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

作　　者：杨茹君[1] 唐洪杰[1] 王修林[1] 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2009年第1期119-124,共6页Periodical of Ocean University of China

基　　金：国家高技术研究发展规划项目(2007AA09Z106)资助

摘　　要：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。The influence of NO3-N and PO3-P on the size and size distribution of Nitzschia closterium were studied in detail. Despite of variation in nutrient concentration, the distribution type of cell size remained unchanged during the growth process of phytoplankton, which could be well described by the Gaussian distribution function. The increase of phosphate concentration decreased the MESD for Nitzschia closterium. In contrast, the maximal MESD of cells decreased from 4.09 μm to 3.70μm when the nitrate concentration increased from 28.91 μmol/ dm^3to 41.00 μmol/dm^3but rose to 3.88 μm when the nitrate concentration increased from 41.00 μmol/dm^3 to 77.58 μmol/dm^3. The minimal MESD appeared to have the same trend, decreased from 3.50 μm to 3.09 μm as the nitrate concentration increased from 28.91/μmol/dm^3to 41.00 μmol/dm^3 and then rose to 3.63μm while the nitrate concentration increased to 77.58 μmol/dm^3. The light absorption coefficient （ε） of cells varied with a the variation of nutrient concentration and rose as the value of N ： P increased. The relationship between μmax and MESD fitted the Allometric model well, with a significant non-linear correlation coefficient of 0.85. The negative exponential relation did exist between growth rate and MESD for single species of plankton with a narrower cell size distribution. The relationcan be expressed by the following equation： μmax = 1 133 × MESD^5.61.

关 键 词：新月菱形藻 营养盐 最大生长速率 中值等效球径(MESD) 

分 类 号：X171[环境科学与工程—环境科学]