苏南典型河段磷的分布及释放特性研究

通过测定常州典型河段河水和底泥中的磷含量,同时分析了磷在不同底泥颗粒中含量分布的变化,阐述了河流中磷的分布和转移趋势。结果表明:河水中的磷含量通常低于底泥间隙水中的磷含量,但当河流发生富营养化后,底泥中的磷大量向上层水体释放,使得河水中的磷含量不断增加。底泥有效磷与总磷含量之间没有明显相关性,而与底泥间隙水的磷含量之间存在着交换平衡。底泥颗粒以2μm~50μm的粒级为主,即以细砂和粉砂质有机-无机聚合体矿物颗粒为主。磷在底泥颗粒中的含量随着底泥粒径的增大而减少,且粒径越大的颗粒对磷的吸附能力越弱,其中的磷向外释放的可能性越大。

Study on Distribution and Release of Phosphorus in the Typical River of Southern Jiangsu Province

Phosphorus in the river water and in the river different particle size of sediment in Changzhou was detected.The result showed the content of phosphorus in the water was commonly lower than that in the interstitial water of sediment,but eutrophication of river would accelerate the release of phosphorus from sediment and enrich phosphorus in the water.And available phosphorus in sediment kept the exchange equilibria with phosphorus in interstitial water.At the same time,the result also showed that the particle size of river sediment was mostly concentrated on 2μm～50μm fractions.With the increase of particle size of sediment,the adsorption capacity of phosphorus decreased and the probability of release of phosphorus increased.