摘要
江苏吴江同里国家湿地公园在其合理利用区设计并联交叉水系,使行船河道与不行船河道并联且保持水体交换,辅以河道清淤以控制水体富营养化。为研究并联水系、行船控制及清淤工程的生态效应,2016年12月和2017年4月分别选取研究地互相连通的行船河道与不行船河道,在清淤段、未清淤段采集水样,比较行船控制及清淤的水质差异,为小型河道的生态修复与合理利用提供技术参考。结果发现12月和4月行船河道水体TP浓度均略高于相应的不行船河道,而在12月行船河道TN浓度略低于不行船河道,在4月行船河道TN浓度却略高于不行船河道。在12月和4月行船河道清淤段TN、NH^+4-N、NO^-3-N浓度均低于未清淤段,而在4月清淤段TP浓度低于未清淤段,在12月清淤段TP浓度高于未清淤段;在2个时段,不行船河道清淤段NH^+4-N、NO^-3-N浓度也低于未清淤段,但清淤段水体TP浓度高于未清淤段。并联交叉水系及行船控制可增加不同河段间水体水质的异质性,促进营养元素在不同河道间的转移与再分配;在人为扰动较大的行船河道,清淤有较显著的水质改善效果,但在人为扰动较小的不行船河道,不清淤更有利于水体中TP保持较低浓度。
Crossed parallel water system(CPWS)and dredging have been implemented to control eutrophication in small rivers in Tongli National Wetland Park.In the CPWS,water exchange can be maintained;boating is allowed in one river but not in the parallel river.To study the effects of CPWS,boating control and dredging,water samples were collected from dredged and undredged sections in the CPWS to analyze the effects of boating and dredging on water quality in December,2016 and April,2017.The obtained research results may be taken as technical references for the ecological restoration and rational use of small rivers.First,compared with rivers without boating,the concentration of TP in boating rivers was higher,but the concentration of TN in boating rivers was relatively lower in December and was higher in April.Second,in the boating rivers,the concentrations of TN,NH^+4-N and NO^-3-N were lower in the dredging sections than those in the undredged sections in December and April while the concentration of TP was also lower in April but higher in December in the dredging sections.In the dredged sections of rivers without boating the concentrations of NH^+4-N and NO^-3-N were lower but the concentration of TP was higher in both December and April.Our study showed that the design of crossed parallel water system could increase the heterogeneity of water quality and promote the transfer and redistribution of nutrients among rivers.Dredging was effective in improving water quality under relatively strong disturbance.No dredging was of great help to keep the concentration of TN low in water when disturbance was weak.
作者
顾艳
丁丽花
黄和
肖孟阳
刘茂松
GU Yan;DING Li-hua;HUANG He(School of Life Sciences,Nanjing University,Nanjing,Jiangsu 210023;Jiangsu Tongli National Wetland Park,Suzhou,Jiangsu 215216)
出处
《安徽农业科学》
CAS
2020年第1期65-69,共5页
Journal of Anhui Agricultural Sciences
基金
国家重点研发计划(2017YFC05062)
国家自然科学基金项目(31770512)
关键词
富营养化
并联交叉水系
扰动
生态修复
Eutrophication
Crossed parallel water system
Disturbance
Ecological restoration
