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引用本文:钟爱文,曹特,张萌,倪乐意,谢平.光照和黑暗条件下苦草(Vallisneria natans)和穗花狐尾藻(Myriophyllum spicatum)对铵态氮的吸收.湖泊科学,2013,25(2):289-294. DOI:10.18307/2013.0217
ZHONG Aiwen,CAO Te,ZHANG Meng,NI Leyi,XIE Ping.Uptake of ammonium by Vallisneria natans and Myriophyllum spicatum under light and dark regimes. J. Lake Sci.2013,25(2):289-294. DOI:10.18307/2013.0217
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光照和黑暗条件下苦草(Vallisneria natans)和穗花狐尾藻(Myriophyllum spicatum)对铵态氮的吸收
钟爱文1,2, 曹特1, 张萌1,3, 倪乐意1, 谢平1
1.中国科学院水生生物研究所淡水生态与生物技术国家重点实验室, 武汉 430072;2.中国科学院大学, 北京 100049;3.江西省环境保护科学研究院, 南昌 330029
摘要:
在室内模拟实验中,研究了光照(50μmol/(m2·s))和黑暗条件下苦草(Vallisneria natans)和穗花狐尾藻(Myrio-phyllum spicatum)对铵态氮(NH4+-N)的吸收速率与去除效果.结果表明,随着外源铵态氮浓度(0,0.01,0.1,1和10 mg/LNH4+-N)的增加,苦草和穗花狐尾藻对铵态氮的吸收速率都是先增加后又逐渐降低,在外源铵态氮浓度为1 mg/L时吸收速率达到最大.同种植物在光照条件下对铵态氮的吸收率不低于黑暗条件下的吸收率;相同光强条件下穗花狐尾藻对铵态氮的吸收率不低于苦草的吸收率.在黑暗条件下,在外源铵态氮浓度为1 mg/L时,穗花狐尾藻对铵的吸收速率是苦草的2.42倍;在光照条件下,在外源铵态氮浓度为1和10 mg/L时,穗花狐尾藻对铵态氮的吸收速率分别是苦草的2.47和1.79倍.因此,在富营养湖泊治理过程中,在沉水植物可耐受铵态氮浓度范围内,可以优先考虑把穗花狐尾藻作为植物修复的先锋物种.
关键词:  苦草  穗花狐尾藻  光强  铵态氮  吸收速率
DOI:10.18307/2013.0217
分类号:
基金项目:国家水体污染控制与治理科技重大专项项目(2012ZX07105-004)资助
Uptake of ammonium by Vallisneria natans and Myriophyllum spicatum under light and dark regimes
ZHONG Aiwen1,2, CAO Te1, ZHANG Meng1,3, NI Leyi1, XIE Ping1
1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P.R.China;2.University of Chinese Academy of Sciences, Beijing 100049, P.R.China;3.Jiangxi Academy of Environmental Sciences, Nanchang 330029, P.R.China
Abstract:
The uptakes and removal effects of ammonium nitrogen (NH4+-N) by Vallisneria natans and Myriophyllum spicatum under light (50 μmol/(m2·s)) and dark regimes were investigated in a laboratory experiment,with external NH4+-N concentrations at 0,0.01,0.1,1 and 10 mg/L.The results showed that the absorption rates of NH4+-N by V.natans and M.spicatum increased with external NH4+-N concentrations and peaked at 1 mg/L,and then decreased at 10 mg/L.The absorption rates of NH4+-N by the same plant species in the light condition was not less than those in the dark condition.The absorption rate of NH4+-N by M.spicatum was not less than that by V.natans in the same light regime.Under dark regimes,with external NH4+-N concentrations at 1 mg/L,the absorption rates of NH4+-N by M.spicatum was 2.42-fold higher than that of V.natans.Under light regimes,with external NH4+-N concentrations at 1 and 10 mg/L,the absorption rates of NH4+-N by M.spicatum was 2.47-fold and 1.79-fold higher than that of V.natans,respectively.Therefore,at a certain range of NH4+-N concentrations that macrophytes can tolerate, M.spicatum should be considered as the pioneer species for the restoration of macrophytes in eutrophic lakes.
Key words:  Vallisneria natans  Myriophyllum spicatum  light regimes  ammonium nitrogen  uptake rate
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