摘要
采用改进的常规耗竭法,研究了黄菖蒲(Iris pseudacorus L.)和狭叶香蒲(Typha angustifolia L.)根系对NH+4、NO-3和H2PO-4的吸收特征及差异。结果表明,这2种植物根系对NH+4、NO-3和H2PO-4的吸收动力学特征均可采用Michaelis-Menten方程描述。2种植物根系对NH+4、NO-3和H2PO-4的亲和力(K m)和最大吸收速率(V max)有显著差异。吸收H2PO-4时,黄菖蒲根系具有较高的V max值和较低的K m值,说明黄菖蒲具有嗜磷特性,并能够适应广范围浓度的H2PO-4环境,适宜用于污染水体磷的去除;吸收NO-3时,狭叶香蒲根系具有较高的V max值和较低的K m值,表明狭叶香蒲可用于广范围浓度NO-3污染的水体修复;吸收NH+4时,黄菖蒲根系具有较低的V max值和K m值,而狭叶香蒲根系具有较高的V max值和K m值,说明黄菖蒲适宜用于NH+4污染较轻水体的修复,而在NH+4污染较重水体中宜选用狭叶香蒲作为先锋植物。
The NH4 , NO3- and H2PO4- uptake kinetics of root system of Iris pseudacorus L. and Typha angustifolia L. were investigated by using the modified depletion method. Results showed that the NH4 , NO3^- and H2PO4- uptake kinetics of the two plants＇ root system could be expressed with the Michaelis-Menten equation. The Michaelis-Menten constant （Km） and the maximum uptake rate （Vmax） was significantly different between the two plants＇ root systems. The root system of Iris pseudacorus L. had higher Vmax and lower Km for H2PO4^- than that of Typha angustifolia L. ＇ root system, which suggested that Iris pseudacorus L. had the capability to adapt to a various concentrations of H2PO4 environment and made it a better candidate for removing phosphorus in polluted water. In addition, Typha angustifolia L. ＇ root system had higher Vmax and lower Km for NO3- than that of Iris pseudacorus L. ＇ root system, which indicated that Typha angustifolia L. was suitable for treatment of all levels of NO3- polluted water. The values of Vmax and gm for NH4＋ of Iris pseudacorus L. ＇ root system were lower than that of Typha angustifolia L. ＇ root system, which showed that Iris pseudacorus L. was applicable to repair the less contaminated water by NH4 and Typha angustifolia L. should be selected for NH4 seriously polluted water bodies.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第12期4638-4642,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51309197)
福建省自然科学基金资助项目(2012J05080)
福建省教育厅A类项目(JA12257)
厦门市科技计划项目资助(3502Z20110016)
关键词
黄菖蒲
狭叶香蒲
氮磷
吸收动力学
污染水体
Iris pseudacorus L.
Typha angustifolia L.
nitrogen and phosphorus
uptake kinetics
polluted water
作者简介
陈国元（1980～），男．副研究员，主要从事污染水体生态修复研究工作。E—mail：cgy1117@yahoo．com．cn
