|Yang Longyuan,Wayne S. Gardner.The Sediment Denitrification Rates Measurement and Their Spatial and Temporal Character Analysis in Saginaw Bay, Lake Huron. J. Lake Sci.1998,10(3):32-38. DOI:10.18307/1998.0306
|关键词: 反硝化率 沉积物 休伦湖 N2生成法
|The Sediment Denitrification Rates Measurement and Their Spatial and Temporal Character Analysis in Saginaw Bay, Lake Huron
Yang Longyuan1, Wayne S. Gardner2
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008;2.National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, Michigan 48105, USA
|The denitrfication rates (DR) of sediment in Saginaw Bay, Lake Huron, have been measured with No production method. Triplicate samples of sediment core were collected at two GLERL long-term monitoring sites of the Bay in July and August of 1995. The DR is 16. 0-39,6 and 22. 7-26. 1 micromol N:/(m2·h) in the Inner and Outer regions of Saginaw Bay. respectively. The spatial and temporal characters of DR in Saginaw Bay was studied also in this paper, The DR was influenced by the interaction between the Saginaw River as a main pollution source and Lake Huron as a reservoir of high quality water. According to the measured DR, it has been evaluated that the nutrient condition of Saginaw Bay is oligotrophic/mesotrophic level in the present period. The molar ratios of N2 : TIN were kept constant at both sampling sites and not seriously changed with sampling time. The DR was positively correlated to O2 consumption rates in the headspace of timecours. Additionally,a negative correlationship between NH+4 and NO-3 concentrations in the overlying water was found.
|Key words: Denitrification rate sediment N2 production method Lake Huron