CHARACTERISTICS AND DISTRIBUTION OF NITROGEN FORMS IN SEDIMENTS OF BAIYANGDIAN LAKE IN SUMMER AND AUTUMN
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摘要: 为研究白洋淀夏秋季各典型淀区沉积物中氮赋存形态及分布特征,采用逐级提取方法将沉积物中氮分为离子交换态氮(IEF-N)、弱酸可浸取态氮(WAEF-N)、强碱可浸取态氮(SAEF-N)和强氧化剂可浸取态氮(SOEF-N),并对沉积物各形态可转化态氮与间隙水氨氮、硝氮的相关性进行分析。结果表明:夏季沉积物TN含量为3195.95~6335.34 mg/kg,秋季沉积物TN含量为3553.89~5786.3 mg/kg,原始区和养殖区的TN含量夏秋两季差异最大;夏秋两季15个采样点及5个功能区各形态氮含量均表现为WAEF-N>SOEF-N>SAEF-N>IEF-N,各形态可转化态氮含量无明显的季节变化特征;相关分析表明,沉积物中的弱酸可浸取态氨氮、硝氮与间隙水中的氨氮、硝氮在夏秋两季均相关性显著(P<0.05)。Abstract: In order to study the form and distribution characteristics of nitrogen in the sediments of Baiyangdian Lake in summer and autumn, the sediment nitrogen was classified into ion exchangeable form nitrogen(IEF-N), weak acid extractable form nitrogen(WAEF-N), strong alkali extractable form nitrogen(SAEF-N) and strong oxidant extractable form nitrogen(SOEF-N), by the method of extraction step by step. Meanwhile, the relationship between sediment nitrogen and interstitial water was also investigated. The results showed that the total nitrogen content of the sediments ranged from 3195.95~6335.34 mg/kg in summer and 3553.89~5786.3 mg/kg in autumn. The difference of total nitrogen content between original area and cultured area was the largest in summer and autumn. In the 15 sampling sites and 5 functional areas in summer and autumn, the orders of contents of all nitrogen forms were WAEF-N> SOEF-N>SAEF-N>IEF-N. Correlation analysis showed that ammonia and nitrate nitrogen of WAEF in sediments had significant correlation with ammonia nitrogen and nitrate nitrogen in pore water in summer and autumn(P<0.05). The study on nitrogen form in surface sediments of Baiyangdian Lake can provide a theoretical basis for lake management.
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Key words:
- Baiyangdian Lake /
- summer and autumn /
- sediment /
- convertible nitrogen /
- fractionated extraction method
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