不同营养盐浓度下新月菱形藻生长的粒径效应Size Effect on Nitzschia closterium When Exposed to Nutrients of Different Concentrations
杨茹君,唐洪杰,王修林
摘要(Abstract):
研究了不同浓度的磷酸盐(PO4-P)、硝酸盐(NO3-N)对新月菱形藻粒度分布类型和MESD的影响,分别从μmax或ε与MESD的关系2个角度研究了细胞生长过程中的粒径效应。结果表明,在生长过程中粒径分布类型没有变化,均符合Gauss分布。增大PO4-P浓度,MESD整体上呈现减小趋势;随NO3-N浓度增加,MESD表现出先降低后增大的趋势。最大生长速率随细胞中值粒径的增大而降低,μmax与MESD的关系符合Allometric函数模型:μmax=1 133*MESD-5.61(非线性拟合相关系数R2为0.85)。吸光系数ε与溶液中的N∶P存在指数正相关关系;细胞即时吸光系数与MESD呈现波动下降的关系,ε最大值出现在3.5~3.7μm粒径范围内。
关键词(KeyWords): 新月菱形藻;营养盐;最大生长速率;中值等效球径(MESD)
基金项目(Foundation): 国家高技术研究发展规划项目(2007AA09Z106)资助
作者(Author): 杨茹君,唐洪杰,王修林
DOI: 10.16441/j.cnki.hdxb.2009.01.021
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