摘要
进行水生植物对NH4+和NO3-吸收动力学的研究。目的在于进行水体的生态修复时,可以根据不同营养状况的富营养化水体而选择相应的养分吸收效率的水生植物。该研究中比较了3种水生植物黄花水龙(Jussiaea stipulacea Ohwi)、伊乐藻(Elodea nuttallii)、凤眼莲(Eichhornia crassipes)对于铵态氮和硝态氮吸收动力学特征。结果表明:漂浮植物黄花水龙和凤眼莲具有较大的吸收速率Vmax和Km值,因此,它们更适合作为先锋植物对污染严重的富营养化水体进行前期的修复治理,待水体水质提高到一定的程度时,再利用去污能力低的沉水植物进行对修复水体水质的维持和提高,并在此基础上可逐步建立一个较为稳定的、生物多样性的生态系统。由于沉水植物伊乐藻对铵态氮和硝态氮的吸收有较低Km值和Vmaz值,因此更适合对轻度污染的富营养化水体直接应用伊乐藻来去除养分和维持水体水质。
Nitrogen is one of the most important nutrients cause water eutrophication. NH4＋-N and NO3-N are the two major inorganic nitrogen forms in eutrophic water. Study of NH4＋ and NO3- uptake kinetics of aquatic plants can help us to select the proper aquatic macrophyte according to the status of eutrophic water. So the experiment compared uptake kinetics of NH4＋ and NO3- of three aquatic macrophytes dussiaea stipulacea Ohwi, Elodea nuttallii, Eichhornia crassipes. The results showed that dussiaea stip,dacea Ohwi and Eichhornia crassipes had higher values of Vmax and Km than Elodea nuttallii, illuminated that the two floating macrophytes were proper for pre-treatment of the seriously polluted water. Lower values of Vmax and Km of submerged macrophye can be used for improving and maintaining water quality, after water quality has been improved to a certain degree.
出处
《生态环境》
CSCD
北大核心
2008年第2期511-514,共4页
Ecology and Environmnet
基金
国家科技部中澳合作项目"退化土-水生态系统的生物修复技术新技术体系研究"([2002]168)
