多花黑麦草对不同形态氮的吸收动力学特征研究

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摘要

采用改进常规耗竭法,比较研究了多花黑麦草(Lolium multiflorum Lam.)对NH₄⁺和NO₃^-吸收动力学特征。结果表明多花黑麦草对NH₄⁺和NO₃^-吸收符合Miehaelis-Menten方程,它对NH₄⁺的亲和力显著大于对NO₃^-的亲和力,但对NH₄⁺和NO₃^-的最大吸收速率差异不显著,说明多花黑麦草偏爱吸收NH₄⁺,在实际污水净化过程中,多花黑麦草具有优先吸收NH₄⁺的趋势,若有足够的停留时间,其对NH₄⁺净化程度会更高些;当吸收系统微生物受抑制时,多花黑麦草对NO₃^-的吸收速率明显降低,亲和力明显提高,可见微生物对吸收体系中氮素的去除有一定促进作用。

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	谢丽凤
	陆开宏
	胡智勇
	张克鑫
	刘夏松

关键词 ：多花黑麦草, 铵态氮, 硝态氮, 吸收动力学

Abstract：

The ammonium and nitrate uptake kinetics of Lolium multiflorum Lam. were investigated using the modified depletion method. The kinetic characteristics of ammonium and nitrate uptake by L. multiflorum Lam. could be illustrated with the Michaelis-Menten equation. The maximum uptake rate (V_max) and Michaelis-Menten constant (K_m) were estimated by iterative curve fitting. The K_m for NO₃^-was significantly higher than that for NH₄⁺ in L. multiflorum Lam., which showed that L. multiflorum Lam. preferred NH₄⁺. If hydraulic retention time is long enough, the purifying effect of ammonium by L. multiflorum Lam. will be better in wastewater treatment systems. When absorption system was treated with microbial inhibitors, the absorption rate and K_m of NO₃^- in L. multiflorum Lam. was significantly lower. It illuminated that microorganisms could promote the removal of nitrogen in the system.

Key words： Lolium multiflorum Lam ammonium nitrate uptake kinetics

收稿日期: 2010-06-25

X52

基金资助:863国家高技术研究发展计划资助项目(2007AA10Z409)

引用本文:

谢丽凤, 陆开宏*, 胡智勇, 张克鑫, 刘夏松. 多花黑麦草对不同形态氮的吸收动力学特征研究[J]. , 2010, 29(3): 229-233.
XIE Li-feng, LU Kai-hong, HU Zhi-yong, ZHANG Ke-xin, LIU Xia-song . Study on the uptake kinetics of ammonium and nitrate In Lolium multiflorum Lam.. , 2010, 29(3): 229-233.

链接本文:

http://www.ecolsci.com/CN/Y2010/V29/I3/229

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