巢湖水华蓝藻原位生长率的时空变化及其环境影响因子  

Spatial-temporal variations of the in-situ growth rate of bloom-forming cyanobacteria and their environmental factors in Lake Chaohu,China

作　　者：阳振[1] 史小丽[1] 陈开宁[1] 张民[1] Yang Zhen;Shi Xiaoli;Chen Kaining;Zhang Min(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China)

机构地区：[1]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

出　　处：《湖泊科学》2021年第4期1043-1050,共8页Journal of Lake Sciences

基　　金：国家水体污染控制与治理科技重大专项(2018ZX07208-004);国家自然科学基金项目(31971476,31570457);中国科学院南京地理与湖泊研究所“一三五”项目(NIGLAS2018GH01)联合资助.

摘　　要：原位生长率是研究藻类生长、衰亡、种群演变、生产力估算,以及藻类对环境变化响应的重要指标,针对水华蓝藻原位生长率的测定,目前还缺乏成熟可靠的手段.本研究利用改进的原位培养法,根据培养前后藻蓝素浓度的变化,对巢湖东、中、西3个湖区水华蓝藻的原位生长率进行周年调查.结果表明,巢湖水华蓝藻的原位生长率变化范围在-1.16-0.69 d^(-1)之间,表层的原位生长率最高,中层次之,底层大部分月份都为负值;原位生长率在空间分布上由高到低依次为西部湖区>中部湖区>东部湖区;在季节变化上,原位生长率春季(46月)相对较高,冬季(12月)相对较低.与环境因子进行相关分析后发现,原位生长率与溶解性总磷和温度正相关,这表明溶解性总磷和温度可能是影响巢湖水华蓝藻原位生长率的重要环境因子.In-situ growth rate is an important parameter for algae to study their growth,death,population variation,productivity and response to environmental changes.Currently,there is a lack of mature and accurate method to determine the in-situ growth rate of bloom-forming cyanobacteria.In this study,an improved in-situ incubation method base on the change of phycocyanin were used to investigate the annual net in-situ growth rate of bloom-forming cyanobacteria in the eastern,central and western lake areas of Lake Chaohu.The results showed that the net in-situ growth rate of bloom-forming cyanobacteria ranged from-1.16 to 0.69 d^(-1).The growth rates in the surface layer were higher than those in the middle layer,and those in the bottom layer were the lowest and negative in most months.In terms of spatial distribution,the growth rates from high to low were the eastern,central and western lake areas.The growth rates were the highest in spring(April to June)and the lowest in winter(January to February).Spearman correlation analysis showed that growth rate was positively correlated with dissolved total phosphorus(DTP)and temperature,which indicates that DTP and temperature are the key environmental factors affecting the in-situ growth rate of bloom-forming cyanobacteria in Lake Chaohu.

关 键 词：原位培养 原位生长率 营养盐 温度 藻蓝素 巢湖 

分 类 号：X524[环境科学与工程—环境工程] X173