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研究报告

Distribution of internal phosphorus and its response to disturbance in the Beijing-Hangzhou Grand Canal (Suzhou section)

基金项目：国家自然科学基金（No.51278523，51778393）；江苏省"六大人才高峰"项目（No.2013-JNHB-022）；水处理技术与材料协同创新中心项目

摘要：以京杭大运河（苏州段）不同外源汇入断面的沉积物和上覆水为实验材料，研究了扰动条件下上覆水、沉积物中不同形态磷数量分布及形态转化过程.结果表明，污水厂尾水排放口处的沉积物内源磷更容易释放，且扰动期间上覆水中不同形态磷（TP、PP、DTP、DIP）均处于较高水平，明显高于风景区和居民区，此外，也归因于水丝蚓的生物扰动.但随着扰动次数的增加，上覆水中各形态磷含量呈降低趋势.扰动显著改变了上覆水中形态磷分布规律，DIP/DTP、DIP/TP及DIP/DTP比值呈降低趋势，并在第11 d以后趋于稳定，但在有水丝蚓扰动下，改变幅度变小.扰动导致沉积物中不同形态磷含量发生变化，NH₄Cl-P含量明显降低，Fe/Al-P明显增加，其中，污水厂尾水排放口沉积物中NH₄Cl-P和Fe/Al-P的变化幅度最大.

Abstract：The distribution and transformation of different phosphorus (P) forms in the overlying water and sediments were investigated under disturbance. The sediments and overlying water were taken from Beijing-Hangzhou Grand Canal (Suzhou section) at the different crosses with the external P input. The results show that the sedimentary P at the cross with the effluence from the wastewater treatment plant released more easily, and the concentrations of P forms (TP、PP、DTP、DIP) in the overlying water were at a higher level, compared with the other crosses, such as the scenic areas and residential areas. Noticeably, the benthos disturbance was another explanation. However, the content of the P forms decreased with the increase of the disturbance. In addition, the disturbance changed the distribution of the P forms in the overlying water. The ratio of the DIP/DTP, DIP/TP and DIP/DTP decreased and kept stable from day 11. There is an exception when Limnodrilus hoffm eisteri.are present, resulting in the smaller change of those ratios. The concentrations of the sedimentary P forms varied due to the disturbance. The NH₄Cl-P decreased and the Fe/Al-P increased obviously. The change of the NH₄Cl-P and Fe/Al-P at the cross with the effluence from the wastewater treatment plant was higher, compared with the other crosses.

Key words：disturbance internal phosphorus form transformation Beijing-Hangzhou Grand Canal