| 引水对梅梁湾水质及浮游藻类影响的模拟研究 |
| Effects of Simulated Water Diversion on the Water Quality and Phytoplankton Community in Meiliang Bay |
| 投稿时间：2015-02-09 修订日期：2015-07-08 |
| DOI：10.15928/j.1674-3075.2015.04.006 |
| 中文关键词:调水引流 微宇宙水生态模型 藻类群落 环境因子 |
| 英文关键词:water diversion microcosm model of aquatic ecosystem phytoplankton community environmental factors |
| 基金项目:国家水体污染控制与治理科技重大专项项目（2012ZX07506-003-04）；水利部公益性行业科研专项经费项目（201301041）；国家国际科技合作专项（2015DFA01000）；国家自然科学基金项目（51309156）；江苏省自然科学基金项目（BK20141075）；中国博士后科学基金项目（2014M561687）。 |
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| 中文摘要: |
| 以望虞河“引江济太”工程为背景，通过为期30 d的受水水体为15L的室内微宇宙水生态模拟实验，模拟研究了望虞河水3组（T1、T2、T3）不同引水流量（432 mL/d、864 mL/d、1 728 mL/d）影响下，太湖梅梁湾富营养化水体理化性质与浮游藻类群落的动态响应过程。受水水体理化参数的重复测量方差分析表明，3种流量的引水均能不同程度地促进受水水体复氧，降低水体营养盐浓度，流量越大改善作用越明显。在静水条件下，实验受水水体的浮游藻类以微囊藻为主（88.9%～100%）；而1 728 mL/d流量引水处理组中，微囊藻的比例（21.1%）在第15天显著下降，微囊藻细胞的密度也较对照组和其它流量组有显著降低。浮游藻类群落结构与受水水体理化参数的RDA分析表明，受水水体SRP（P =0.002）、浊度（P =0.002）、DO（P =0.026）、NO3-N（P =0.034）与不同流量组藻类群落的差异与变动显著相关。引水主要导致受水水体SRP、浊度、DO、NO3-N含量的变化，进而驱动了藻类群落结构的动态变化。DO、浊度、NO3-N与SRP等环境因子成为影响受水湖泊浮游藻类群落特征变化的重要因素。 |
| 英文摘要: |
| Taihu Lake is a large shallow lake and has developed severe eutrophication, including massive cyanobacteria blooms. The “water diversion from Yangtze River to Taihu Lake” project is a long-term effort to improve water quality in the Taihu River basin , and has important influence on algal biomass, water quality and hydrology of the Taihu Lake by different water flow rates, the frequency of water diversion and the carrying nutrients of inflow waters .The objective of this investigation was to begin optimizing water flow in order to maximize the benefit of the water diversion project. Because of the variability of water flow in the Taihu basin, it is difficult to evaluate the ecological effects of a given flow on water quality at the field level. To begin predicting the effect of flow on water quality in Taihu Lake, we designed an indoor simulation study using a 15 L microcosm model filled with eutrophic water. Under controlled conditions, the dynamic response of physicochemical parameters and the phytoplankton community was carefully studied for 30 days. Flow through the microcosm was maintained with water from Wangyu River at three rates; T1=432 mL/d, T2=864 mL/d and T3=1 728 mL/d. Repeated measurements and analysis of variance showed that all three flow rates promote reaeration and reduce nutrient concentrations, but to different levels;the greater the flow, the more obvious the improvement. In the control (static water conditions), the phytoplankton community was dominated by Microcystis (88.9%-100%). However, Microcystis domination declined significantly (21.1%) by day 15 in the T3 group. Canonical Correspondence Analysis gave significant correlation between phytoplankton community structure and soluble reactive phosphate (P=0.002), turbidity (P=0.002), dissolved oxygen (P=0.026) and nitrate (P=0.034). The results of this study demonstrate that increasing dissolved oxygen and turbidity while decreasing nitrate and soluble reactive phosphate will reduce overall cell density and the relative proportion of Microcystis in the phytoplankton community. |
| 杨倩倩,吴时强,吴修锋,周杰,戴江玉,吕学研.2015.引水对梅梁湾水质及浮游藻类影响的模拟研究[J].水生态学杂志,36(4):42-49. |
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