Inorganic nitrogen release kinetics and exchangeable inorganic nitrogen of the sediments from shallow lakes in the middle and lower reaches of the Yangtze River region

Authors

  • Shengrui Wang,

    Corresponding author
    1. State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Beijing, China
    2. Dongting Lake Ecological Observation and Research Station Chinese Research Academy of Environmental Sciences, Beijing, China
    • Correspondence

      S. Wang, Dongting Lake Ecological Observation and Research Station Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Email: wangsr@craes.org.cn

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  • Lixin Jiao,

    1. State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Beijing, China
    2. Dongting Lake Ecological Observation and Research Station Chinese Research Academy of Environmental Sciences, Beijing, China
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  • Xiangcan Jin,

    1. State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Beijing, China
    2. Dongting Lake Ecological Observation and Research Station Chinese Research Academy of Environmental Sciences, Beijing, China
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  • Juan Wang

    1. State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-Environment, Beijing, China
    2. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, China
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Abstract

Inorganic nitrogen (IN) release kinetics and exchangeable inorganic nitrogen (EIN) of the sediments from shallow lakes in the middle and lower reaches of the Yangtze River region were investigated. The results showed that the EIN contents of the studied sediments ranged from 131 to 274 mg/kg. With the increase of the total nitrogen (TN) contents, their EIN also significantly increased. Their ratios of EIN to TN ranged from 5 to 17%, and with the increase of their TN contents, their ratios decreased. The relative contribution of NH4+-N and NO3-N to EIN ranged from 83 and 11% to 89 and 17%, respectively. The curves of the NO3-N release kinetics of the studied sediments were not completely consistent with those of IN and NH4+-N. The amounts of the IN released from sediments not only relate to their EIN contents, but also to other N fractions.

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