莫氏马尾藻(Sargassummcclurei)对氮和磷的吸收

采用单因子和正交实验方法,研究了温度、盐度和光照度对莫氏马尾藻(Sargassummcclurei)氮和磷吸收速率的影响。结果表明,温度、盐度和光照度对莫氏马尾藻氮吸收速率有显著影响(P0.05);莫氏马尾藻氮吸收最适温度范围在20~25℃,光照度为(60~140)mol/(m2s),盐度为20~30。温度和光照度对莫氏马尾藻磷的吸收速率有显著影响(P0.05),莫氏马尾藻对磷吸收最适温度范围30~35℃,光照度为(60~100)mol/(m2s)时;盐度对莫氏马尾藻磷吸收速率影响不显著(P0.05)。正交实验结果显示,影响莫氏马尾藻氮和磷吸收的主要因子为温度和光照度,在温度20~25℃、光照度100 mol/(m2s)和盐度30条件下,莫氏马尾藻氮和磷的吸收速率最大。结果说明通过控制栽培的深度来调节光照度,可有效地提高莫氏马尾藻对海水中氮和磷等营养盐的吸收速率。因此在亚热带海域大量栽培莫氏马尾藻能够有效地降低海水的富营养化程度。

Nitrogen and phosphorus absorption capability of Sargassummcclurei

The effects of temperature,salinity and light intensity on nitrogen and phosphorusuptake of Sargassummcclurei in laboratory by single factor and orthogonal testwere investigated.The results showed that temperature,salinity and light intensity had significantly effect on nitrogen uptake of S.mcclurei(P0.05),the most favorable nitrogen uptake conditions for S.mcclurei were:temperature,ranging from 20℃ to 25℃; illumination,ranging from 60 mol/(m2s) to 140 mol/(m2s); salinity,ranging from 20 to 30.The phosphorus uptake of S.mcclurei were significantly affected by temperature and light intensity (P0.05),but not by salinity (P0.05),the optimal temperature ranged from 30℃ to 35℃ and the optimal illumination ranged from 60 mol/(m2s) to 100 mol/(m2s).The orthogonal test indicated that,of the three factors,temperature and light intensity were the main factors to affect nitrogen and phosphorus uptake of S.mcclurei,the highest value of uptake rate appeared when temperature,light intensity and salinity were 20℃~25℃,100 mol/(m2s) and 30,respectively.Therefore,S.mcclurei can effectively absorbing nutrient (including nitrogen and phosphorus) ambient.We can regulate the ability of S.mcclurei to absorbing nitrogen and phosphorus by altering the cultivation depth to adjusting light intensity.We can effectively reduce the degree of eutrophication in subtropical seas by large-scale cultivation of S.mcclurei.