沉积物-水界面磷交换模拟研究中环境因子的动态规律分析

Dynamic Rules for some Environmental Factors in the Simulative Experiment of Phosphorus Exchange at Sediment-water Interface

在模拟磷酸盐在沉积物-水界面的交换研究中对相关的环境因子进行了动态监测与相关分析。通过根际土壤溶液采样器等工具连续监测溶解氧(DO)、电导率(Cond)、pH、氧化还原电位(ORP)等参数在模拟系统中上覆水及沉积物的不同层次的动态,并分析了各参数在各层间的相互关系以及相互影响作用。结果表明:上覆水底层DO浓度显著低于中上层;上覆水各层电导率没有显著差异且随时间线性上升;pH动态具有显著的空间差异性,界面位置是pH的突变点,上覆水pH的变化滞后于间隙水;沉积物ORP低于上覆水,界面是突变点。沉积物上层和上覆水与DO各层ORP呈正相关,但与底层间隙水ORP无关,其他参数间的相互作用不明显。

Some environmental factors were dynamically monitored and their relationships among the factors in different layers were analyzed in the simulated experiment of phosphate transferring at sediment-water interface. The dynamics of dissolved oxygen （DO）, conductivity （Cond.）, pH and oxidation reduction potential （ORP） at the different layers of water column and sediment in the simulated system were detected continuously with a set of in- struments such as rhizon soil moisture sampler. The relationships and interactions among the different parameters in the different layers were analyzed. The results indicated that DO concentration in bottom water column was lower than that in middle and upper layers; there were no significant differences among the conductivity of different layers in overlying water and conductivity increased linearly with time; pH dynamics had significant spatial variability in the system, the sediment-water interface was jump point, changes of pH in overlying water lagged behind in the sediment porewater; ORP in the sediment was lower than in overlying water and the sediment-water interface was the jump point. DO concentrations were positively correlated with ORP in upper sediment and every layer in overlying water, but not related to ORP in bottom porewater. The interactions among other parameters were not significant.