Environmental Science and Pollution Research

, Volume 23, Issue 22, pp 22489–22499 | Cite as

Response of sediment calcium and magnesium species to the regional acid deposition in eutrophic Taihu Lake, China

  • Yu Tao
  • Dai Dan
  • He Chengda
  • Xu QiujinEmail author
  • Wu Fengchang
Research Article


Acid deposition causes carbonate dissolution in watersheds and leads to profound impacts on water chemistry of lakes. Here, we presented a detailed study on the seasonal, spatial, and vertical variations of calcium and magnesium species in the overlying water, interstitial water, and sediment profiles in eutrophic Taihu Lake under the circumstance of regional acid deposition. The result showed that both the acid deposition and biomineralization in Taihu Lake had effects on Ca and Mg species. In the lake water, calcium carbonate was saturated or over-saturated based on long-term statistical calculation of the saturation index (SI). On the sediment profiles, significant difference in Ca and Mg species existed between the surface sediment (0–10 cm) and deeper sediments (>10 cm). The interstitial water Ca2+ and Mg2+, ion-exchangeable Ca and Mg in the surface sediment were higher than those in the deeper sediment. In the spring, when the acid deposition is more intensive, the acid-extracted Ca and Mg in the surface sediment were lower than that in the deeper sediment in the northwest lake, due to carbonate dissolution caused by the regional acid deposition. Spatially, the higher concentration of acid-extracted Ca and Mg in the northwest surface sediment than that in the east lake was observed, indicating the pronounced carbonate biomineralization by algae bloom in the northwest lake. Statistical analysis showed that acid deposition exerted a stronger impact on the variation of acid-extracted Ca and Mg in the surface sediment than the biomineralization in Taihu Lake. For the total Ca and Mg concentration in the spring, however, no significant change between the surface and deeper sediment in the northwest lake was observed, indicating that the carbonate precipitation via biomineralization and the carbonate dissolution due to acidic deposition were in a dynamic balance. These features are of major importance for the understanding of combined effects of acid deposition and eutrophication on freshwater lakes.


Sediment Calcium Magnesium Acid deposition Taihu Lake 



The National Natural Science Foundation of China (No. 41473110, 51278475) and the National Major Science and Technology Project of Water Pollution Control and Treatment of China (No. 2012ZX07506-008) financially supported this study.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Yu Tao
    • 1
    • 2
  • Dai Dan
    • 2
  • He Chengda
    • 1
  • Xu Qiujin
    • 2
    Email author
  • Wu Fengchang
    • 2
  1. 1.College of Environment Science and TechnologyYangzhou UniversityYangzhouChina
  2. 2.State Key Laboratory of Environment Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijingChina

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