小城镇河流底泥沉积物-上覆水磷迁移循环特征

Cycling Characters of Phosphorus Between Water and Sediment of River from a Small Town

通过河流原状沉积物在通气和厌气下实验室模拟培养,通过对河流上覆水,孔隙水和沉积物的磷浓度和形态的分析研究了沉积物-上覆水磷的迁移循环特征。结果表明,对于高营养和长期处于缺氧的河流沉积物,通气条件可改变沉积物的透气性和沉积物有机质的降解速率,通气条件下磷迁移是向上覆水方向,厌气条件下磷迁移是向沉积物方向。通气下沉积物和孔隙水总磷均随培养过程下降,而厌气下反之。对于沉积物形态磷的含量变化在通气和厌气下不同。

With rapid department o f economy,e nvironment of rivers and lakes in sma ll towns suffers from enormou s aggra vation.It has been known that fate of phosphoru s in water and sediment plays an important role in eutrophication of aquatic system.In the year of 2 003,we took some samples of both water and column-sediments from a sma ll river in a small town.These water and sediments were cultivated under both aero bic a nd non-aerobic conditions.The resu lts showed that phosphorus moved up t o water fromsediment under aerobic condition.In contrast,under non-aerobi c condition,phosphorus was prone to be accumulated i n sediment.Phos-phorus d ecreased under aerobic condition and remained relatively consistent in either ab ove or drown-sedim ent.On the other hand,under non-aerobic condition,the phosphorus did no show this phenomenon.It has also been found that decompositio n of organic matter affected the cycle of phosphorus,while conversion on habits for phosphorus was derived from the decom position of organic matter under both aerobic and non-ae robic conditions.