太湖流域典型河流沉积物的反硝化作用

被引：22

作者：

张波 ^{[1
,2
]}

杜应旸 ^{[1
,2
]}

陈宇炜 ^{[1
]}

张路 ^{[1
]}

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

[2] 中国科学院研究生院

来源：

环境科学学报 | 2012年 / 32卷 / 08期

关键词：

太湖流域; 河流; 沉积物; 反硝化; 同位素;

D O I：

10.13671/j.hjkxxb.2012.08.017

中图分类号：

X131.2 [水污染化学];

学科分类号：

摘要：

用15N同位素配对法对太湖流域江苏和上海境内主要河流沉积物的反硝化作用及其影响因素进行研究.结果表明,河流沉积物反硝化作用具有显著空间差异.25℃时,河流总反硝化速率Dtot在0～4.03mmol.m-.2d-1之间;10℃时,Dtot在0～2.27mmol.m-.2d-1之间,平均值分别为0.79mmol.m-.2d-1和0.26mmol.m-.2d-1.相关性分析显示,沉积物的反硝化作用与沉积物氮含量和实验过程中的耗氧速率(SOD)呈显著相关关系(p<0.01).以总反硝化速率大小为依据将沉积物分成4组后的相关分析表明,反硝化速率与原位上覆水中的NO3--N含量之间亦存在显著的相关关系(p<0.05),预示着反硝化作用对水体氮负荷起到的氮汇作用.

引用

页码：1866 / 1873

页数：8

共 21 条

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