Photosynthetic rates of Antarctic sea-ice algae

From the abstract of one of the papers: Oxygen microelectrodes were used to measure the photosynthetic rates of Antarctic fast ice algal mats. Using the oxygen flux across the diffusive boundary layer below the fast ice at Davis, a productivity range of 0-1.78mg C per square metre per hour was measured. This is at the lower end of fast ice productivity estimates and suggests that conventional carbon 14 techniques may overestimate sea ice algal mat productivity. Photosynthetic capacity (P max) approached 0.05 mg per C.(mg chlorophyl a) per hr. Onset of photosynthesis saturation, E k, was found at about 14 micromol photons per square metre per second. The irradiance of photoinhibition onset, E inh, was about 20 micromol photons per square metre per second and the irradiance at the compensation point, E c, was 4 micromol photons per square metre per second.节选自某篇学术论文的摘要： 本研究采用氧微电极（oxygen microelectrodes）测定南极固定冰藻垫的光合速率。借助南极戴维斯站（Davis）固定冰下方扩散边界层的氧通量数据，测得该藻垫的生产力范围为0~1.78mg C·m⁻²·h⁻¹。该结果处于固定冰藻垫生产力估算值的下限区间，提示传统碳十四（carbon 14）技术可能会高估海冰藻垫的生产力。 其光合能力（最大光合速率P_max）约为0.05mg C·(mg叶绿素a（chlorophyl a）)⁻¹·h⁻¹。光合饱和起始光强E_k约为14μmol光子·m⁻²·s⁻¹；光抑制起始光强E_ih约为20μmol光子·m⁻²·s⁻¹，而光补偿点对应的光强E_c为4μmol光子·m⁻²·s⁻¹。