Nitrous Oxide Production in River Sediment of Highly Urbanized Area and the Effects of Water Quality

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• 作者：Dongqi Wang ; Yongjie Tan ; Zhongjie Yu ; Yangjie Li ; Siqi Chang ; Huanguang Deng…
• 关键词：Nitrous oxide ; Production ; River sediment ; Factors ; Urbanization area
• 刊名：Wetlands
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：35
• 期：6
• 页码：1213-1223
• 全文大小：1,066 KB
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• 作者单位：Dongqi Wang (1)
  Yongjie Tan (1)
  Zhongjie Yu (1) (4)
  Yangjie Li (1)
  Siqi Chang (1)
  Huanguang Deng (2)
  Beibei Hu (3)
  Zhenlou Chen (1)
  
  1. School of Geographical Sciences, East China Normal University, Shanghai, 200241, China
  4. Department of Geology & Planetary Science, University of Pittsburgh, Pittsburgh, PA, 15260-3332, USA
  2. School of Environment and Planning, Liaocheng University, Liaocheng, Shandong, 252059, China
  3. School of Urban and Environmental Science, Tianjin Normal University, Tianjin, 300387, China
  
• 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
• 出版者：Springer Netherlands
• ISSN：1943-6246

文摘

Nitrous oxide (N<sub>2sub>O) is one of the main greenhouse gases, which contributes to the global warming and ozone destruction. Sediment cores and river water were collected from an urban and a suburban river for N<sub>2sub>O efflux measurement at the sediment-water interface and the factor-controlled incubations to investigating the N<sub>2sub>O effluxes under varying conditions of dissolved oxygen (DO), ammonium (NH<sub>4sub> +), nitrate (NO<sub>3sub> ?/sup>) and sulfate (SO<sub>4sub> 2?/sup>). Vertical profiles of dissolved N<sub>2sub>O concentrations in pore water were also acquired at eight depths. Results show that N<sub>2sub>O effluxes were higher at the urban site (13.01 ± 6.51 μg N m? h?) than the suburban site (4.02 ± 2.01 μg N m? h?). Oxygen consumption rates were optimal under high DO and NH<sub>4sub> + amendment incubation, highlighting the strong nitrification potential in the sediment surface. Although N<sub>2sub>O effluxes at the urban site increased with the NO<sub>3sub> ?/sup> concentration under low DO condition, DO and NH<sub>4sub> + concentrations in overlying water were the principal factors controlling N<sub>2sub>O effluxes (R = ?.415, p = 0.000 and R = 0.512, p < 0.05, respectively), indicating that nitrification greatly contributed to N<sub>2sub>O production, especially at suburban river. Generally, N<sub>2sub>O efflux was substantially higher in the severely polluted urban river, and the sediments were the source of N<sub>2sub>O in river water. Keywords Nitrous oxide Production River sediment Factors Urbanization area