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引用本文:谭啸,孙玉童,段志鹏,曾庆飞,郑雪莹,刘倩倩.不同超声强度下微囊藻群体沉降及其上浮过程对光照和温度的响应.湖泊科学,2017,29(5):1168-1176. DOI:10.18307/2017.0514
TAN Xiao,SUN Yutong,DUAN Zhipeng,ZENG Qingfei,ZHENG Xueying,LIU Qianqian.Influence of ultrasonic intensity on sinking of Microcystis colonies and their floating process under different light and temperature conditions. J. Lake Sci.2017,29(5):1168-1176. DOI:10.18307/2017.0514
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不同超声强度下微囊藻群体沉降及其上浮过程对光照和温度的响应
谭啸1, 孙玉童1, 段志鹏1, 曾庆飞2, 郑雪莹1, 刘倩倩1
1.河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 河海大学环境学院, 南京 210098;2.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
摘要:
以太湖微囊藻群体为研究对象,研究低频超声作用下,4种超声强度和不同处理时间对微囊藻群体的抑制效应,试图得出最优超声参数,同时探讨超声处理后的微囊藻群体对光照和温度的响应.结果表明,当超声强度为0.0353 W/cm3、处理时间为60 s时,藻细胞沉降量高达80%,且此时藻细胞浓度和叶绿素a浓度均保持不变,表明超声未破碎藻细胞,细胞内含物不会泄漏污染水质,因此作为最优超声参数.随后,对超声处理后的微囊藻群体在不同光照和温度条件下进行恢复培养,结果表明光照和温度均能影响微囊藻群体的浮力恢复,但光照的影响更明显,当光照度为2000 lx时,藻细胞在培养120 h后漂浮率恢复至对照组水平.超声后的藻细胞在较低温度(≤ 20℃)下漂浮率无显著变化,而在较高温度(25℃)下,培养72 h后漂浮率迅速升高,至120 h能恢复至对照组水平的80%左右.因此,野外超声控藻应选择低光强、低温的时段,采用间歇式多次处理,抑制微囊藻群体上浮,使其彻底沉降.
关键词:  微囊藻群体  超声强度  超声时间  沉降  漂浮率  光照  温度  太湖
DOI:10.18307/2017.0514
分类号:
基金项目:国家自然科学基金项目(31470507)、中央高校科研业务费项目(2013B32414)和江苏省优势学科平台项目(PAPD)联合资助.
Influence of ultrasonic intensity on sinking of Microcystis colonies and their floating process under different light and temperature conditions
TAN Xiao1, SUN Yutong1, DUAN Zhipeng1, ZENG Qingfei2, ZHENG Xueying1, LIU Qianqian1
1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
Inhibition effect of different ultrasonic intensities was investigated by using Microcystis colonies from Lake Taihu,and the aim of this study was to obtain the optimal ultrasound parameters.The floating character of Microcystis colonies after sonication was cultured under different illumination intensity and temperature conditions.Results showed that sonication for 60 s at 0.0353 W/cm3 was an optimal parameter,which led to an immediate sedimentation (up to 80%) markedly.In the experiment,the algal cell con-centration and chlorophyll-a concentration were unchanged,which suggested that algal cells remained intact and cell inclusions did not leak to contaminate water quality.Light and temperature played important roles in the floating process of Microcystis colonies,but light was a more significant factor during the process.Under 2000 lx at 25℃,the floating rate of algal cells could restore to the normal level after 120 h,while the floating rate of algal cells after sonication did not change significantly at a relatively low temper-ature (≤ 20℃).In comparison,at a higher temperature of 25℃,the floating rate increased after 72 h which could restore to 80% of the level in control group after 120 h.Therefore,the ultrasonic control of algal blooms in lakes should choose a weak illumination intensity and low temperature condition.
Key words:  Microcystis colonies  ultrasonic intensity  exposure time  sedimentation  floating rate  illumination  temperature  Lake Taihu
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