生物扰动下水/沉积物体系中pH,DO和p_(CO_2)的变化规律

利用平面光极技术,制备pH、溶解氧(DO)和CO_2分压(p_(CO_2))荧光传感膜,构建集3种膜于一体的水/沉积物模拟体系,并研究颤蚓扰动作用下体系中pH,DO,p_(CO_2)的二维分布与协同变化规律.结果表明:无生物扰动体系中上覆水和沉积物各参数变化较小;存在颤蚓扰动体系中各参数随时间变化均较显著,随着扰动时间延长,体系中pH,DO,p_(CO_2)呈均一化趋势;在有生物扰动的体系中,3个参数间存在一定的协同变化趋势并相互影响.

Variation of pH,DO and pCO2 in Water/Sediment System under Bioturbation

Using planar optode technology, we prepared fluorescence sensing membrane of pH, dissolved oxygen (DO) and partial presure of CO₂ (p_CO2), constructed3 kinds of membrane in the simulated water/sediment system, and studied the two dimensional distributions and coordinated variation of pH, DO and p_CO2 in the system of the disturbance of the tubificid. The results show that there are hardly any changes in the parameters of overlying water and sediment system without the presence of bioturbation. On the contrary, there is obvious and coordinated variation in various parameters of system of the disturbance of the tubificid with time. The pH,DO and p_CO2in the system tend to be uniform with the extension of the disturbance time. There exists a certain coordinated variation tendency and interactions among three environmental parameters in the system with the presence of bioturbation.