京杭大运河(苏州段)内源磷形态分布及其对扰动的响应  

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

作　　者：刘焱见 李大鹏[1] 李鑫[1] 宋小君[1] 韩菲尔 周婧[1] 

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009

出　　处：《环境科学学报》2018年第1期125-132,共8页Acta Scientiae Circumstantiae

基　　金：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,NH_4Cl-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.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.

关 键 词：扰动 内源磷 形态转化 京杭大运河 

分 类 号：X522[环境科学与工程—环境工程]