氮磷比对湖泊富营养化模型参数敏感性的影响

运用Morris方法研究了蓝藻暴发期不同氮磷比条件下,巢湖富营养化模型中蓝藻、溶解有机碳、营养物和溶解氧的参数敏感性.结果表明:蓝藻的敏感参数随氮磷比不同有显著差异;氮缺乏情况下,蓝藻对氮转化过程相关参数较敏感;磷缺乏情况下则反之.在任何氮磷比条件下,溶解有机碳、营养物和溶解氧等非生物变量都是对直接参与其自身转化过程的...

Effect of nitrogen to phosphorus ratio on parameter sensitivity of lake eutrophication model

The Morris method was used to study the sensitivity parameter of cyanobacteria, dissolved organic carbon, nutrients and dissolved oxygen in Chaohu Lake eutrophication model under different nitrogen to phosphorus ratios during the cyanobacteria blooms. As results shown, sensitivity parameters of cyanobacteria were significance different with the ratio of nitrogen to phosphorus. In the case of nitrogen deficiency, cyanobacteria were more sensitive to the parameters of the nitrogen conversion process, and the converse was true in the case of phosphorus deficiency. Under different ratios of nitrogen to phosphorus, non-biological variables such as dissolved organic carbon, nutrients, and dissolved oxygen were more sensitive to the parameters directly related to their own transformation process. Parameters related to the metabolism of cyanobacteria had a greater influence on all variables than that of the growth process. In addition, there was a significant positive correlation between the sensitivity of the parameters that were tested and the strength of the interaction. This was especially true in the case of extreme nitrogen or phosphorus deficiency. These results would be helpful for understanding lake eutrophication and improve the simulation effect and accuracy of eutrophication models.