微生物对阳澄湖间隙水溶解活性磷释放的影响

Impact of Microbe on Release of Soluble Reactive Phosphorus from Sediments of Yangchenghu Lake

为揭示微生物对阳澄湖沉积物溶解活性磷释放的影响,取江苏省阳澄湖表层沉积物,设置对照组和抑菌组连续进行11d的沉积物柱样室内培养试验。利用微电极和高分辨率Peeper技术,获取两组柱样高分辨率溶解氧DO、氧化还原电位Eh和溶解活性磷垂向分布情况,并分级提取柱样磷形态。结果表明,抑菌组沉积物DO、Eh垂向分布明显高于对照组;外加抑菌剂显著降低了间隙水溶解活性磷(SRP)浓度(P<0.001),抑菌组间隙水SRP浓度约为对照组的一半;抑菌组结合态磷的含量较对照组有所增加,NaOH-P与BD-P含量的增量是总增量的主要部分,这两种形态的磷含量的变化与微生物活性相关。研究结果有助于揭示阳澄湖沉积物溶解活性磷释放机理。

The impacts of restraining microbial activity on the soluble reactive phosphorus（SRP）in sediments of Yangchenghu Lake were investigated through sediments incubation with two groups of treatment（control group,antibiotics group for 11days）.Microelectrode and high-resolution dialysis（HR-Peeper）were applied to obtain vertical distribution of DO,Eh and SRP at a millimeter resolution.Meanwhile the fractionation of phosphorus was extracted.The results show that the vertical distribution of DO and Eh in antibiotics group is higher than that of control group.The concentration of SRP in the sediments was decreased by the additional agent（P〈0.001）,and the antibiotics decreased the concentration of SRP by up to half of the control group.The content of each bound phosphorus was increased by antibiotics in sediments.The contents of NaOH-P and BD-P increments were the main parts of the total increments.The change of the contents of two phosphorus forms may be associated with microbial activity.The results help to reveal the SRP release mechanism of Yangchenghu Lake.