of terrestrial environmental change. Nevertheless, our understanding of the impact of catchment anthropogenic activities on nutrients and the partial pressure of carbon dioxide (pCO 2 , an important parameter in evaluating CO 2 levels in water) is still restrained by the scarcity of long-term observations. In this study, spatiotemporal variations in nutrient concentrations (total nitrogen: TN, total phosphorus: TP, nitrate: NO 3 − –N, and ammonium: NH 4 + –N) pCO 2 in Taihu Lake were analyzed from 1992 to 2006, along with the gross domestic product (GDP) and wastewater discharge (WD) of its catchment. The study area was divided into three zones to characterize spatial heterogeneity in water quality: the inflow river mouth zone (Liangxi River and Zhihugang River), transition zone (Meiliang Bay), and central Taihu Lake, respectively. It is abundantly obvious that external nutrient inputs from the catchment have a notable impact on the water parameters in Taihu Lake, because nutrient concentrations and pCO 2 were substantially higher in the inflow river mouth zone than in the open water of Meiliang Bay and central Taihu Lake. The GDP and WD of Taihu Lake’s catchment were significantly and positively correlated with the temporal variation in nutrient concentrations and pCO 2 , indicating that catchment development activities had an impact on Taihu Lake’s water quality. In addition, pCO 2 was negatively correlated with chlorophyll a and the saturation of dissolved oxygen, but positively correlated with nutrient concentrations (e.g., TN, TP, and NH 4 + –N) in inflow river mouth zone of Taihu Lake. The findings of this study reveal that the anthropogenic activities of the catchment not only affect the water quality of Taihu Lake but also the CO 2 concentrations. Consequently, catchment effects require consideration when modeling and estimating CO 2 emissions from the extensively human-impacted eutrophic lakes.

Suggested Citation

  • Jie Xu & Zheng Zhou & Jie Chen & Haihua Zhuo & Jie Ma & Yunbing Liu, 2022. "Spatiotemporal Patterns in pCO 2 and Nutrient Concentration: Implications for the CO 2 Variations in a Eutrophic Lake," IJERPH, MDPI, vol. 19(19), pages 1-13, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:19:p:12150-:d:924890
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    References listed on IDEAS

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    1. Álvarez, X. & Valero, E. & Santos, R.M.B. & Varandas, S.G.P. & Sanches Fernandes, L.F. & Pacheco, F.A.L., 2017. "Anthropogenic nutrients and eutrophication in multiple land use watersheds: Best management practices and policies for the protection of water resources," Land Use Policy, Elsevier, vol. 69(C), pages 1-11.
    2. Peter A. Raymond & Jens Hartmann & Ronny Lauerwald & Sebastian Sobek & Cory McDonald & Mark Hoover & David Butman & Robert Striegl & Emilio Mayorga & Christoph Humborg & Pirkko Kortelainen & Hans Dürr, 2013. "Global carbon dioxide emissions from inland waters," Nature, Nature, vol. 503(7476), pages 355-359, November.
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