研究论文
杨晶,张桂玲,赵玉川,李佩佩.胶州湾河口潮滩沉积物中N2 O的产生和释放及其影响因素[J].环境科学学报,2011,31(12):2723-2732
胶州湾河口潮滩沉积物中N2 O的产生和释放及其影响因素
- Production and emission of nitrous oxide from the estuarine tidal flat around Jiaozhou Bay and their influencing factors
- 基金项目：国家自然科学基金项目(No.41076067, 40506025);教育部新世纪优秀人才支持计划(No.NCET-08-0507)
- 作者
- 单位
- 杨晶
- 1. 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100;
2. 河北省环境科学研究院, 石家庄 050037
- 张桂玲
- 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100
- 赵玉川
- 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100
- 李佩佩
- 中国海洋大学海洋化学理论与工程技术教育部重点实验室, 青岛 266100
- 摘要：分别于2007年12月,2008年5月,9月和11月,2009年2月在胶州湾周边潮滩采集柱状沉积物进行培养实验,测定硝化、反硝化速率和沉积物-水界面N2O交换通量,并对其影响因素进行了初步探讨.结果表明: 胶州湾周边河口潮滩沉积物中的反硝化速率明显高于硝化速率,二者均呈现明显的季节变化.大沽河口潮滩沉积物反硝化速率变化范围为(9.55~104)μmol·m-2·h-1(以N计,下同), 其中春季最强, 冬季最弱,主要受到温度和生物量的影响.娄山河口潮滩沉积物夏季的反硝化速率(215 μmol·m-2·h-1)高于冬季(30.2 μmol·m-2·h-1),主要受到上覆水中NO3-浓度和有机质的综合影响.硝化速率在大沽河口的变化范围为(0~5.11)μmol·m-2·h-1,在娄山河口的变化范围为(0~0.054)μmol·m-2·h-1.两个河口潮滩沉积物在夏季基本没有硝化过程发生,主要受到溶解氧的影响.大沽河和娄山河口沉积物-水界面N2O交换通量均呈现明显的季节变化, 变化范围分别为(-0.51~4.18)μmol·m-2·h-1和(0.27~1.68)μmol·m-2·h-1.从全年来看, 两个河口潮滩沉积物均表现为N2O的较强释放源, 其N2O主要来自于反硝化过程.
- Abstract：Nitrification rates, denitrification rates and the sediment-water N2O fluxs were determined during surveys at the tidal flats of Dagu estuary and Loushan estuary in December 2007, May, September and November 2008 and February 2009. The results showed that the nitrification and denitrification rates in tidal flat sediments had obviously seasonal and spatial variations, with the denitrification rates higher than the nitrification ones. At Dagu estuary, denitrification rates ranged from 9.55 to 104 μmol·m-2·h-1 with maximum values occurring in spring and lowest values occurring in winter due to the influence of temperature and biomass. At Loushan estuary, denitrification rate in summer (215μmol·m-2·h-1) was higher than that in winter (30.2 μmol·m-2·h-1) due to the influence of organic matter and the concentration of nitrate in the overlying water. Nitrification rates ranged from 0 to 5.11 μmol·m-2·h-1 at Dagu estuary, and from 0 to 0.054 μmol·m-2·h-1 at Loushan estuary. Because of the influence of dissolved oxygen, nitrification hardly happened in summer at both estuaries. The sediment-water N2O fluxes showed obvious seasonal variations at Dagu and Loushan estuary, which were estimated to be -0.51~4.18 μmol·m-2·h-1 and 0.27~1.68 μmol·m-2·h-1, respectively. On an annual scale, the tidal flat sediments surrounding Jiaozhou Bay was a main source of N2O in the water column and N2O mainly came from denitrification.
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