摘要
从长江口及两个长江口边滩水库(陈行水库和宝钢水库)采集水样,在人工气候室内进行了藻类增殖潜力研究。结果表明,在完全不添加营养成分的前提下,在培养未灭菌水样时蓝绿藻可成为优势种而大量增殖;在灭菌水样中人工接种铜绿微囊藻时,该藻的藻细胞数最大现存量可达5.65×106个/mL。另一方面,采用遮光控藻思路,在上海交通大学致远湖中设置软体浮式人工围隔,待其发生水华后将围隔遮光,7d后叶绿素a从发生水华时的176.9μg/L降至21.4μg/L。因此,使用遮光技术可以达到有效控藻的目的。
The algae growth in three water samples, collected from Changjiang estuary and two estuary reservoirs （Chenhang Reservoir and Baogang Reservior）, were studied in a climate controlled lab chamber. Without adding N/P nutrients, blue-green algae reproduced quickly and became the dominant phytoplankton in the raw water samples. The maximum algae density in the sterilized samples was 5.65× 10^6 cells/mL at 28 ℃（12 days after inoculation of Microcystis aeruginosa ） demonstrating high algae growth potentials of the three source waters. After an algae outbreak was induced （by adding N/P nutrients） in two mesoeosms （1.2 m× 1.2 m, 1.4 m deep） on Lake Zhiyuan of Shanghai Jiaotong University; a black PE sheet was employed to cover one of them to determined the effectiveness of light shading for algae control. Shading was highly effective for algae control; the Chl-a concentration of the shaded mesocosm declined to 21.4 μg/L（from 176.9 μg/L） in 7 days. The shading reduced the light intensity of the water body and thus slowed down the photosynthesis. At a light intensity of 400 lx, which was measured at about 0.30 m deep of the covered water at noon, the photosynthesis of new algae was equal to the respiration loss.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第11期805-808,共4页
Environmental Pollution & Control
基金
科技部"973"项目(No.2002CB412409)
上海市科学技术委员会重大科技攻关项目(No.04DZ12030-2)
关键词
长江
边滩水库
富营养化
光照强度
围隔遮光
Changjiang Reservoir Eutrophication Light intensity Shading Algae control
