摘要
太湖是一个典型的大型浅水湖泊,在季风影响下,常年受风浪扰动影响。为了解风浪扰动对太湖水体中微囊藻释放藻毒素(MC)的影响,于2018年7月采集含有微囊藻水华的太湖原水,在中国科学院太湖湖泊生态系统研究站设置了对照、间歇扰动和持续扰动3种处理方式来进行模拟实验,研究水体中藻毒素的变化,实验共持续19 d。结果表明:3种处理方式下,MC浓度的变化趋势一致,1~13 d呈升高趋势,其后均有不同幅度的下降;对照组MC浓度最低,平均值为1.69μg·L-1,显著低于间歇扰动组和持续扰动组(P<0.05);间歇扰动组和持续扰动组MC均值分别为1.81和1.86μg·L-1,两者差异不显著;3种处理方式下,单位藻细胞MC含量1~7 d持续减小,且各组间差异不显著(P>0.05);10~19 d各组均有一个先增加后减小的过程,且组间差异均显著(P<0.05),对照组、间歇扰动组和持续扰动组单位藻细胞MC含量均值分别为0.55、1.20和1.98μg·108cells-1;本实验条件下MC与氮磷等因子显著负相关,与水温、SS、Chla等之间显著正相关。本研究表明,扰动可促进水体中藻毒素浓度及单位藻细胞藻毒素含量的升高。
Taihu Lake is a typical shallow large lake,which is disturbed by wind wave all the year round due to the monsoon.To understand the effect of disturbance from wind and wave on the release of microcystin(MC)by Microcystis spp.in Taihu Lake,water samples containing Microcystis bloom were collected in July 2018.Three treatments including control,intermittent disturbance and continuous disturbance were set up at Taihu Laboratory for Lake Ecosystem Research,Chinese Academy of Sciences to investigate the changes of MC during 19 days.Our results showed that the changes of MC concentration under the three treatments were consistent,which increased during 1-13 d and decreased with different margins.The average concentration of MC in control was 1.69μg·L-1,which is significantly lower(P<0.05)than those in the intermittent(1.81μg·L-1)and continuous disturbance group(1.86μg·L-1).The differences of MC concentration between the two disturbance groups were not statistically significant.During1-7 d,the contents of MC per unit decreased in all the three treatments,with no significant differences among them(P>0.05).During 10-19 d,the contents of MC per unit in all treatments increased and then decreased,with significant differences among groups(P<0.05).The average contents of MC per unit in control,intermittent and continuous disturbance groups were0.55,1.20 and 1.98μg·108 cells-1,respectively.Under this experiment condition,the concentration of MC was significantly negatively correlated with nitrogen and phosphorus,and positively correlated with water temperature,SS and Chla.Our results indicated that hydrodynamic disturbance could increase the MC concentration and MC content per unit in lake waters.
作者
张宏亮
解孟平
田伟
汤祥明
ZHANG Hongliang;XIE Meng-ping;TIAN Wei;TANG Xiang-ming(School of Resource Environment and Tourism,Anyang Normal University,Anyang 455000,Henan,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;School of Environmental Science and Engineerings Anhui Normal University,Wuhu 241003,Anhui,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第3期909-919,共11页
Chinese Journal of Ecology
基金
中国科学院前沿科学重点研究项目(QYZDJ-SSW-DQC008)
江苏省水利科技项目(2018001-2)
中国科学院南京地理与湖泊研究所“一三五”项目(NIGLAS2017GH05)
“科创计划”(20184001638)资助。
关键词
富营养化
微囊藻毒素
扰动
营养盐
太湖
eutrophication
microcystin
disturbance
nutrient
Lake Taihu
