Abstract:The role of denitrifying bacteria and the influence of environmental factors such as temperature and salinity on the denitrification process in summer in surface sediment at adjacent sea area of the Yangtze River Estuary, China was evaluated. The quantities of denitrifying bacteria at the eight sampling sites ranged from 3.9×105 cells/g to 110.0×105 cells/g, which were significantly correlated with salinity and dissolved oxygen. The average denitrification rates measured using the acetylene inhibition technique ranged from 101.3μmol/(m2·h) to 731.9μmol/(m2·h). Their significant correlationship with the quantity of denitrifying bacteria (P=0.950) indicated that denitrifying bacteria was the determining factor. The denitrification rate was also primarily affected by the salinity and the concentrations of DO and ammonia. The nitrogen flux by the denitrification process was calculated to be 8.19×105kg/d, which was equivalent to nearly one-third of the inorganic nitrogen consumption amount during primary production process at the corresponding area. Thus, bacteria denitrification played a significant role in the cycling and removal of nitrogen at study sea area.
李佳霖, 白洁, 高会旺, 王晓东, 于江华, 张桂玲. 长江口海域夏季沉积物反硝化细菌数量及反硝化作用[J]. 中国环境科学, 2009, 29(7): 756-761.
LI Jia-Lin, BAI Jie, GAO Hui-Wang, WANG Xiao-Dong, YU Jiang-Hua, ZHANG Gui-Ling. Quantification of denitrifying bacteria and denitrification process in surface sediment at adjacent sea area of the Yangtze River Estuary in summer. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(7): 756-761.