巢湖湖滨带生态恢复工程对暴雨径流氮磷削减效果研究

从湖滨带区域环境条件及氮磷输出强度差异出发,探讨湖滨带生态恢复工程对暴雨径流氮磷削减的特征及效果,选取巢湖西北岸湖滨带生态恢复区与原生灌草区内4个典型断面开展暴雨径流氮磷削减的对比试验,研究暴雨期及暴雨间期4个断面氮磷削减效果的差异及原因。结果表明:暴雨期,断面2和断面3对暴雨径流中氮磷去除效果明显,断面2对暴雨径流中氮、磷去除率分别为69%和60%,断面3对暴雨径流中氮、磷去除率分别为60%和58%;暴雨间期,断面2 区域内水体氮磷浓度平均下降67%和63%,断面3则为59%和51%;生态恢复工程去除暴雨径流中氮、磷的效果,与暴雨径流中氮、磷浓度呈显著正相关;断面2对暴雨径流氮磷削减效果最佳。

EFFECT OF NITROGEN AND PHOSPHORUS ON RAINSTORM RUNOFF REDUCTION CUT FROM ECOLOGICAL RESTORATION ENGINEERING OF CHAOHU LAKESIDE ZONE

The characteristics and effects reducing nitrogen and phosphorus of lakeside ecological restoration engineering were explored in this study based on the varieties of environmental conditions and N and P output intensities among the lakeside zones of Chaohu Lake. To detect the difference of N and P reduction between the periods of heavy rain and rainstorm interval, we chose 4 typical sections of ecological restoration area and native shrub grass area in the northwest lakefront of Chaohu Lake. The result showed that section 2 and section 3 had obvious effect on N and P removal. During the heavy rain, the removal efficiency of N and P in section 2 were 69% and 60% and they were 60% and 58% in section 3 respectively;During the rainstorm interval, concentrations of N and P decreased 67% and 63% respectively in section 2 and 59% and 51% in section 3;The effect reducing N and P of ecological restoration engineering was significantly related with the concentrations of N and P in the rainstorm runoff;The section 2 had the best effect on reducing N and P.