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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。
Based on the sampling analysis of 13 stations in Daya Bay in August 2007, the spatial distribution characteristics of N and P in surface sediment, surface sediment interstitial water and overlying water were discussed, and the relationships between sediment-seawater interface N, P The flux of N and P in surface sediments, interstitial water, interstitial water and overlying water were analyzed. The results show that the distribution of TN in the surface sediments is generally high in the southeast of northwest while the distribution of TP shows the distribution trend of high in the east and low in the west. The N and P contents in most surface sediment interstitial water are much higher than those in overlying water, but the two do not have the same content distribution trend. The average fluxes of PO4-P, NH4-N, NO2-N and NO3-N at the sediment-seawater interface were 6.20, 4.83, 15.33 and 4.13 μmol / (m2.d), respectively. The statistical analysis shows that the contents of TN and TP in surface sediments are negatively correlated with the N and P contents in interstitial water, respectively, but the correlation degree is not high, which is related to the slow decomposition rate of organic matter in sediments. There was no obvious correlation between the contents of interstitial water and overlying water, indicating that the concentrations of N and P in interstitial water are not the determinants of N and P content in overlying water.