摘要
为了较好地了解上覆水体扰动对水产养殖池塘底泥氮磷释放的影响,通过室内水池模拟实验,采集水产养殖池塘底泥并放置于实验水池,连续7天内的固定时间段,采用搅拌器扰动上覆水体,测定上覆水体及底泥间隙水的氨氮、硝酸盐氮、溶解态活性磷指标。结果表明:搅拌速度增大能在初期加大氨氮的释放,水动力条件下氨氮释放是短期效应,达到一定程度后将逐渐达到释放与吸附的平衡;搅拌速度增大能够增加硝酸盐氮的释放速率与浓度峰值,间隙水硝酸盐氮释放速率在静态与动态条件下有显著差异;溶解态活性磷释放速率随搅拌速度的增大有一定程度的增加,准一级动力学方程对其释放过程拟合效果较好,相关性均达0.92以上,且达到极显著水平(P<0.01),可以较好地描述溶解态活性磷释放过程。
To better understand the effect of disturbance in overlying water on nitrogen and phosphorus release from aquaculture pond sediments, we collected sediment samples from aquaculture ponds, designed laboratory experiments of nitrogen and phosphorus release in the condition of overlying water stirred mechanically for seven consecutive days at different stirring speeds, and measured concentrations of ammonia nitrogen, nitrate nitrogen and SRP in the overlying water and sediment pore water. The results showed that faster mechanical stirring increased the concentration of ammonia nitrogen at the early stage but in hydrodynamic conditions it was a short-term effect and a dynamic equilibrium between release and adsorption was gradually reached. A higher stirring speed promoted the release rate of nitrate nitrogen with a higher peak concentration, indicating the release rate of nitrate nitrogen from the pore water in dynamic ponds to be significantly different from that in the static pond case. The release rate of SRP was also increased to a certain degree by increasing the stirring speed. Fitting of pseudo-first-order kinetic equations to the process of SRP release reveals multiple correlation coefficients R2 greater than 0.92 and an extremely significant level （P 〈 0.01） of the equations fitted, showing a satisfactory representation of the process.
出处
《水力发电学报》
EI
CSCD
北大核心
2016年第12期86-96,共11页
Journal of Hydroelectric Engineering
基金
国家科技支撑计划课题(2012BAD25B04)
国家自然科学基金(51579106)
农业部热带亚热带水产资源利用与养殖重点实验室开放课题资助
关键词
扰动
上覆水
氮
磷
养殖池塘底泥
释放
disturbance
overlying water
nitrogen
phosphorus
aquaculture pond sediments
release
