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| Measurement and simulation of N2O emissions from a alder and cypress mixed plantation in hilly areas of the central Sichuan Basin. |
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Abstract Soil N2O efflux in a mixed forest plantation of Alnus cremastogyne and Cupressus funebris was measured by closed chamber chromatographic technique from 2005 to 2006 in the central Sichuan Basin. Simulations of N2O emissions revealed that field observations and model predictions fitted well for seasonal patterns of both years. The simulation of mean soil N2O emission rate were 15.02mg/(m2×h) and 14.03mg/(m2×h), which accounted for 85.7% and 87.5% of field measurements in 2005 and 2006, respectively. There were no significant differences between predicted and measured N2O fluxes both in 2005 and 2006. The modeling efficiency was 0.56 and 0.51 in 2005 and 2006, respectively. The results obtained from both sensitivity analysis and validations with field data sets indicated that Forest-DNDC could be successfully used to predict N2O emissions in this forest sites. In comparison with the precipitation and air temperature in 2005, changes in precipitation by ±30% could only change the N2O fluxes by less than 25%, and changes in air temperature by ±3℃ could only change the N2O fluxes by less than 10%.
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Received: 25 September 2008
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