浮萍塘中氮素形态转化模型的构建

为提高水生植物塘对氨氮的去除能力,考察生态相构成复杂的浮萍塘中氨氮、氮氧化物和有机氮在底泥、水体和水生生物间的迁移转化过程,构建包含6种N组成形态及12个反应历程的氮循环迁移模式,并通过实际工程运行数据对该模式的应用普遍性进行验证.模拟结果显示,该模型中各形态氮预测值与实际监测值之间的相关系数在0.61~0.89,模型能够有效预测浮萍塘中各形态N在水体、底泥和水生植物间的迁移转化.在该模型中,除浮萍中的氮对模型参数变化略敏感,其余各形态氮稳定性强.因而,该模型整体表现为一个稳健的系统,具有较高的预测可靠性.

Model construction of nitrogen transformation processes in a duckweed pond

In order to improve the removal efficiency of hydrophytes ponds for ammonia,a nitrogen transformation and cycling model for a duckweed pond,including 6 nitrogen species and 12 transformation processes,was developed based on the systematic investigation on the transformation processes of ammonia,NOx and organic nitrogen distributing in sediment,water bulk and hydrophytes,respectively.The availability and universality of the developed model were validated.The simulated results show that for all N species,the correlation coefficient between the predicted and the observed values ranges from 0.61 to 0.89,and the model can meet the demands for effective simulation N variations.In this model,most variables possess high stabilization with the variation of parameters.Therefore,the model is stable and can effectively predict the nitrogen transformation in a duckweed pond.