中肋骨条藻和新月菱形藻对营养盐的吸收速率及环境因素影响的研究

A STUDY ON THE UPTAKE RATE OF THE NUTRIENTS BY SKELETONEMA COSTATUM AND NITZSCHIA CLOSTERIUM AND THE ENVIRONMENTAL EFFECTS

于1995年3月—1996年1月，通过实验室模拟培养，研究了中肋骨条藻和新月菱形藻对磷酸盐和硝酸盐的吸收速率，以及温度、光照等环境因素对新月菱形藻吸收磷酸盐的影响。结果表明，用Michaelis－Menton方程处理，求得中肋骨条藻和新月菱形藻吸收磷酸盐的半饱和常数分别为0．61μmol／L和0．48μmol／L，吸收硝酸盐的半饱和常数分别为7．8μmol／L和6．0μmol／L。新月菱形藻对磷酸盐的吸收速率较高，而中肋骨条藻对硝酸盐的吸收速率较高。温度和光照影响营养盐吸收速率及有关动力学参数。新月菱形藻吸收磷酸盐的速率和半饱和常数随温度的降低而降低。在1000－3000lX的光照范围内，新月菱形藻对磷酸盐的吸收速率和半饱和常数基本一致；无光时，吸收速率和半饱和常数降低。

The uptake rates of phosphate and nitrate by Skeletonema costatum and Nitzschia closterium were studied in ha, 1995-Jan., 1996. The effects of tempeat and light on the uPtake parameters of phosphate by Nitzschia closterium were also studied in thes paper. The data of the experiments were processed using the Michaelis-Menton equation. The half-saturation consat for the uptake of phosphate by Skeletonema costatum and Mitzschia closterium are 0.61 and 0.48μmol/ L, respectively- Those for the uptake of nitrate by the two species are 7.8 and 6.0μmol/Lrespectively. The uptake rate of phosphate by Nitzschia closterium is higher than that of phosphate by Skeletonema costatum, and the uptake rate of nitrate by Skeletonema costatum are higher than tha of phosphate by Nitzschia closterium Undr the same culthe condition.The uptake ratos of phosphate by Mtzschia closterium are also influenced by the condition of light and tomperature. The uptak at and the half-saturation constants decrease with the temperabe of the culthe medium decreasing; they are similar when the light chanes from 1000-3 000 lx,and decrease when no light. Th effects of the phosphate concentration of the culthe medium on the uptake ats are the sam as the sihation under the condition of light or temperature lindtation.