| 扰动对悬浮颗粒物粒径及上覆水中磷形态分布的影响 |
| 摘要点击 2605 全文点击 1280 投稿时间：2015-09-07 修订日期：2015-11-13 |
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| 中文关键词 太湖 上覆水 底泥扰动 粒径 磷形态 |
| 英文关键词 Taihu Lake overlying water sediment disturbance particle size phosphorus |
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| 中文摘要 |
| 为了探讨底泥扰动下上覆水中悬浮物粒径分布规律及该分布规律对水体中溶解性形态磷的影响,以太湖梅梁湾上覆水和沉积物作为实验对象,开展室内模拟实验. 结合乌氏粒级标准分析了扰动下的水体中粒径变化情况以及上覆水中不同磷形态的变化规律. 结果表明,扰动后的水体中,悬浮物粒径分布发生明显变化,其中小粒径颗粒(0~10 μm)、中粒径颗粒(10~20 μm)、大粒径颗粒(≥20 μm)的平均占比分别升高、降低、不变. 说明中小粒径颗粒物质有向大粒径转化的趋势. 另外,在磷形态方面,随着粒径分布的周期性变化,DTP/TP、DIP/TP存在同样的周期性上升规律,数据显示DTP、DIP的变化并不明显,这说明扰动导致悬浮颗粒物对于磷的持留能力提高. 另一方面,扰动下 DTP/TP和DIP/TP平均值分别为19%和13%,其远低于对照实验(80%和69%),说明扰动引起的小粒径聚集与絮凝成大粒径颗粒的现象有利于上覆水中溶解性形态磷的吸附与沉降,并转化成颗粒态磷,进而延缓水体富营养化的发展进程. |
| 英文摘要 |
| To clarify the influence of the sediments disturbance on the particle size distribution of suspended solids, and the influence of particle distribution on the forms of dissolved phosphorous in the overlaying water, the sediments and overlying water from Meiliang Bay, Taihu Lake, were used to conduct the indoor simulation experiments to investigate the particle size of suspended solids according to the Ubbelohde particle size criteria and the distribution of phosphorus compounds in the overlying water under the disturbance circumstances. The results indicated that the average proportions of small (0-10 μm), middle (10-20 μm) and large (≥20 μm) diameter particles presented different trends of increasing, decreasing and staying stable, respectively. It indicated the possible transformation of particle size of suspended solids from small-middle diameter to large diameter. In addition, the data of DTP/TP and DIP/TP showed a periodical variation with the corresponding periodical variety of particle diameter in suspended solids, while no obvious variety of DTP and DIP was observed. It suggested that disturbance enhanced the ability of phosphorus immobilization by suspended solids. On the other hand, the percentages of DTP in TP and DIP in TP were 19% and 13% under the disturbance, respectively, and they were obviously lower than those (DTP/TP, 80% and DIP/TP, 69%) in the control. It indicated that the transformation of particle size of suspended solids from small-middle diameter to large diameter due to disturbance was in favor of the adsorption and sedimentation of dissolved phosphorus. Accordingly, the formation of particle phosphorus was enhanced. Therefore, it delayed the development of eutrophication in the water body. |
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