温度对几种大型海藻硝氮吸收及其生长的影响

Effects of temperature on nitrogen uptake and growth in several species of macroalgae

中文关键词: 真江蓠  脆江蓠  蜈蚣藻  鼠尾藻  海黍子  吸收动力学  相对生长率

英文关键词: Gracilaria asiatica  Gracilaria chouae  Grateloupia filicina  Sargassum thunbergii  Sargassum Pallidum  Uptake kinetics  Relative growth rate

中文摘要:

      以大型红藻真江蓠Gracilaria asiatica、脆江蓠Gracilaria chouae、蜈蚣藻Grateloupia filicina大型褐藻鼠尾藻Sargassum thunbergii、海黍子Sargassum pallidum为实验材料，研究了在10～25℃不同温度下这几种海藻对硝氮（NO3-N）的吸收和生长情况。结果表明，几种大型海藻对水体中NO3-N的吸收效果明显，其中真江蓠和脆江蓠的吸收速率15℃时最高，为0.507±0.136和0.448±0.095μmol/g•h，蜈蚣藻和鼠尾藻在20℃时最高，为0.614±0.033和0.289±0.019μmol/g•h，海黍子在25℃时吸收速率最高，为0.748±0.015μmol/g•h。结合去除效率常数来看，海黍子对NO3-N有更好的去除效果。温度变化对大型海藻的生长具有显著的影响，在20℃下大部分海藻相对生长速率达到最高，其中以脆江蓠最高，达到4.79%±0.45%/d。

英文摘要:

      A series of experiments were conducted to investigate the effects of nutrient supplement on nitrogen uptake and growth of macroalgae,including Gracilaria asiatica, G. chouae, Grateloupia filicina,Sargassum thunbergii, and S.pallidum. It was found that nitrate absorption of these macroalgae was obvious within certain temperature range.With the rise of temperature, the nitrite uptake rate demonstrated an increasing trend.At 15℃, G.asiatica and G.chouae exhibited a maximal uptake rate of 0.507±0.136 μmol/g•h and 0.448±0.095μmol/g•h, respectively. At 20℃, G.filicina and S.thunbergii exhibited a maximal uptake rate of 0.614±0.033μmol/g•h and 0.289±0.019μmol/g•h. At 25℃, S.pallidum exhibited a maximal uptake rate of 0.748 ±0.015μmol/g•h. These findings indicated that S. pallidum is more efficient than the other species in removing nitrogen. Temperature had a significant impact on macroalgae growth, and at 20℃,the highest growth rate in wet weight occurred in most macroalgae, especially G.chouae, reaching 4.79±0.45%/d.