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南亚热带磷限制水库中浮游植物群落对氮磷比变化的响应
潘静云1, 杨阳2, 韩博平1
1.暨南大学水生生物研究所, 广州 510632;2.贵州师范大学生命科学学院, 贵阳 550025
摘要:  为了解P限制水体中浮游植物群落对N、P营养盐的响应,通过添加N、P营养盐设置N/P梯度,对广东省流溪河水库中的浮游植物群落进行了研究。结果表明,添加N、P显著促进浮游植物的生长,浮游植物群落受P盐的影响比N盐显著;藻类的种属特异性导致浮游植物群落对氮磷营养盐的响应不一致,浮游植物总丰度与N/P比值不相关,其中隐球藻(Aphanocapsa sp.)、拟柱胞藻(Cylindrospermopsis raciborskii)和假鱼腥藻(Pseudanabaena sp.)等蓝藻适合在高N高P条件下生长,双对栅藻(Scenedesmus bijuga)等绿藻优势种偏好中N高P环境,而曲壳藻(Achnanthes sp.)、小环藻(Cyclotella sp.)等硅藻在低N低P的环境下占据优势;P浓度为0.8~2.0 μmol/L时存在诱导浮游植物碱性磷酸酶活性的阈值,当P浓度大于2.0 μmol/L时则抑制酶活性;P浓度为2.0 μmol/L可能是浮游植物维持生长的最适浓度,浮游植物N/P维持动态平衡;藻细胞N/P、C/P与水体P浓度、N/P呈显著正相关,而藻细胞C/N受N影响更明显(P<0.05)。这为热带亚热带水库的水质管理提供了理论参考。
关键词:  浮游植物群落  氮磷比  碱性磷酸酶    元素
DOI:10.11926/jtsb.4250
分类号:
基金项目:国家自然科学基金项目(31700399);贵州省科技计划项目([2020]1Y072);贵州省高层次留学人才创新创业择优项目[(2020)09]资助
Responses of Phytoplankton Communities to N/P Ratio Changes in Phosphorus-limited Subtropical Reservoir in Southern China
PAN Jing-yun1, YANY Yang2, HAN Bo-ping1
1.Institute of Hydrobiology, Jinan University, Guangzhou 510632, China;2.College of Life Science, Guizhou Normal University, Guiyang 550025, China
Abstract:  In order to understand the response of phytoplankton community in P-restricted water from Liuxihe Reservoir in Guangdong Province to different N/P ratios, the structure of phytoplankton community was studied by adding N and P to create a gradient of N/P. The results showed that the growth of phytoplankton had been promoted significantly with the addition of N and P, and the effects of P was greater than that of N. The species specificity of phytoplankton led to the inconsistent response of phytoplankton community to nitrogen and phosphorus nutrients, phytoplankton abundance was not correlated with N/P ratio. Cyanobacteria, such as Aphanocapsa sp., Cylindrospermopsis raciborskii and Pseudanabaena sp., was more favored in conditions with high level of N and P. Dominant species of green algae, Scenedesmus bijuga preferred medium N and high P. Bacillariophyceae, such as Achnanthes sp. and Cyclotella sp. had advantages in environment with low N and low P. The threshold of P concentration for alkaline phosphatase activity (APA) ranged from 0.8 to 2.0 μmol/L. When P concentration was above 2.0 μmol/L, APA was inhibited, and the optimal P concentration for phytoplankton to maintain growth may be around 2.0 μmol/L, and the ratio of cellular N/P reached equilibrium. The cellular N/P and C/P were significantly positively correlated with supplied P concentration and supplied N/P ratio, while cellular C/N was more correlated with supplied N (P<0.05). So, these would provide a theoretical reference for water quality management in tropical and subtropical reservoirs.
Key words:  Phytoplankton community  N/P ratio  Alkaline phosphatase  Phytoplankton  Element

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