摘要
通过2007年8月对大亚湾内13个站位的采样分析,探讨了表层沉积物、表层沉积物间隙水和上覆水中N、P含量的空间分布特征,估算了沉积物-海水界面N、P的扩散通量,并对表层沉积物与间隙水、间隙水与上覆水中N、P含量进行了相关性分析。结果表明,表层沉积物中TN含量的分布总体上是西北高东南低,而TP的分布则表现出东高西低的分布趋势。大部分表层沉积物间隙水中N、P含量远高于上覆水,但两者不具有相同的含量分布趋势。PO4-P、NH4-N、NO2-N和NO3-N在沉积物-海水界面的平均扩散通量分别为6.20、4.83、15.33、4.13μmol/(m2.d)。统计分析表明,表层沉积物TN、TP含量分别与间隙水中N、P的含量大约呈负的线性相关,但相关程度并不高,这与沉积物中有机质分解速率缓慢有关;而N、P在间隙水和上覆水中的含量却无明显相关性,说明间隙水中赋存N、P的浓度并不是其上覆水中N、P含量的决定因素。
The spatial distribution characteristics and correlations of nitrogen and phosphorus in the surface sediment, interstitial water and overlying water in Daya Bay were analyzed. The results showed that the distribution of the content of total nitrogen was higher in the northwest than southeast,and the distribution of the content of total phosphorus was higher in the east than west. The concentrations of nutrients in the interstitial water were much higher than the overlying water, and no similar distribution trend was found between them. According to Fick＇s First Law, the average diffusion flux across sediment-water interface was 6.20μmol/（ m^2· d） for PO4 -P ,4.83 μmol/ （ m^2·d） for NH4 -N, 15.33 μmol/（ m^2· d） for NO2 -N, and 4.13 μmoL/ （m^2· d） for NO3 -N. There were the negative correlations approximately between total nitrogen in the surface sediments and nitrogen in the interstitial water and between total phosphorus in the surface sediments and phosphorus in the interstitial water,but it was not evident,which closely related to the slow decomposition rate of orgarlic matter. For the same nutrient ,the significant correlations were not found between the interstitial water and overlying water. It showed that the concentrations of nutrients in the interstitial water did not decide the concentrations of nutrients in the overlying water.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2011年第4期546-550,共5页
Marine Environmental Science
基金
我国近海海洋生物与生态调查研究资助项目(908-ZC-I-02)
关键词
N
P
空间分布
扩散通量
大亚湾
nitrogen
phosphorus
spatial distribution
diffusion flux
Daya Bay
