天津科技大学学报2023，Vol.38Issue(6)：35-46,12.DOI:10.13364/j.issn.1672-6510.20230115
磷酸盐和硝酸盐浓度对海链藻Thalassiosira sp.沉降的影响
Effects of Phosphate and Nitrate Concentrations on the Sedimentation of the Marine Chain Alga Thalassiosira sp.
摘要
Abstract
In order to study the physiological effects of changes in nitrogen and phosphorus nutrient ratio on offshore dia-toms and their effects on diatom-associated carbon sinking,we carried out a series of semi-continuous incubation and batch culture on marine diatom Thalassiosira sp.under different nitrogen and phosphorus ratios and different nitrogen and phos-phorus concentrations,respectively.The results showed that on the one hand in semi-continuous cultures,nutrient limitation significantly reduced the intracellular chlorophyll and protein contents,increased the intracellular biogenic silica and carbo-hydrate contents,and raised the sinking rate by increasing cell density.On the other hand,in the batch culture,the lowest sinking rate was observed in the exponential growth phase.As the cell growth gradually reached the stationary stage,the sinking rate significantly increased,and reached the highest under the condition of the lowest nutrient concentration.In gen-eral,our results indicated that the sinking of Thalassiosira sp.was significantly accelerated under low N/P ratio conditions.Therefore,changes in the structure of offshore nitrogen and phosphorus nutrients will also have important impacts on phyto-plankton-related carbon sinking,which cannot be ignored in the study of the ecological effects of eutrophication.关键词
硅藻/海链藻/氮磷比/富营养化/沉降速率Key words
diatoms/Thalassiosira sp./N/P ratio/eutrophication/sinking rate分类
海洋科学引用本文复制引用
段好震,冯媛媛,吴凤霞,李童童,王雅婻,王士强..磷酸盐和硝酸盐浓度对海链藻Thalassiosira sp.沉降的影响[J].天津科技大学学报,2023,38(6):35-46,12.基金项目
国家自然科学基金面上项目(42276093,41676160,22078247) （42276093,41676160,22078247）
