不同氮、磷质量浓度下四尾栅藻的生长研究
Ecology and Environmental Sciences(2010)
Abstract
在不同氮(N)、磷(P)初始质量浓度的培养液中对四尾栅藻(Scenedesmus quadricauda)进行培养。利用Monod方程分别计算四尾栅藻对总氮、总磷的半饱和常数(Ks)。结果表明:当氮质量浓度大于4.0 mg.L-1,磷质量浓度大于0.20 mg.L-1时能满足四尾栅藻的正常生长。四尾栅藻最适生长的氮质量浓度范围为16.0~32.0 mg.L-1,磷质量浓度范围为2.0~5.40 mg.L-1。以磷为限制底物时的半饱和常数KsP远远小于以氮为限制底物时的半饱和常数KsN(KsN>KsP),说明四尾栅藻对磷的亲和性高于氮。与四尾栅藻最大现存量(X)呈高度线性相关时的总氮质量浓度范围为0.50~32.0 mg.L-1,总磷质量浓度范围为0.02~1.0 mg.L-1。四尾栅藻特定增长率(μ)连续增加的总氮质量浓度范围为0.50~4.0 mg.L-1,总磷质量浓度范围为0.02~0.20 mg.L-1。
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Key words
Scenedesmus quadricauda,phosphorus,growth,nitrogen
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