|DING Ruirui,GUO Nichun,MA Youhua.Effects of sediment dredging on crustacean zooplankton community of Shuangqiao River in Chaohu Basin. J. Lake Sci.2019,31(3):714-723. DOI:10.18307/2019.0310
|为研究河流底泥疏浚工程对富营养化河流水生生态系统的影响，选取巢湖双桥河开展为期一年的河流生态监测与调查，对比分析了巢湖双桥河疏浚前和疏浚后的水质指标、浮游甲壳动物群落结构及生物多样性指数.研究发现：底泥疏浚后双桥河水质得到明显改善，其中氮、磷营养盐分别削减48.09%和19.09%；底泥疏浚对浮游甲壳动物群落结构影响显著，疏浚后浮游甲壳动物生物量从1.86 mg/L下降到0.25 mg/L，下降了86.40%；疏浚后生物多样性指数高于疏浚前，且受季节影响较大；浮游甲壳动物与水环境因子相关性研究发现：pH、温度、铵态氮、硝态氮、可溶性氮、总氮和氮磷比对浮游甲壳动物总生物量均有极显著影响.研究结果表明，河流底泥疏浚工程能显著削减水体中氮、磷营养盐，并从一定程度上改善河流浮游甲壳动物群落结构，促进河流水生生态系统向健康、安全的方向发展.因此，对于双桥河这种受城市外源污染影响较大的城市污染型河流，在削减外源营养盐特别是氮输入的条件下，实施底泥疏浚工程可以促进其水生生态系统的修复.
|关键词: 双桥河 底泥疏浚 水质指标 浮游甲壳动物 群落结构 生物多样性指数
|Effects of sediment dredging on crustacean zooplankton community of Shuangqiao River in Chaohu Basin
DING Ruirui1, GUO Nichun1, MA Youhua2
1.College of Resources and Environment, Anhui Agricultural University, Hefei 230036, P.R.China;2.New Rural Development Research Institute, Anhui Agricultural University, Hefei 230036, P.R.China
|The effects of sediment dredging events on the aquatic ecosystem of Shuangqiao River in Chaohu Basin were researched in the present study, a one-year investigation on the aquatic ecosystem operated in the river. The water quality, the crustacean zooplankton community and the biodiversity index were compared and analyzed pre-with post-dredging. Our results indicated that:The sediment dredging events improved the water quality of Shuangqiao River significantly, and the concentration of nitrogen (N)and phosphorus (P)decreased by 48.09% and 19.09%, respectively. The sediment dredging events had a significant influence on the crustacean zooplankton community, the biomass of crustacean zooplankton decreased from 1.86 mg/L to 0.25 mg/L, which declined by 86.40%. The biodiversity index was mainly affected by sediment dredging and season. There's significant relationships between crustacean zooplankton and environment factors:pH, temperature, ammonium, nitrate, total dissolved nitrogen, total nitrogen and nitrogen:phosphorus ratio were positive to the biomass of crustacean zooplankton. Our results suggested that the sediment dredging would reduce the internal nutrients of river significantly. Furthermore, the sediment dredging events had a significant effect on the crustacean zooplankton community. The aquatic ecosystems of river would be healthy and safety by the operation of sediment dredging. Therefore, the sediment dredging would be beneficial for the aquatic ecosystem, while the eutrophication management of river was not only attribute to the removal of urban external pollution, but also to the exogenous pollution, especially for the reduction of N input.
|Key words: Shuangqiao River sediment dredging events water quality crustacean zooplankton community structure biodiversity index