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| 无机解磷菌对天鹅湖瀉湖沉积物内源磷释放的影响 |
| Effects of inorganic phosphate-solubilizing bacteria on phosphorus release from sediments in Swan Lagoon |
| 投稿时间：2021-11-04 |
| DOI：10.13254/j.jare.2021.0756 |
| 中文关键词: 沉积物，无机解磷菌，磷释放，磷形态，荣成，天鹅湖 |
| 英文关键词: sediment, inorganic phosphate-solubilizing bacteria, phosphorus release, phosphorus form, Rongcheng, Swan Lagoon |
| 基金项目:山东省自然科学基金项目（ZR2021MD109，ZR2018MD018）；国家自然科学基金项目（41273130）；烟台大学研究生科技创新基金项目（YDYB2108） |
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| 中文摘要: |
| 为研究解磷菌对荣成天鹅湖瀉湖沉积物内源磷释放的影响，以前期筛选的3株无机解磷菌和表层沉积物为试验材料进行室内模拟试验，分析了不同解磷菌接种条件下水体总磷及pH、Eh等参数的动态变化，比较了试验前后沉积物各形态无机磷的含量差异。结果表明，在试验前期，各解磷菌处理水体的pH均不同程度下降，其中沉积物灭菌组和非灭菌组分别降至6.46~6.88和6.66~6.78。试验期间各处理水体Eh不断下降，结束时沉积物-水界面呈厌氧状态。灭菌条件下解磷菌的接种明显促进了沉积物磷的释放，试验后期各加菌处理水体的总磷含量远高于对照；未灭菌条件下水体总磷上升较慢且总体水平较低，不同解磷菌处理间差异较小。试验结束时，大部分加菌处理沉积物中HCl-P（钙结合态磷）含量下降了19.92~50.08mg·kg-1，BD-P（可还原态磷）含量下降1.81~4.19mg·kg-1，而NaOH-P（铁铝结合态磷）未下降。研究表明，无机解磷菌的接种可明显降低上覆水pH，从而使得沉积物中HCl-P溶解释放；HCl-P为天鹅湖沉积物磷的主要赋存形态，在解磷菌作用下其对上覆水体磷水平的潜在贡献不容忽视。 |
| 英文摘要: |
| To examine the effect of inorganic phosphate-solubilizing bacteria（IPB）on phosphorus release from sediment in the Swan Lagoon in Rongcheng, an indoor simulation test was performed with three IPB strains and surface sediments. Changes in total phosphorus （TP）concentration, pH, and oxidation/reduction potential in the overlying water under different IPB inoculation conditions were analyzed. In addition, the concentrations of different forms of inorganic phosphorus in the sediments were determined after the experiment. During the early stage of the experiment, the pH value of the water decreased following inoculation with IPB; The pH of the sterilized sediment and non-sterilized sediment groups decreased to 6.46-6.88 and 6.66-6.78, respectively. The water oxidation/reduction potential in the different treatments decreased continuously over time, and the sediment-water interface became anaerobic. In the sterilized group, inoculation with IPB significantly promoted the release of phosphorus from the sediments. At the later stage, the water total phosphorous concentrations in the inoculation treatments were much higher than that of the control. In the non-sterilized group, TP concentrations increased slowly over time with a small difference observed among the different IPB treatments. At the end of the experiment, the concentrations of HCl-P in most sediments inoculated with IPB had clearly decreased by 19.92-50.08 mg·kg-1, and the BD-P concentrations decreased by 1.81-4.19mg·kg-1. However, the NaOH-P concentration did not decrease. The results indicate that inoculation of IPB can greatly reduce the pH of water, leading to the dissolution and release of HCl-P from sediment. In Swan Lagoon, HCl-P is the main form of phosphorus in the sediment as produced via the action of IPB, indicating its strong effects on the phosphorus level in the overlying water. |
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