Liu Guo-Feng, Shen Qiu-Shi, Zhang Lei, Fan Cheng-Xin, Zhong Ji-Cheng, Yan Shao-Hua
State Key Laboratory of Lake & Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2010 Dec;31(12):2917-24.
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, NH4(+) -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, NH4(+) -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.
通过自制静态实验连续提取孔隙水，研究了水-沉积物界面中沉积藻类细胞对氮、磷变化的影响及驱动作用。结果表明，藻类细胞沉降后50分钟内，水-沉积物界面中的溶解氧耗尽。很快，死亡的藻类细胞形成了缺氧和强还原环境，死亡细胞在水-沉积物界面发生严重的厌氧矿化，水体也出现强烈的黑臭现象。从藻类细胞添加到沉积物界面后的第2天起，水-沉积物界面中的PO4(-3)-P、NH4(+)-N浓度增加，其浓度分别为4.00mg/L和39.45mg/L。其浓度分别是同时对照实验的10倍和241倍（对照实验中PO4(-3)-P、NH4(+)-N浓度分别为0.42mg/L和0.16mg/L）。沉积物表面死亡细胞的厌氧矿化驱动营养物质向上覆水体扩散，增加了水体中的营养物质浓度，也为再次发生的藻华提供了营养物质。
