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为探讨海藻养分吸收能力并以高效养分过滤器筛选为目标,以N饥饿和N饱和的石莼为材料,研究了3种光照及温度因子及其交互作用对不同N素营养限制状态下石莼NO3-吸收动力学特征的影响。结果表明:N饱和条件下,随着光照的增强,石莼对NO3-的最大吸收速率也增加;30℃条件下,光照强度的增加虽然使得其最大吸收速率提高,但Vmax/Km在中等光强下最大;20℃最有利于石莼对NO3-的吸收。N饥饿条件下,石莼对NO3-的吸收速率显著大于非饥饿状态。在10℃和20℃条件下,呈现与N饱和条件下相似的规律,但在30℃条件下,中等光强石莼对NO3-的最大吸收速率最高。在10℃和20℃条件下,增加光强促进石莼对NO3-的吸收,但30℃条件下光强的增加并未起到促进作用。饥饿状态下的石莼的NO3-吸收速率较高,当石莼吸收NO3-饱和时,依然可以以较低的速率继续吸收环境中的NO3-。
In order to explore the nutrient absorption capacity of seaweed and to screen the high-efficiency nutrient filter, we studied the effects of three light and temperature factors and their interactions on the effects of N starvation and N-saturated stoneworm NO3-absorption kinetics. The results showed that the maximal absorption rate of NO3- also increased with the increase of light intensity under N-saturated condition. The increase of light intensity under 30 ℃ increased the maximum absorption rate of Vmax / Km under medium light 20 ℃ is most conducive to the absorption of NO3-. N starvation conditions, the absorption rate of NO3- was significantly higher than the non-starvation state. Under the conditions of 10 ℃ and 20 ℃, the law similar to that under N-saturated condition was shown. However, the maximal absorption rate of NO3- by medium-light-intensity stone was the highest at 30 ℃. Under the condition of 10 ℃ and 20 ℃, the light intensity was increased to promote the absorption of NO3-, but the increase of light intensity at 30 ℃ did not play a promoting role. In the starvation state, the NO3-uptake rate is higher, and the NO3-uptake of the environment can still be continued at a lower rate when the NO3-saturation is absorbed by the rock goblet.