小型湖泊修复区与未修复区对生态修复的响应与评价

为研究湖泊生态修复后小型城市湖泊不同区域水生态状况的长期响应特征,并探讨利用不同水生生物类群评价水体水生态状况的适用性,于2018年1月～2019年5月,对湖南小型城市湖泊松雅湖水质及不同水生生物类群分别进行了逐月和季度监测,并对其水生态状况进行了评价.结果显示,与生态修复之前相比,修复后松雅湖全湖相关水质指标均优于修...

Responses and assessment of water ecological state in restored and unrestored areas of a small urban lake after ecological restoration

This research aims to study the long-term variations on aquatic ecological state in different regions of a small urban lake after ecological restoration, and the applicability of using different aquatic organisms to evaluate water ecological state, the water quality and different aquatic communities in Songya Lake, a small urban lake in Hunan Province, this monitoring was performance monthly and quarterly from January 2018 to May 2019, and the water ecological state was evaluated. After restoration, the results showed that the water ecological status of the whole lake was better than that of before restoration. The decrease rates of Chl-a and COD_Mn were nearly to 90%, and for TP it was more than 70%. The concentrations of TN, NH₃-N and TP in the restored area and the un-restored area, all showed a decreasing trend, and the others water quality indexes were also at a low level with relatively small variation during the survey; However, most of the indexes were better in the restored area. The higher contents of COD_Mn in the restored area were probably related to the exogenous input and more submerged plant residues. In addition, the numbers of species and biodiversity indexes of phytoplankton, zooplankton and zoobenthos in the restoration area were higher than those in the un-restored area, and the densities of phytoplankton and zooplankton were also higher than those in the un-restored area. The evaluated results of water ecology showed that the restored area and the un-restored area performed well in most of the time. Among the different biological indexes, the zooplankton species indicators were the most accurate in Songya Lake, this finding suggested that in order to use a single aquatic biota to evaluate the water ecological state of the water body, an appropriate biota should be selected for this evaluation according to the characteristics of the water environment and the objectives pursued.