苦草根系对硝氮和氨氮的吸收

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Abstract

Nitrate(NO₃^--N) and ammonium(NH₄⁺-N) are the main forms of biological available nitrogen source in the sediment pore water of lakes.In this paper,using stable isotope 15N tracer technique and simulation experiments,we studied the uptake of NH₄⁺-N and NO₃^--N by roots of Vallisneria natans respectively,and their relationships with the concentration of nitrogen.The results showed that the uptake of NH₄⁺-N was significantly higher than that of NO₃^--N.Nitrogen was transferred to shoot after it was absorbed,and the transfer rate of NO₃^--N was relatively high.The concentrations of NH₄⁺-N affected the uptake of NO₃^--N significantly.When the concentration of NH₄⁺-N was less than 0.072 mmol/L,the uptake of NO₃^--N increased with the increase of NH₄⁺-N,then decreased and then maintained a steady state.The effect of NO₃^--N on the uptake of NH₄⁺-N by the roots had a similar pattern.

Key words： Vallisneria natans root stable isotope ammonium

Received: 25 June 2012

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	XU Sheng
	LI Xin
	ZHONG Ping
	LIU Zheng-wen

Cite this article:

XU Sheng,LI Xin,ZHONG Ping, et al. The uptake of nitrate and ammonium by the root of Vallisneria natans[J]. , 2012, 31(3): 312-317.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2012/V31/I3/312

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