湖泊底泥疏浚环境效应:Ⅲ.对沉积物反硝化作用的影响

被引:15
作者
钟继承
刘国锋
范成新
白秀玲
李宝
张路
丁士明
机构
[1] 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室
关键词
底泥疏浚; 反硝化; 环境因子; 太湖;
D O I
暂无
中图分类号
P342 [水文化学];
学科分类号
081501 ;
摘要
通过为期一年的疏浚模拟试验,在试验室培养疏浚与对照柱样,研究了底泥疏浚对沉积物反硝化过程的影响.沉积物反硝化速率的测定采用经典的乙炔抑制法,研究结果表明,在一年的试验周期内,疏浚和对照柱沉积物的反硝化速率分别为6.9-26.9nmol/(g·h)和21.6-102.7nmol/(g·h),除2006年的2月外的其他月份,疏浚沉积物的反硝化速率显著(P<0.05)低于未疏浚对照沉积物,同时还研究了环境因子对沉积物反硝化速率的影响,结果表明,疏浚和对照沉积物的反硝化速率都受温度的控制,硝态氮浓度是疏浚和对照沉积物反硝化速率的主要限制因子,有机碳对疏浚沉积物的反硝化速率有影响,但对未疏浚对照沉积物的反硝化速率没有影响.疏浚后短期内沉积物反硝化速率低于未疏浚对照沉积物,可看作是底泥疏浚在富营养华水体脱氮方面的一个负效应.
引用
收藏
页码:465 / 473
页数:9
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