摘要
于1995年8－12月，利用单因子实验法，首次研究了混合稀土对球等鞭金藻（Isochrysis，galbana）生长繁殖的影响。结果表明，海水中稀土最佳浓度范围为1．66－6．60mg／L，细胞浓度和叶绿素含量分别提高11．6％—23．2％和1．99％－45．2％；混合稀土加入浓度高于9．9mg／L对球等鞭金藻的生长产生抑制作用。稀土对球等鞭金藻生长的促进作用与其他营养盐类浓度无关，当细胞处于指数生长期时，加入稀土效果最好。
In this paper, the effects of rare earth elements on the growth and chiorophyll syntheis of Isochrysis galbana was studied. The experimental rare earth consists of rara earth nitrate, with a Re2O3 content of>38. 7%. The method for the experiments is as follows. A proper amount of seawater and seeds of Isochrysis galbana, according to the concentration of Isochrysis galbana, was added to a 250 ml triangle flask. The experimental volume was 200 ml; the initial concentiations of the algae, 80-85(×104 cell / ml); the concentrations of nutrient salts-N P and Fe, 30,2,0.5 mg / L respectively. The rare earth was added then to the testing gromp; 5 dupicares per concentration group were tested. The experimental temperature was 23±1℃;the sourse of light 40W fluorescent lamps; the time of light and black, 10 and 14 hours per day. The triangle flasks were shaked and exchanged their locations 3-4 hmes per day. The cell concentrations of the various groups were calculated by sampling and monitetring the absorption value of the algae solution through the spectrophotometric method in which the length of determinating wave was 550 nm; A 1cm colormetric utensil was used and was taken as the reference solution seawater. The chlorophyll was determined using spectrophotometry.The results show that firstly, the cell number of the testing groups is significantly larger (P <0.05) than that of the controlled group from the fourth day and at a 1.65-6.60 mg / L concentration of the rare earth elements. The cell concentration of the testing group is talsed by 23.2% at a 4.95 mg / L concentation of the rare earth elements, compared with the controlled groug. However, rare earth elements reduce the culture of Isochrysis galbana if the concentrations are higher than 9.9 mg /L. Secondly, the cell concentration of the testing group was sighificantly larger (P < 0.05) than that of the controlled group from the 4th day, when the ratios of nutrient salts N: P: Fe in the testing groups were 30:2:0.5 mg / L, 15: 1:0.25 mg / L, 10:0.67:0.17 mg / L
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1998年第5期552-557,共6页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!39370548
关键词
稀土
球等鞭金藻
叶绿素
生长影响
Rare earth elements Isochrysis galbana chlorophyll
