摘要
2017年4月,汉江流域岚河蔺河口水库突发水体泛深褐色的异常现象,在当地引发恐慌。针对此现象,从水质和藻类群落结构开展调查研究,探讨该水库水色突变的可能原因。结果显示蔺河口水库处于富营养化状态,藻类达到水华水平。藻类细胞密度以硅藻门、蓝藻门和隐藻门为主,其中硅藻门占浮游植物总细胞密度的90.4%;藻类生物量则以硅藻门、隐藻门和甲藻门为主,硅藻门占浮游植物总生物量的92%。硅藻门中,曲壳藻和针杆藻占主导地位,尤其是曲壳藻,平均占硅藻总生物量的98.2%。对于处于富营养状态的蔺河口水库而言,硅藻水华可能是引起水色异常的主要原因,而硅藻水华发生受营养盐浓度、气象和水文条件等因素协同控制。加强流域管理,降低营养盐负荷,有利于减少汉江流域水库硅藻水华发生的风险,保障南水北调中线工程供水水质安全。
In April 2017,there was been an abnormal phenomenon of the"dark brown-water"in Lin Hekou Reservoir of Lanhe River,a tributary of the Hanjiang river basin,which caused panic within local residents.The water quality and the algae community structure were investigated to explore the mechanism for the"dark brown-water"in the reservoir.It was shown that the reservoir was eutrophicated and reached a heavy extent of algae bloom,and the dominating species were Bacillariophyta,Cyanophyta and Cryptophyta,of which,Bacillariophyta accounted for 90.4%of the total phytoplankton in terms of density;with respect to biomass,Bacillariophyta,Cryptophyta and Pyrrophyta were the top three phylum,and Bacillariophyta accounted for 92%of the total phytoplankton biomass.The predominant genera of diatom were Achnanthes exigua and Synedra spp.,among which,Achnanthes exigua(98.2%)showed the highest abundance of dominance.Being eutrophic state of the Lin Hekou Reservoir,diatom blooms may be the main cause of"dark brown-water"and the diatom blooms are related to the factors of nutrient level,weather and hydrology conditions.With the aim of water safety of Central Line Project of South-to-North Water Diversion,catchment management and reduction of nutrients into reservoir are crucial for decreasing the risk of algae blooms in the channel-reservoir of Hanjiang river basin.
作者
胡恩
王文科
张振文
孙长顺
苏雅玲
HU En;WANG Wen-ke;ZHANG Zhen-wen;SUN Chang-shun;SU Ya-ling(School of Environmental Science and Engineering,Chang′an University,Xi′an 710061;Shaanxi Provincial Academy of Environmental Science,Xi′an 710061;Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《生物学杂志》
CAS
CSCD
北大核心
2020年第4期58-61,共4页
Journal of Biology
基金
陕西省博士后基金(2017BSHQYXMZZ10)。
关键词
汉江流域
蔺河口水库
水体泛深褐色
硅藻水华
影响因素
Hanjiang river basin
Lin Hekou Reservoir
dark brown water
diatom blooms
influencing factors
