摘要
Abstract
This study was based on the single-time ecological water diversion experiment conducted in shallow lake in November 2024.A monitoring network comprising 8 sampling sites was established,covering both the western and eastern halves of the lake.Key water quality indicators-including transparency(SD),total phosphorus(TP),total nitrogen(TN),chlorophyll-a(Chla),and the permanganate index(IMn)were continuously monitored across 3 phases:pre-diversion,during diversion,and post-diversion.The changes in the trophic level index(TLI)of the lake water before and after the diversion were analyzed.The results showed that during the water diversion period,transparency,total phosphorus,total nitrogen,and chlorophyll-a levels improved temporarily.However,after the water diversion was stopped,except for chlorophyll-a,the other indicators rebounded or remained at high levels,indicating that the improvement in water quality due to water diversion was only short-term.During the diversion,the mean TLI for the entire lake decreased from 59.3 to 50.6(a reduction of 14.7%),with a 19.2%decrease in the western half-lake;however,it rebounded somewhat one week after the diversion ended.In conclusion,ecological water diversion can temporarily suppress algal proliferation and improve water quality,but its sustained effectiveness is limited.It is therefore necessary to combine a"low-flow,high-frequency"water replenishment strategy with sediment dredging for synergistic management.This study provides a reference for eutrophication control and the optimization of ecological water diversion projects in lake regions.关键词
湖泊/生态引水/综合营养状态指数(TLI)/水体富营养化/水质改良Key words
lake/ecological water diversion/trophic level index(TLI)/eutrophication/water quality remediation分类
资源环境
