NH3-N浓度对太湖竺山湾水体及沉积物中硝化作用的影响

被引：5

作者：

陈国元

机构：

[1] 厦门理工学院水资源环境研究所

来源：

水生态学杂志 | 2012年 / 33卷 / 02期

关键词：

非离子态氨; 太湖; 水体; 沉积物; 硝化作用;

D O I：

10.15928/j.1674-3075.2012.02.015

中图分类号：

X131.2 [水污染化学];

学科分类号：

摘要：

通过模拟培养试验,比较不同浓度非离子态氨(NH3-N)条件下,富营养化湖泊———太湖竺山湾水体及沉积物中硝化作用2个过程,即氨氧化和亚硝酸盐氧化的发生情况。结果表明,在试验设置的NH3-N浓度范围内,水体和沉积物中氨氧化速率都随着NH3-N浓度的升高显著增加(LSD检验,P<0.05),亚硝酸盐氧化速率却呈阶段性变化。水体中NH3-N浓度大于0.35 mg/L时,亚硝酸盐氧化速率开始显著降低(LSD检验,P<0.05),而氨氧化速率与亚硝酸盐氧化速率的比值从NH3-N浓度为0.15 mg/L开始随着NH3-N浓度的升高而显著增加,说明水体中亚硝酸盐氧化过程在NH3-N浓度为0.15 mg/L时已受到部分抑制;沉积物中亚硝酸盐氧化速率在NH3-N浓度大于0.65 mg/L时开始降低(LSD检验,P>0.05),而氨氧化速率与亚硝酸盐氧化速率的比值从NH3-N浓度为0.35 mg/L开始随着NH3-N浓度的升高而显著增加,说明沉积物中亚硝酸盐氧化过程在NH3-N浓度为0.35 mg/L时已受到部分抑制。太湖竺山湾水体中的NH3-N浓度为0.19 mg/L,已达到对亚硝酸盐氧化过程的抑制范围;沉积物间隙水中NH3-N浓度为0.16 mg/L,还未对亚硝酸盐氧化过程产生抑制效果。

引用

页码：55 / 60

页数：6

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