摘要
采用现场采样及室内分析测试方法,研究了内秦淮河沉积物间隙水中营养盐状况。结果表明,间隙水中氮磷浓度均远高于上覆水中氮磷浓度,有较强的释放趋势,间隙水中PO34--P及NH_4^+-N含量随着深度的增加而增大,但PO34--P含量增加幅度不及NH4+-N明显。相关系数显著性检验表明,间隙水中总溶解性磷(TDP)与PO34--P、Fe2+与PO43--P及NH4+-N、沉积物中总磷(TP)与间隙水中PO34--P均存在显著的相关性,其中TDP与PO43--P、Fe2+与PO43--P相关程度较高,说明间隙水中TDP的变化主要受PO43--P的影响,沉积物中磷的释放与沉积物氧化还原条件密切相关。这项研究可为内秦淮河内源污染与富营养化的控制和治理提供理论参考。
The nutrient salts in the system of sediment-porewater in inner Qinhuai river were studied. The result showed that the concentra- tion of N and P in the porewater were much higher than that in the overly water in the inner Qinhuai river, indicating that N and P tended to release from sediment to water. The content of dissolved P and ammonia nitrogen increased with degree of depth, but the increase of dissolved P was less than that of ammonia nitrogen. There were significant correlations between the total dissolved P and dissolved P in the porewater and between ferrous iron and the dissolved P and ammonia nitrogen, the total P in sediment also correlated significantly with the dissolved p in the porewater, indicating that the total dissolved P in porewater was mainly influenced by the dissolved P and the release of P in sediment, which closely related to the condition of oxidation -reduction of sediment. These experimental results provided theoretical basis in controlling phosphorus release from sediments to the water in these city rivers.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第4期1245-1249,共5页
Journal of Agro-Environment Science
基金
河海大学水文水资源与水利工程科学国家重点实验室开放研究基金(2005408611)
关键词
间隙水
氮
磷
沉积物
相关关系
porewater
nitrogen
phosphorus
sediment
correlation
