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引用本文:赵莉,雷腊梅,彭亮,韩博平.广东省镇海水库拟柱孢藻(Cylindrospermopsis raciborskii)的季节动态及驱动因子分析.湖泊科学,2017,29(1):193-199. DOI:10.18307/2017.0121
ZHAO Li,LEI Lamei,PENG Liang,HAN Boping.Seasonal dynamic and driving factors of Cylindrospermopsis raciborskii in Zhenhai Reservoir, Guangdong Province. J. Lake Sci.2017,29(1):193-199. DOI:10.18307/2017.0121
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广东省镇海水库拟柱孢藻(Cylindrospermopsis raciborskii)的季节动态及驱动因子分析
赵莉1, 雷腊梅1,2, 彭亮1,2, 韩博平1,2
1.暨南大学水生生物研究中心, 广州 510632;2.广东省水库蓝藻水华防治中心, 广州 510632
摘要:
拟柱孢藻(Cylindrospermopsis raciborskii)是热带地区普遍存在的蓝藻种类,已在广东省很多水库成为优势种类甚至形成水华,作为一种新的有害水华类型,目前对其成因研究甚少.以广东省江门市镇海水库为研究对象,于2014年11月-2015年10月期间对其进行逐月采样,观测理化因子和浮游植物组成,测定拟柱孢藻的丝体长度,初步探讨该水库拟柱孢藻优势形成的原因.数据表明,拟柱孢藻是镇海水库的绝对优势种,常年生物量较高,介于5.9~15.5 mg/L之间,平均生物量为11.3 mg/L,占浮游植物总生物量的93.5%.从季节上看,拟柱孢藻生物量在2-6月相对较高,最高生物量出现在6月,10月和11月生物量最低.拟柱孢藻的丝体长度具有显著的季节变化,与水温呈极显著负相关.相关性分析表明拟柱孢藻生物量与总氮、总磷浓度呈显著正相关,与氮磷比呈显著负相关,而逐步回归分析表明拟柱孢藻生物量的变化主要由总磷浓度决定,推测该藻对磷的超强吸收和储存能力在其生物量季节变动中起重要作用.
关键词:  拟柱孢藻  藻丝体长度  生物量  环境因子  镇海水库
DOI:10.18307/2017.0121
分类号:
基金项目:广东省科技计划项目(2013B091300015)、广东省水利科技创新项目(2016-29)和国家自然科学基金项目(41403061)联合资助.
Seasonal dynamic and driving factors of Cylindrospermopsis raciborskii in Zhenhai Reservoir, Guangdong Province
ZHAO Li1, LEI Lamei1,2, PENG Liang1,2, HAN Boping1,2
1.Institute of Hydrobiology, Jinan University, Guangzhou 510632, P. R. China;2.Guangdong Center for Control and Prevention of Reservoir Cyanobacterial Blooms, Guangzhou 510632, P. R. China
Abstract:
Cylindrospermopsis raciborskii,thought to be an originally tropical species, is found to become dominant and even formed blooms in many reservoirs of Guangdong Province. The dominance of this species presents a new threat to the region but little is known about its bloom forming mechanism. With the above reasons, the study aims to determine the factors that may lead to the successful dominance and bloom formation of C. raciborskii. The C. raciborskii filamental length, phytoplankton species composition, and different environmental physico-chemical parameters were examined monthly during the period of November 2014 and October 2015 in Zhenhai Reservoir. Our results showed that C. raciborskii dominated absolutely in the reservoir during the sampling period. Its biomass ranged from 5.9 to 15.5 mg/L, with a mean value of 11.3 mg/L, accounting for nearly 93.5% of the total phytoplankton biomass. C. raciborskii biomass was relatively high from February to June in 2015. The highest levels were recorded in June and the lowest in both October and November. Filamental length of C. raciborskii exhibited an obvious seasonal regularity. Correlation analysis shows a highly significant negative correlation between filamental length of C. raciborski and water temperature. The biomass of C. raciborskii was significant-positively correlated with total nitrogen and total phosphorus, and significant-negatively correlated with the ratio of nitrogen to phosphorus. Further analysis with continuously multiple factors analysis indicated that total phosphorus concentration was the key factor affecting C. raciborskii biomass. We speculate that the strong absorption to phosphorus and the high P-storage capacity of C. raciborskii have played an important role in the seasonal variation of biomass.
Key words:  Cylindrospermopsis raciborskii  filamental length  biomass  environmental factors  Zhenhai Reservoir
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