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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (2): 375-380.doi: 10.3724/SP.J.1006.2009.00375

• RESEARCH NOTES • Previous Articles    

Preliminary Study on the Exchange of Gaseous Nitrogenous Compounds in Phyllosphere of Oryza sativa L. at Flowering and Seed Setting Stages

XU Sheng-Guang1,2,CHEN Neng-Chang1,*,WU Qi-Tang, ZHOU Jian-Min1, LIU Xiao-Lin3, BI De1,LU Wei-Sheng2   

  1. 1Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou 510650,China;2College of Natural Resource and Environmental Sciences, South China Agricultural University,Guangzhou 510642,Guangdong;3Yichun University, Yichun 336000,China
  • Received:2008-01-18 Revised:2008-09-05 Online:2009-02-12 Published:2008-12-12
  • Contact: CHEN Nong-Chang


The exchange of gaseous nitrogenous compounds (NH3, N2O, NO, and NO2) in phyllosphere of rice (Oryza sativa L.) at the flowering and seed setting stages was measured conducted with growth chamber and greenhouse. The results showed as follows: (1) There was no significant emission of NH3 from rice leaves under the favorable illumination in growth chamber during the daytime. (2) There was the obvious uptake of NO by rice leaves; the mean exchange rate of NO in rice phyllosphere was -7.42 µg pot-1 h-1 from 15:00 pm to 18:00 pm and -4.012 µg pot-1 h-1 from 20:00 to 23:00 at night. Further more, there was the significant difference of NO content in air flux deflated from chamber between the treatments with and without rice plant (P<0.05), showing the obvious net NO absorption of rice leaves from the ambient air. As a result, the mean exchange rate of NO was significantly increased accordingly with the increasing of NO content in ambient air. (3) NO2 was also obviously uptakedby rice plant, and the net absorption rates of NO2 in rice phyllosphere were only about 5.6 % of net NO uptake in the day and about 3.9% of net NO uptake at night, respectively. (4) N2O emission from leaves was inhibited evidently by long time of appropriate illumination (10 h, 165 µmol m-2 s-1) in growth chamber with light density regulated or in greenhouse without regulated light during daytime, but, there was obvious N2O emission in rice phyllosphere under the weak light from 19:00 to 9:00 of next day without the control of light in greenhouse, with the mean exchange rate of 5.04 µg pot-1 h-1. However, with long time of appropriate light illumination, the net N2O uptake was not occurred significantly in the course of N2O exchange between rice plant and ambient air. It can be seen from the experimental results that one NO was the main one uptaked by rice leaves from air, and N2O was the main one in gaseous nitrogenous compounds, released from leaves at the rice flowering and seed setting stages.

Key words: Oryza sativa L., Phyllosphere, Gaseous nitrogen compounds, Volatilization, Uptake, Nitrogen losses

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