Photosynthetic activity of phytoplankton in Lake Gehu and Lake Luoma in spring
Photosynthetic activity of phytoplankton in Lake Gehu and Lake Luoma in spring
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DOI：
10.18307/2013.0510
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
L. Daming;Yang Zhen.;Yu Yang;Tang Shengkai;Zhang Tongqing;Zhou Gang
中科院分区：
文献类型：
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作者：
L. Daming;Yang Zhen.;Yu Yang;Tang Shengkai;Zhang Tongqing;Zhou Gang
本研究利用Phyto-PAM测定了春季葛湖和罗马湖浮游植物样品的PSII最大光化学量子产率（Fv /Fm）、PSII实际光化学效率（Φ PSII）和快速光响应曲线（RLC）。同时，用显微镜对浮游植物的细胞数量进行了计数。结果表明：葛湖蓝藻和硅藻的Fv / Fm值分别为0.36 ~ 0.52和0.27 ~ 0.53，硅藻的Fv / Fm和ΦPSII值分别为0.25 ~ 0.37和0.25 ~ 0.36，绿藻不存在光化学活力。RLC研究表明，葛湖蓝藻具有较高的光化学活力，容易形成优势种群。骆马湖绿藻和硅藻的Fv / Fm和Φ PSII值分别为0.45 ~ 0.65、0.41 ~ 0.49、0.25 ~ 0.32和0.19 ~ 0.25，蓝藻不存在光化学活力。葛湖浮游植物密度在530 × 104 ~ 4200 × 104cells / L之间，平均为2918 × 104cells / L，浮游植物群落以蓝藻、硅藻、隐藻和裸藻为主。罗马湖浮游植物密度在260 × 104 ~ 510 × 104cells / L之间变化，平均为379 × 104cells / L，浮游植物群落以硅藻和绿藻为主。通过对两湖浮游植物群落营养水平、丰度和光化学活力的比较发现，湖泊富营养化可以增加浮游植物的丰度和蓝藻的光合活性，有利于在浮游植物群落中获得优势。
In the present study,Phyto-PAM was applied to measure maximal photochemical quantum yield of PSII(Fv /Fm),actual photochemical efficiency of PSII(Φ PSII),and rapid light response curve(RLC) of phytoplankton samples collected from Lake Gehu and Lake Luoma in spring.Meanwhile,the cell numbers of phytoplankton were counted by microscopy.The results showed that values of Fv / Fm and ΦPSII of cyanobacteria in Lake Gehu varied from 0.36 to 0.52 and from 0.27 to 0.53,and Bacillariophyta,from 0.25 to 0.37 and from 0.25 to 0.36,respectively,but there was no photochemical vitality of Chlorophyta.RLC has indicated that cyanobacteria has higher photochemical vitality and are prone to form advantage populations in Lake Gehu.On the other hand,the values of Fv / Fm and Φ PSII of Chlorophyta and Bacillariophyta in Lake Luoma ranged from 0.45 to 0.65,from 0.41 to 0.49,from 0.25 to 0.32,and from 0.19 to 0.25,respectively,and no photochemical vitality were found for cyanobacteria.The density of phytoplankton in Lake Gehu ranged from 530 × 104to 4200 × 104cells / L,with an average of 2918 × 104 cells / L.Cyanophyta,Bacillariophyta,Cryptophyta and Euglenophyta were dominant in the phytoplankton community.The density of phytoplankton in Lake Luoma varied from 260 × 104to 510 × 104cells / L,with an average of 379 × 104cells / L,Bacillaryophyta and Chlorophyta were dominant in the phytoplankton community.According to the comparison between nutritional level,the abundance and photochemical vitality of phytoplankton assemblages in the two lakes,the lake eutrophication can increase the abundance of phytoplankton and photosynthetic activity of cyanobacteria,and become in favor of gaining advantages in phytoplankton assemblages.