摘要
利用自制的静态模拟实验装置,通过连续抽取间隙水来研究藻细胞沉降在沉积物表面后对水-沉积物界面处的N、P变化的驱动作用及影响效果.结果表明,藻细胞沉降后,在50 min内就完全消耗掉水-沉积物界面处的溶解氧,同时水体出现严重的发黑、发臭现象;形成的厌氧、强还原环境,使得死亡的藻细胞在界面处发生强烈的厌氧矿化作用,界面处的水溶性PO34--P、NH 4+-N在实验的第2 d开始向上覆水中扩散,含量不断增加.至实验结束时(实验第8 d),界面处PO34--P、NH 4+-N的含量分别达到4.00 mg/L、39.45 mg/L,分别为同期对照实验样柱中的10倍和241倍(对照样柱中的PO43--P、NH 4+-N的含量分别为0.42 mg/L、0.16 mg/L).藻细胞的厌氧矿化加剧了氮磷营养盐向上覆水的扩散,在加重水体营养盐含量的同时,也为藻华的再次发生提供了物质基础.
The impact and driving effect of deposited algal cells in the water-sediment interface on the N,P changes were studied through continuous extracted pore water with home-made static experiment.Results showed that dissolved oxygen in water-sediment interface was depleted in 50 min after algal cells settled.Soon the dead algal cells formed the anoxia and strong reducing environment and the dead cells had a severe anaerobic mineralization in the water-sediment interface,also the water bodies had a intense black and stink phenomenon.PO4^3--P,NH 4^＋-N concentration in water-sediment interface increased from the 2nd day after added the algal cells to the sediment interface,and its concentration was 4.00 mg /L and 39.45 mg /L,respectively.Its concentration was the 10 fold and 241 fold higher than that the control experiments at the same time（PO4^3--P,NH 4^＋-N concentration in control experiments was 0.42 mg /L and 0.16 mg /L,respectively）.Anaerobic mineralization of dead cells in sediment surface drove the nutrients diffusing upward the overlying water,added the nutrients concentration in water bodies,and it also supplied the nutrient materials for the algal blooms happened again.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第12期2917-2924,共8页
Environmental Science
基金
国家自然科学基金项目(50979102
20907057
40901253)
江苏省社会发展科技专项(BE2009603)
江苏省自然科学基金项目(BK2009332)
关键词
藻源性黑水团
水-沉积物界面
藻华
营养盐
algal blooms induced black spots
water-sediment interface
algal blooms
nutrients
作者简介
刘国锋（1979～），男，博士，主要研究方向为湖泊水环境污染及生态治理，E—mail：njliugf@yahoo．cn
通讯联系人，E-mail：cxfan@niglas．ac．cn
