摘要
在实验室条件下,研究了温度(10、15、20、25℃)和光照强度(20、60、100、140、180μE.m-2.s-1)对鼠尾藻生长和生化组成的影响.结果表明,温度、光照强度及两者的交互作用对鼠尾藻生长均具有极显著影响.鼠尾藻在15℃和20℃下生长速率较高,随着温度的升高,达到最大生长速率所需要的光照强度有上升趋势.在10℃和15℃下,较高的光照强度对鼠尾藻生长产生了一定抑制作用,而在20℃和25℃下,其生长速率总体随光照强度的增加而增加.温度和光照强度对鼠尾藻叶绿素a、墨角藻黄素的含量影响极显著,其中光照强度的影响大于温度.总体上,叶绿素a和墨角藻黄素的含量均随着光照强度的升高而显著下降,随着温度的升高而升高.鼠尾藻碳水化合物含量随着光照强度的升高而显著升高,而温度对碳水化合物含量影响不显著.鼠尾藻蛋白质含量随着光照强度的增加而显著下降,在10℃和15℃下含量较高,随着温度的继续升高,蛋白质含量呈下降趋势.光照强度和温度的变化可改变鼠尾藻的藻体成分含量,这种改变可能是鼠尾藻为了适应环境因子改变而做出的积极的生理调节,对其生长和生存具有重要的生态意义.
A two-factorial experiment was designed to study the effects of temperature （10, 15, 20, and 25 ℃） and light intensity （20, 60, 100, 140, and 180 p μE · m-2 · s^-1） on the growth and biochemical composition of Sargassum thunbergii. The results showed that temperature, light intensity, and their interactions had significant effects on the growth of S. thunbergii. A higher growth rate of S. thunbergii was observed at 15℃-20 ℃, and, with the increase of temperature, the light intensity for the maximum growth rate of S. thunbergii had an increasing trend. At 10 ℃ and 15℃, higher light intensity had definite inhibition effect on the growth of S. thunbergii; while at 20 ℃ and 25 ℃, the growth rate was generally increased with increasing light intensity. Both temperature and light intensity had significant effects on the chlorophyll a and fucoxanthin contents of S. thunbergii, and the effects of light intensity was greater than those of temperature. In general, the chlorophyll a and fucoxanthin contents of S. thunbergii decreased significantly with increasing light intensity but increased with increasing temperature. The carbohydrate content of S. thunbergii increased with increasing light intensity, while no significant difference was observed at different temperature. The protein content of S. thunbergii decreased with increasing light intensity, and was higher at 10℃ and 15 ℃ but tented to decrease with increasing temperature. The variation Of light intensity and temperature induced the changes in the biochemical composition of S. thunbergii, and these changes could be an active physiological adjustment for the adaptation to the variation of environmental factors, which was of ecological significance to the growth and survival of S.thunbergii.
出处
《应用生态学报》
CAS
CSCD
北大核心
2009年第1期185-189,共5页
Chinese Journal of Applied Ecology
基金
国家“十一五”科技支撑计划项目(2006BAD09A01)
国家高技术研究发展计划资助项目(2006AA10Z409)
关键词
鼠尾藻
温度
光照强度
生长
生化组成
Sargassum thunbergii
temperature
light intensity
growth
biochemical composition.
