摘要:
温度和盐度对细基江蓠繁枝变型(Gracilaria tenuistipitata var.liui)、孔石莼(Ulva pertusa)和蜈蚣藻(Grateloupia filicina)生长率及细基江蓠繁枝变型NH4-N吸收的影响进行了实验研究.结果表明,温度和盐度对上述3种海藻生长率及NH4-N吸收均有显著影响.3种海藻的生长适宜温度和盐度范围分别为细基江蓠繁枝变型20～30℃,15～30,孔石莼15～25℃,15～40,蜈蚣藻20～25℃,25～35;最大日特定生长率(SGR)分别为8.66%,12.28%,2.24%;N饥饿细基江蓠繁枝变型对NH4-N的吸收存在短期的快吸收.细基江蓠繁枝变型NH4-N吸收的最适温度和盐度范围分别为15～25℃,10～25.生长率及NH4-N吸收速率与温度和盐度之间分别存在以下关系:SGRG.t.=0.873(S-5.487)(T-9.007)e(-0.0708S-0.0745T);SGRU.p.=0.222(S-2.665)e-0.047S(T-9.98)e-0.00057(T-9.98)2.7;SGRG.f.=2.6×10-4(S-10.856)(T-11.704)e0.156T-3.36×10-6STe0.219T;Vupt=11.812(S-4.081)(T-9.221)e-0.1S-0.148T.
Abstract:
The effect of temperature,salinity on the growth of G.tenuistipitata var.liui,U.pertusa,G.filicina and NH4-N uptake by nitrogen-starved G.tenuistipitata var.liui is studied indoor.The results show that the maximal specific growth rate per day may reach as high as 8.66%,12.28%,2.24% at favorable temperature of 20~30℃,15~25℃,20~25℃ and salinity of 15~30,15~40,25~35 respectively.The addition of NaHCO3 (2.5 mmol/dm3) stimulated growth,suggesting an inorganic carbon limitation in static cultures.Nearly all NH4-N in the medium (60 μmol) are assimilated within 24 h at the combinations of 15℃,20℃,10 and 20,the uptake is slower at lower temperature (10℃) and higher salinity (40).The correlation models indicat that temperature and salinity are the major factors affecting growth and ammonium uptake.
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