控制排水条件下排水沟中磷素浓度衰减规律研究

Phosphorus plays a key role in lake eutrophication. Rice fields drainage is the main way of phosphorus loss. The Attenuationlaw of the P content and weight and the change law of different forms of phosphorus varying with time were analyzed. The exsisting form and the attenuation law of Phosphorus at different water layers were also studied. The results showed that, storing rice fields drainage in drain ditch for 3 to 5 days can achieve very good effect to remove Phosphorus. Water_soluble phosphates was the main loss. It also showed that there was a positive correlation between the P content and weight and depth. the rate of the water_soluble phosphates is increased with the passage of time.the rate of water_soluble phosphates was negatively correlated with water depth.