摘要
在实验室内对颗石藻Emiliania huxleyi NIWA1108进行了受控连续模拟培养实验,共设置4个CO2分压及氮浓度处理组:p(CO2)400μatm,氮充足;p(CO2)800μatm,氮充足;p(CO2)400μatm,氮限制;p(CO2)800μatm,氮限制.实验结果显示:氮限制大大减小了颗石球的体积,降低了细胞颗粒有机氮、细胞颗粒有机磷、胞外颗粒无机碳含量,CO2浓度升高进一步降低了细胞各元素含量,尤其是颗粒无机碳含量;高二氧化碳分压或氮限制条件下颗石藻颗粒无机碳相对于有机碳的比值均有所降低,而在高二氧化碳分压和氮限制同时作用下,该比值进一步降低,并伴随着该藻沉降速率的显著降低,表明酸化和氮限制对颗石藻生理及生物地球化学指标尤其是钙化作用存在着潜在协同效应.
A laboratory continuous incubation experiment on the coccolithophore Emiliania huxleyi NIWA 1108 was conducted using a chemostat system.Four experimental treatments were studied:p(CO2)400 μatm,nitrogen-replete;p(CO2)800 μatm,nitrogen-replete;p(CO2)400 μatm,nitrogen-limited;and p(CO2)800 μatm,nitrogen-limited.The results show that nitrogen limitation greatly reduced the size of the coccosphere and decreased the content of the cellular elements. Rising p(CO2)further decreased the cellular elemental contents,especially the cellular inorganic carbon content.The ratio of inorganic particular carbon to organic particular carbon was decreased under higher p(CO2)or nitrogen limitation.In the 800 μatm p(CO2)and nitrogen-limited treatment,the ratio of inorganic particular carbon to organic particular carbon was further reduced to the lowest among the four treatments,with the lowest sinking rate.The results suggest that future ocean acidification and nitrogen limitation may have potential synergistic effects on the coccolithophore physiology and biogeochemistry.
作者
廖晏
冯媛媛
刘瑶
李文学
李敬鸿
倪红东
石文婷
LIAO Yan;FENG Yuanyuan;LIU Yao;LI Wenxue;LI Jinghong;NI Hongdong;SHI Wenting(Tianjin Key Laboratory of Marine Resources and Chemistry,College of Marine and Environmental Sciences,Tianjin University of Science & Technology,Tianjin 300457,China)
出处
《天津科技大学学报》
CAS
2019年第4期56-62,共7页
Journal of Tianjin University of Science & Technology
基金
国家自然科学基金资助项目(41306118,41676160)
关键词
颗石藻
酸化
氮限制
钙化作用
元素组成
coccolithophore
acidification
nitrogen limitation
calcification
elemental composition
