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0.8~2.0μmol/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2.0μmol/L时则抑制酶活性;P浓度为2.0μmol/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。
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 2.0μmol/L.When P concentration was above 2.0μmol/L,APA was inhibited,and the optimal P concentration for phytoplankton to maintain growth may be around 2.0μmol/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.
作者
潘静云
杨阳
韩博平
PAN Jing-yun;YANY Yang;HAN Bo-ping(Institute of Hydrobiology,Jinan University,Guangzhou 510632,China;College of Life Science,Guizhou Normal University,Guiyang 550025,China)
出处
《热带亚热带植物学报》
CAS
CSCD
北大核心
2021年第1期20-30,共11页
Journal of Tropical and Subtropical Botany
基金
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。
关键词
浮游植物群落
氮磷比
碱性磷酸酶
藻
元素
Phytoplankton community
N/P ratio
Alkaline phosphatase
Phytoplankton
Element
