Effect of pulsed nutrient supply on the growth of a HAB diatom Skeletonema costatum
脉冲式营养盐输入对中肋骨条藻生长的影响

This study was to elucidate whether phytoplankton growth could be influenced by an environmental fluctuation such as a pulsed nutrient supply.A HAB diatom Skeletonema costatum was introduced to the model.It was shown that characteristic responses to different intervals of nutrient supply.S.costatum showed large fluctuations in cell density in response to pulses of nutrients,and the frequency of fluctuation in cell density equals the frequency of nutrient pulsed supply.The maximum of cell density of S.costatum under 1 day's nutrient pulsed is lower than cell density under 5 days' nutrient pulsed or 10 days' nutrient pulsed.And the time that gets to the max cell density under 1 days' nutrient pulsed is later than the time under 5 days' nutrient pulsed or 10 days' nutrient pulsed.Furthermore,the average uptake rate of nutrients under 10 days' nutrient pulsed is the largest among 3 different nutrient pulsed supply modes,and the average uptake rate of nutrients under 5 days' nutrient pulsed is the least among these,especially on the nitrate and silicate.