大型海藻对氮磷吸收能力的初步研究

实验选取了经济价值较高、生态特征较为明显且研究较为深入的三种大型海藻:海带(Laminaria japonica Aresch)、鼠尾藻(Sargassum thunbergii)和龙须菜(Gracilaria lemaneiformis)作为实验材料,在模拟自然环境条件(14℃、1500lx)和适宜的氮、磷浓度(50μmol/L、5μmol/L)下,研究其在72h内对氮、磷的吸收能力。实验数据测得,海带、鼠尾藻和龙须菜对氨氮吸收速率分别为0.397μmol/g·h、0.317μmol/g·h和0.300μmol/g·h,吸收效率为66.3%、53.6%和51.2%;对磷的吸收速率分别为0.036μmol/g·h、0.030μmol/g·h和0.033μmol/g·h,吸收效率为65.2%、55.7%和58.8%。结果表明,三种海藻对氮、磷均有明显的吸收效果,吸收能力顺序为:海带>龙须菜>鼠尾藻。

Preliminary studies on the nitrogen and phosphorus absorption capability of seaweeds

This article has selected three more in--depth study on the ecological characteristics seaweed of high economic value：Laminaria japonica Aresc.h , thunbergii , Gracilaria lemanei formis, Study on their absorptive capacity of nitrogen and phosphorus in 72h under the natural environment （14℃, 1500 lx ） and appropriate concentrations of nitrogen and phosphorusin （50μmol/L, 5μmol/L）. The experiment measured, Larninaria japonica Aresch, Sargassum thunbergii , Gracilaria lemanei f or- mis＇s absorption rate of ammonia nitrogen is 0. 397 μmol/g . h 0. 317μmol/g . h and 0. 300 μmol/g . h . Their removal ratio of ammonia nitrogen in the cultivation water is 66.3% 53.6% and 51.2% . The absorption rate of phosphorus is 0. 036 /μmol/g . h, 0.030μmol/g . h and 0. 033μmol/g . h, the re- moval ratio of phosphorusin is 65.2%, 55.7% and 58.8%. Experimental results show that the three kinds of seaweed have typically absorbtion of nitrogen and phosphorus. Absorptive capacity order is Laminaria japonica Aresch 〉Gracilaria lemanei formis 〉 Sargassum thunbergii.