摘要
用N2生成法测定了北美休伦湖Saginaw湾1995年夏季7、8月份沉积物反硝化率，Saginaw湾内湾的沉积物反硝化率为16．0－39．6μmolN2／（m2·h），外湾沉积反硝化率为22．7 －26．1μmolN2／（m2·h），比较了不同湖泊沉积物反硝化率数值大小，指出休伦湖Saginaw湾水体现阶段的营养状况为贫－中营养水平．内外湾沉积物反硝化率数值波动大小与Saginaw河及休伦湖的影响有关；N2：TIN通量比值有不随采样时间的变化而变更等特性．在反硝化率测定过程中，反硝化率与O2消耗率之间有明显的正相关关系；沉积物上覆水中NH+4与NO-3之间通量值在变化趋势上有明显的负相关关系。
The denitrfication rates (DR) of sediment in Saginaw Bay. Lake Huron, have been measured with N2 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. 039. 6 and 22. 7 - 26. 1 micromol N2/(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 NO3- concentrations in the overlying water was found.
出处
《湖泊科学》
EI
CAS
CSCD
1998年第3期32-38,共7页
Journal of Lake Sciences
基金
中国科学院项目!"中国生态系统研究网络(CERN)"
美国商业部大气海洋局(NOAA)大湖环境研究实验室共同资助
关键词
反硝化率
沉积物
休伦湖
N2生成法
湖泊
Denitrification rate, sediment, N_2 production method, Lake Huron
