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引用本文:赵林林,朱梦圆,冯龙庆,刘笑菡,朱广伟,陈元芳,秦伯强.太湖水体理化指标在夏季短时间尺度上的分层及其控制因素.湖泊科学,2011,23(4):649-656. DOI:10.18307/2011.0423
ZHAO Linlin,ZHU Mengyuan,FENG Longqing,LIU Xiaohan,ZHU Guangwei,CHEN Yuanfang,QIN Boqiang.Stratification and its driving factors of water physicochemical variables in large,shallow Lake Taihu. J. Lake Sci.2011,23(4):649-656. DOI:10.18307/2011.0423
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太湖水体理化指标在夏季短时间尺度上的分层及其控制因素
赵林林1,2, 朱梦圆2, 冯龙庆3, 刘笑菡2, 朱广伟2, 陈元芳1, 秦伯强2
1.河海大学水文水资源学院, 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;3.南京农业大学资源与环境学院, 南京 210095
摘要:
通过连续9d(2010年7月24日至2010年8月1日)对太湖水体理化指标垂向分层的高频率观测, 揭示太湖多指标垂向分层规律.观测表明:(1)太湖中各水质指标频繁出现分层现象, 但不稳定;(2)分层的主要控制因素包含气温的日变化、蓝藻水华堆积与风浪扰动等;(3)气温和太阳辐射日变化影响水温分层, 水温垂向变幅可达3.94℃, 进而影响其他水质理化指标分层;(4)蓝藻水华堆积是影响水体理化指标垂向分层最强烈的因子, 堆积发生时水体各理化指标垂向分层明显, 垂向变幅溶氧达8.67mg/L, 溶解氧饱和度达122.8%, 电导率达48μC/cm, pH达1.49, 叶绿素达9.1μg/L, 浊度达26.5NTU;(5)随着风速的增加, 除浊度外其他指标分层明显减弱, 在大风期水体理化指标基本无分层现象, 小风期则容易形成分层, 但对分层的影响程度小于蓝藻水华堆积.研究表明, 尽管太湖是大型浅水湖泊, 长时间的分层不会形成, 但是水体各理化指标昼夜或1-2d的短时期尺度垂向分层现象经常出现, 对水生物、水气界面和水土界面物质交换的影响不容忽视, 在湖泊水质高频观测等调查方案设计中应充分考虑。
关键词:  浅水湖泊  水体理化指标  垂向分层  蓝藻水华  风浪扰动
DOI:10.18307/2011.0423
分类号:
基金项目:中国科学院知识创新工程重大交叉项目(KXCX1-YW-14);国家自然科学基金重点项目(40730529);美国国家自然科学基金项目(DBI-0639229)联合资助
Stratification and its driving factors of water physicochemical variables in large,shallow Lake Taihu
ZHAO Linlin1,2, ZHU Mengyuan2, FENG Longqing3, LIU Xiaohan2, ZHU Guangwei2, CHEN Yuanfang1, QIN Boqiang2
1.College of Hydrology and Water Resources, 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;3.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, P.R.China
Abstract:
A nine-day observation on the process of vertical stratification of physicochemical variables was taken from 24th July to 1st August, 2010 in Lake Taihu,a large shallow lake of China.Frequent stratification processes occurred during the 9 days.But the stratifying state was unstable,and normally last less than 1 day.The main factors causing stratification were water temperature and its diel variation, cyanobacterial bloom scum and wind-induced wave disturbance.The vertical difference of water temperature-may reached 3.94℃,which was mainly influenced by diel variation of air temperature and solar radiation.And the stratification of water temperature was the basic factor causing the stratification of dissolved oxygen,electric conductivity,and pH.Cyanobacterial bloom scum could cause the strongest stratification, which could cause vertical difference of 8.67mg/L of dissolved oxygen, 48μC/cm of electric conductivity, 1.49 of pH, 9.1μg/L of chlorophyll-a and 26.5NTU of turbidity.Besides turbidity,stratification of physicochemical variables became weaker with the increase of wind speed.No stratification happened during strong wind period in which of wind speed over 6m/s,while it often happened during weak condition in which of wind speed less than 2m/s.The study indicated that,stratification processes could frequently short-term occurred in large shallow lakes,and might have potential influences on the processes of biological activities and exchange on air-water interface and water-sediment interface.
Key words:  Shallow lakes  physicochemical variables  stratification  cyanobacterial bloom  wind-induced wave disturbance
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