Abstract:Effects of enhanced temperature on phytoplankton recruitment and phytoplankton community succession were analyzed by a simulation experiment. Winter sediment was collected from Taihu Lake and cultured in BG-11 medium. The incubation temperatures were enhanced from 5.5℃ to 30℃ with eight gradients, and each temperature level was kept for ten days. Microscopic morphological observation was applied to analyze algal specific growth rate (SGR) and phytoplankton community succession, meanwhile fluorescence analysis was performed to detect variations of photosynthetic pigment concentration. Recruitment of Chlorophytes and Diatoms was observed at 9℃, but that of Cyanobacteria was not evidently detected until 12.5℃. Recruitment of Cyanobacteria initiated later than Chlorophytes and Diatoms, but the specific growth rate of Cyanobacteria after recruitment was highest. Phytoplankton community was overwhelmingly composed of Cyanobacteria, Chlorophytes, and Diatoms when temperature exceeded 12.5℃. Moreover, Chlorophytes dominated phytoplankton community at 12.5℃ and 16℃, Cyanobacteria subsequently established dominance above 19.5℃. Concentration of chlorophyll a increased evidently at 9℃ and 16℃, while that of phycocyanin went up markedly only at 16℃. Pigment concentration increased with the recruitment of Chlorophytes and Diatoms synchronously, but lagged behind Cyanobacteria recruitment.
谭啸, 孔繁翔, 于洋, 史小丽, 张民. 升温过程对藻类复苏和群落演替的影响[J]. 中国环境科学, 2009, 29(6): 578-582.
TAN Xiao, KONG Fan-Xiang, YU Yang, SHI Xiao-Li, ZHANG Min. Effects of enhanced temperature on algae recruitment and phytoplankton community succession. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(6): 578-582.