Abstract:The changes of nitrogen in water, sediment and submerged macrophytes (Vallisneria natans (Lour.) Hara) as well as its migration and transformation in the life cycle of V. natans were studied. The results indicated that the total nitrogen content was reducing continuously in V. natans and control treatments during the research stage, and the removing rate of total nitrogen in V. natans treatments was obviously higher than that in control treatments. The content of TN、NH4+-N、NO3--N in the water-sediment-submerged macrophytes system decreased by 41.68%, 81.96% , 93.34%, and the removal rates increased by 11.39%, 31.90, 0.28% than that in control treatment, respectively. In this system, the content of TN, NH4+-N, NO3--N in sediment decreased by 43.45%, 87.41%, 96.50%, and the removal rates are increased 13.78%, 37.26%, 1.68% than that in control treatment, respectively. V. natans contributed to nitrogen nutrients release in the sediment. The sediment microorganisms activity and the amount of nitrogen cycling bacteria were improved significantly. Therefore, the nitrogen cycle speed would be accelerated. The direction of transfer and transformation of nitrogen would be changed in the different stage of life cycle of V. natans. Compared with other stages, the nitrogen content in experiment group with V. natans decreased most during July to October of 2012. To October, the nitrogen content in water reached a minimum value.
孔祥龙, 叶春, 李春华, 张来甲, 李永峰. 苦草对水-底泥-沉水植物系统中氮素迁移转化的影响[J]. 中国环境科学, 2015, 35(2): 539-549.
KONG Xiang-Long, YE Chun, LI Chun-Hua, ZHANG Lai-Jia, LI Yong-Feng. Effect on nitrogen transfer and migration by Vallisneria natans (Lour.) Hara in water-sediment-submerged macrophytes system. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(2): 539-549.