Zhang,L., song,C., Zheng,X., Wang,D. and Wang,Y.(2007): Effects of nitrogen on the ecosystem respiration, CH4 and N2O emissions to the atmosphere from the freshwater marshes in northeast China. Environ. Geol., 52, 529-539.

『中国北東部の淡水湿地から大気への生態系呼吸およびCH4とN2O放出における窒素の影響』

『Abstract
　Freshwater marshes could be a source of greenhouse gases emission because they contain large amounts of soil carbon and nitrogen. These emissions are strongly influenced by exogenous nitrogen. We investigate the effects of exogenous nitrogen on ecosystem respiration (CO2), CH4 and N2O emissions from freshwater marshes in situ in the Sanjiang Plain Northeast of China during the growing seasons of 2004 and 2005, using a field fertilizer experiment and the static opaque chamber/GC techniques. The results show that there were no significant differences in patterns of seasonal variations of CO2 and CH4 among the fertilizer and non-fertilizer treatments, but the seasonal patterns of N2O emission were significantly influenced by the exogenous nitrogen. Seasonal averages of the CO2 flux from non-fertilizer and fertilizer were 987.74 and 1,344.35 mg m-2 h-1, respectively, in 2004, and 898.59 and 2,154.17 mg m-2 h-1, respectively, in 2005. And the CH4 from the control and fertilizer treatments were 6.05 and 13.56 mg m-2 h-1 and 0.72 and 1.66 mg m-2 h-1, respectively, in 2004 and 2005. The difference of N2O flux between the fertilizer and non-fertilizer treatments is also significant either in 2004 and 2005. On the time scale of 20-, 100-, and 500-year periods, the integrated global warming potential (GWP) of CO2 + CH4 + N2O released during the two growing seasons for the treatment of fertilizer was 97, 94 and 89％, respectively, higher than that for the control, which suggested that the nitrogen fertilizer can enhance the GWP of the CH4 and N2O either in long time or short time scale.

Keywords: Exogenous nitrogen; Freshwater marshes; Ecosystem respiration; CH4; N2O emissions; GWP』

Introduction
Materials and methods
　Study site and field work
　Sample collection and analysis
　Statistical analysis
Results
　Deyeucia angustifolia aboveground biomass
　Seasonal variation and effects of exogenous nitrogen on ecosystem respiration (CO2 release)
　Seasonal variation of CH4 emission and response to the exogenous nitrogen
　N2O emission
Discussion
　Effect of exogenous nitrogen on greenhouse gases
　Exogenous nitrogen on the (global warming potential) GWP of the CO2, CH4 and N2O
Conclusion
Acknowledgments
References

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