乌梁素海表层沉积物与上覆水间氮磷迁移规律分析

Research on Nitrogen,Phosphorus Transport Law between the Surface Sediments and Overlying Water in Wuliangsuhai Lake

通过同步监测表层沉积物和上覆水体氮磷浓度以及环境因子(pH值、温度、溶解氧等),利用回归分析方法,对溶解氧、表层沉积物有机质含量与上覆水体氮磷浓度之间的关系以及氮磷在表层沉积物和上覆水体间迁移规律进行探讨。结果表明,高水温、碱性环境有利于氮磷营养物质的释放;上覆水体氮磷浓度与溶解氧呈现显著非线性负相关关系,与表层沉积物中有机质含量呈现显著线性正相关关系,且冬季极显著;表层沉积物氮磷含量与上覆水体氮磷浓度呈现出互补的动态特征。

By monitoring simultaneously nitrogen phosphorus in the surface sediments and overlying water,environmental factors such as pH,temperature,dissolved oxygen and so on,a regression analysis is used to study the correlation between nitrogen phosphorus of overlying water and dissolved oxygen,organic matter content of the surface sediments.At the same time the migration rule of nitrogen phosphorus in the surface sediments and overlying water is studied.The results show that high temperature,alkaline environment are favorable for releasing nitrogen and phosphorus.Nitrogen phosphorus of overlying water and dissolved oxygen show a significant nonlinear negative correlation.Nitrogen phosphorus of overlying water and organic matter content in the surface sediments show significant positive linear correlation which is highly significant in Winter.Organic matter content in the surface sediments and nitrogen phosphorus of overlying water show the dynamic and complementary characteristics.