Pedosphere 10(3): 207--212, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Comparison of urea-derived N2O emission from soil and soil-plant system |
| CHEN Li-Jun1, ZHOU Li-Kai1, LI RONGHUA1 and O. VAN CLEEMPUT2 |
1 Laboratory of Ecological Process of Trace Substance in Terrestrial Ecosystem, Institute of Applied Ecology, The Chinese Academy of Sciences, Shenyang 110015 (China)
2 Faculty of Agricultural and Applied Biological Sciences, University of Ghent, B-9000 Gent (Belgium) |
| ABSTRACT |
| A pot experiment with a sandy loam soil and spring wheat as test crop was conducted to compare the N2O emission from soil system with plant cut off and from soil-plant system with plant kept. The results showed that after urea fertilizer applied, the N2O emission from soil and soil-wheat system decreased exponentially with time, and its total amount was 0.34%~0.63% and 0.33%~0.58% of applied urea-N respectively, no significant difference being found between these two systems. The N2O emission had a very significant negative relationship (P = 0.01) with the biomass of wheat plant. A combined application of urease inhibitor hydroquinone and nitrification inhibitor dicyandiamide could reduce the N2O emission by 50%~83% and 46%~74%, respectively, from soil and soil-wheat system. The N2O was mainly produced and emitted from soil, and the soil biochemical regulation, i.e., applying related inhibitors into soil could effectively diminish the urea derived N2O emission. |
| Key Words: N2O emission, soil, soil-plant system, urea |
| Citation: Chen, L. J., Zhou, L. K., Li, R. H. and Van, C. 2000. Comparison of urea-derived N2O emission from soil and soil-plant system. Pedosphere. 10(3): 207-212. |
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