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环境化学  2015 

大气氮湿沉降对青山湖富营养化的影响

Keywords: 湿沉降,富营养化,湿沉降通量

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Abstract:

针对大气湿沉降氮的区域通量问题,通过2008年春、夏季对临安青山湖区湿沉降中氮素化学形态的分析,揭示了大气氮湿沉降的时间分布特征,通过估算大气氮湿沉降的输入通量,研究湿沉降对湖区水体富营养化的贡献.结果表明,春季青山湖降水总氮浓度范围为(1.30±0.02)—(9.80±0.85)mg·L-1,其中铵态氮占总氮比例最高,为40.7%,硝态氮和有机氮的比例分别为33.5%和25.8%;雨水氮浓度随着降雨强度的增大呈显著下降趋势,铵态氮和硝态氮所占的比例随着降雨的进行会逐渐升高,而有机氮的比例却有不断降低的趋势;青山湖春季大气氮沉降负荷为6.64kg·hm-2,雨水中平均的氮浓度为(4.86±0.65)mg·L-1,严重超过了水体富营养化0.2mg·L-1的阈值,对青山湖水生生态系统造成潜在的威胁.

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