长江口边滩水库藻类增殖潜力的研究

Study on Algae Proliferation Potential in Yangtze River Estuary Reservoir

从长江口及两个长江口边滩水库(陈行、宝钢水库)采集水样,在实验室内进行了藻类增殖潜力的研究。结果表明,在28℃下直接培养原水样,藻类自然增殖两周后蓝绿藻可成为优势藻种而大量增殖;向灭菌水样中人工接种铜绿微囊藻(其在28℃下长江口水样中的最大现存量可达5.65×106个/mL),其在各水样中的平均比增殖速率为0.22～0.34d-1,倍增周期为2～3d,表明长江口及其边滩水库原水具有较强的藻类增殖潜力。水下光照度是影响长江口边滩水库藻类增殖的重要因素;较长的水力停留时间降低了水体的浊度,提高了水下光照度,为藻类增殖创造了良好的光照条件。

The algae proliferation potential in the water samples collected from Yangtze River estuary and the two estuary reservoirs （Chenhang reservoir and Baogang reservior） were studied in laboratory. The result shows that when the raw water samples are cultivated at 28℃, blue-green algae can become the dominant phytoplankton and proliferate greatly after two weeks. When inoculating Microcystis aeruginosa in the sterilized raw water, the maximum biomass can reach 5.65× 10^6 cells/mL in the water sample from Yangtze River estuary at 28 ℃ The average specific proliferation rate is about 0.22 to 0.34 d^-1, and the doubling period is about 2 to 3 d in each sample. It proves that the raw water in Yangtze River estuary and the two reservoirs has stronger algae proliferation potential. The light density under water is the critical factor that affects the algae proliferation in Yangtze River estuary reservoirs. Long hydraulic retention time may reduce the turbidity of the water and improve the light density under water, providing better light condition for the algae proliferation.