模拟环境因子对输水明渠泥线藻生长及光合活性的影响

ENVIRONMENTAL EFFECTS ON THE GROWTH AND PHOTOSYNTHETIC ACTIVITY OF LASPINEMA SP.IN SIMULATED WATER CONVEYANCE OPEN CHANNEL

为了解输水明渠有害附着蓝藻的生理生态适应性,在室内使用小型跑道池模拟输水明渠环境,选取丝状着生蓝藻泥线藻(Laspinema sp.APE171)为研究对象,在不同流速、光照强度、UV-A强度、浊度环境条件下,测定泥线藻的叶绿素a含量和叶绿素荧光等参数,并对比了泥线藻在水-气界面和底栖两种不同生境中的生理状态差异。结果显示:当流速V>0.23 m/s时,水-气界面处的泥线藻生长被抑制;UV-A强度为440μW/m^(2)时,会对水-气界面处的泥线藻光合作用产生明显胁迫;浊度为100 NUT时,水-气界面处的泥线藻光合活性最低;泥线藻在水-气界面生境中对环境因子的变化更敏感。因此在对输水明渠中泥线藻的监测和防控过程中,应充分考虑流速、UV-A强度、浊度及不同生境对其生长的影响。

In order to explore the physiological and ecological adaptability of harmful periphytic algae in water conveyance open channels,a small runway pool was used indoors to simulate the environment.Specifically,periphytic algae(Laspinema sp.APE171)were selected.The chlorophyll a content and chlorophyll fluorescence parameters of Laspinema sp.APE171 were selected for examination.The study assessed the chlorophyll a content and chlorophyll fluorescence parameters of Laspinema sp.APE171 under different environmental conditions such as flow rate,light intensity,UV-A intensity,and turbidity.Furthermore,distinctions in the physiological state of Laspinema sp.APE171 in the water-air interface and benthic habitats were compared.The results showed that when the flow rate V>0.23 m/s,the growth of Laspinema sp.APE171 was inhibited in the water-air interface habitat.Moreover,UV-A intensity at 440μW/m^(2) induced stress on the photosynthesis of Laspinema sp.APE171 in water-air interface habitat.Additionally,when the turbidity was 100 NUT,the photosynthetic activity of Laspinema sp.APE171 in the water-air interface habitat was the lowest,and Laspinema sp.APE171 was more sensitive to changes of environmental factors in the water-air interface habitat.Therefore,the effects of flow velocity,UV-A intensity,and turbidity on cyanobacterial growth in different habitats necessitate thorough consideration in the monitoring and management strategies aimed at controlling Laspinema sp.in open water conveyance channels.