扰动方式对湖泊营养盐及藻类生物量影响的模拟研究

    Effects of Disturbance Modes on Lacustrine Nutrients and Algal Biomass: An Experiment Study

    • 摘要: 为探讨扰动方式对湖泊营养盐及蓝藻水华的影响,于2018年7月进行了19 d的室内模拟风浪扰动实验。研究结果显示,不扰动、间歇扰动和持续扰动3种处理方式下TN、TP和TDP浓度均随实验时间呈下降趋势。间歇扰动的TN浓度减少最多,对照组与间歇扰动组、持续扰动组之间TN浓度存在显著性差异(P < 0.05)。TDP浓度减少幅度从大到小依次为间歇扰动组、对照组和持续扰动组,且间歇扰动组与持续扰动组之间TDP浓度存在显著性差异(P < 0.05)。实验结束时,对照组、间歇扰动组和持续扰动组的ρ(叶绿素)分别为251.8、136.2和327.6 μg·L-1,对照组与间歇扰动组、持续扰动组之间ρ(叶绿素)存在显著差异(P < 0.05)。间歇扰动有利于水体中氮的去除,适宜强度的持续扰动增加了叶绿素浓度,促进了藻类生物量的累积和蓝藻水华的暴发。

       

      Abstract: To understand the effect of disturbance modes on lacustrine nutrients and cyanobacterial blooms, an indoor simulative mixing experiment was conducted in July 2018 for 19 days. Results show that TN, TP and TDP concentrations decreased in the control group, intermittent disturbance group and continuous disturbance group. The concentrations of TN in the intermittent disturbance group showed the sharpest decline, and concentrations of TN differed significantly (P < 0.05) among the three treatments. During the period of the experiment, the highest, medium and lowest mean values of TDP concentration were observed in the intermittent disturbance group, the control group and the continuous disturbance group, respectively. There were significant differences in TDP concentration between the intermittent disturbance and continuous disturbance groups (P < 0.05). At the end of the experiment, the concentrations of Chl-a in the control group, intermittent disturbance group and continuous disturbance group were 251.8, 136.2 and 327.6 μg·L-1, respectively. Concentrations of Chl-a differed significantly (P < 0.05) among the three treatments. These results indicate that intermittent disturbance was conducive to nitrogen removal from lakes. Continuous disturbance at appropriate intensities may significantly increase Chl-a concentrations, thus benefitting algal accumulation and cyanobacterial blooms.

       

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