太湖北部三个湖区各形态氮的空间分布特征

通过对太湖北部竺山湾、梅梁湾和贡湖上覆水、间隙水和表层沉积物中各形态氮含量的分析,探讨了其中各形态氮的空间分布特征,计算了沉积物-水界面氨氮(NH4+-N)的扩散通量,并对上覆水、间隙水和沉积物中各形态氮进行了相关性分析.结果表明,空间上,上覆水、间隙水和沉积物中,NH4+-N的平均浓度为竺山湾>梅梁湾>贡湖的分布趋势;NO3--N在上覆水和沉积物中为贡湖>梅梁湾>竺山湾的分布趋势,但间隙水中梅梁湾>贡湖>竺山湾;TN在上覆水、间隙水和沉积物中的分布与NH4+-N相似.NH4+-N在竺山湾、梅梁湾和贡湖的平均扩散通量分别为1009.27μmol/(m2×d)、49.35μmol/(m2×d)和3.14μmol/(m2×d).相关性分析表明:上覆水、间隙水、表层沉积物之间NH4+-N存在相关性.

The distribution of nitrogen speciation in three lake regions of North of Taihu Lake

The spatial distribution characteristics and correlations of different nitrogen species in the overlying water, interstitial water and sediment in north of Taihu (Zhushan Bay,Meiliang Bay and Gonghu Bay) have been investigated, meanwhile the diffusion fluxes of NH4+-N have been counted. The spatial characteristic showed that the average concentrations distribution trends of NH4+-N were Zhushan Bay>Meiliang Bay>Gonghu Bay in the overlying water, interstitial water and sediment; the distribution trends of NO3--N were Gonghu Bay>Meiliang Bay>Zhushan Bay in the overlying water and sediment, but Meiliang Bay>Gonghu Bay>Zhushan Bay in interstitial water; TN have the similar distribution trends with NH4+-N in the overlying water, interstitial water and sediment. In Zhushan Bay,Meiliang Bay and Gonghu Bay, the average diffusion fluxes of NH4+-N were 1009.27μmol/(m2·d), 49.35μmol/(m2·d) and 3.14μmol/(m2·d) separately. Significant correlations of NH4+-N was found between overlying water, interstitial water and the surface sediment.